Trees of the World: Field Guide
The Observatory Almanac — Section 16
A comprehensive reference to 50 of the most important and commonly encountered trees across temperate, boreal, and tropical regions. Entries include identification, ecology, and human uses.
How to Use This Guide
Leaf arrangement: Alternate (one leaf per node), Opposite (two leaves per node), Whorled (three+ per node)
Bark descriptions are for mature trees — young trees may differ significantly.
PART I: DECIDUOUS BROADLEAF TREES
1. English Oak / Pedunculate Oak (Quercus robur)
Leaves: Alternate; deeply lobed with rounded lobes; small ear-like lobes (auricles) at leaf base; no stalk (sessile on twig); 7–14 cm
Bark: Deeply furrowed gray-brown in thick ridges on mature trees
Fruit/Seed: Acorns in cups on long stalks (pedunculate); 1–2.5 cm
Habitat: Deciduous woodland, hedgerows across Europe and western Asia; prefers deep loam
Uses: Timber — the foundation of European shipbuilding and medieval construction; flooring, furniture, whisky barrels; bark for leather tanning; galls used historically for ink; wildlife value unmatched — supports over 2,000 species in Britain alone
Notable Facts: Can live 1,000+ years; hollow ancient oaks are still alive; trees don't produce significant acorns until ~50 years old; the Major Oak in Sherwood Forest is over 1,000 years old
2. American White Oak (Quercus alba)
Leaves: Alternate; deeply lobed with rounded (not pointed) lobes; pale green above, whitish-gray below; turns deep red-purple in autumn
Bark: Light gray, shallowly furrowed and plated — often appears whitish
Fruit/Seed: Acorns with warty shallow cups; sweet enough for human consumption
Habitat: Eastern North American deciduous forests; well-drained upland soils
Uses: Premium lumber for furniture, flooring, wine and bourbon barrels (tight grain prevents leakage); acorns ground into flour by indigenous peoples; important wildlife mast
Notable Facts: Can live over 600 years; the Wye Oak in Maryland was 460+ years old when it fell in 2002
3. American Sugar Maple (Acer saccharum)
Leaves: Opposite; 5 lobes with pointed tips; sinuses between lobes moderately deep; iconic "maple leaf" shape; brilliant orange-scarlet-yellow autumn color
Bark: Gray-brown; older trees develop thick curling plates
Fruit/Seed: Paired samaras ("helicopter seeds") with 60–120° angle
Habitat: Eastern North American mixed forest; cool moist uplands; requires cold winters
Uses: Maple syrup and sugar production — 40 liters of sap yields ~1 liter syrup; hard maple lumber for furniture, flooring, butcher blocks, baseball bats, bowling alleys; medicinal bark preparations used by indigenous peoples
Notable Facts: Vermont's state tree; a single tree can produce 40–70 liters of sap per season; trees must be 40+ years and 25+ cm diameter before first tapping
4. European Beech (Fagus sylvatica)
Leaves: Alternate; oval-elliptic with wavy margins; silky when young; golden copper in autumn; bronze leaves sometimes retained through winter
Bark: Remarkably smooth, silver-gray — like elephant skin; retains this appearance even on very old trees
Fruit/Seed: Triangular beechnuts in spiny husks (mast), produced in mast years every 5–10 years
Habitat: Well-drained chalk and limestone soils; dominant tree of southern English downland; shades out almost all competitors
Uses: Furniture (chairs especially), kitchen tools, parquet flooring; smoked for certain continental cheeses; beechnuts edible raw or roasted but contain small amounts of toxins; mast was historically used for pig pannage
Notable Facts: The smooth bark made it the favored carving surface for graffiti since antiquity — oldest carved beech trees show 18th-century carvings; forms pure stands in parts of Europe (buchenwälder)
5. White Ash (Fraxinus americana)
Leaves: Opposite; pinnately compound with 5–9 leaflets; leaflets oval with fine serrations; turns yellow to purple-maroon in autumn
Bark: Gray with interlacing diamond-shaped ridges creating tight diamond pattern
Fruit/Seed: Single-winged samaras in hanging clusters
Habitat: Moist rich deciduous forest in eastern North America; river bottoms and lower slopes
Uses: Historically one of North America's most valued hardwoods — baseball bats, hockey sticks, tennis rackets, tool handles (excellent shock resistance); furniture; flooring
Notable Facts: Emerald Ash Borer, an invasive beetle, has killed billions of ash trees since its introduction; some species now functionally extinct across large parts of their range — one of the worst ecological disasters in North American forestry
6. Silver Birch (Betula pendula)
Leaves: Alternate; triangular-ovate with doubly serrated margin; hairless; pointed tip; turns yellow in autumn
Bark: White to silver-white with distinctive black diamond-shaped markings; peels in papery strips; dark rough furrowing on lower trunk with age
Fruit/Seed: Tiny winged nutlets in catkins that disintegrate when ripe
Habitat: Light well-drained soils; pioneer species; heathland and moorland edges across Europe and northern Asia
Uses: Birch water (sap tapped in spring) — mildly sweet drink or fermented into wine; birch bark historically used for canoe building by indigenous peoples; bark tar used as adhesive in prehistory; wood for paper pulp, furniture, plywood; traditional birch twigs for saunas
Notable Facts: Short-lived (rarely over 80 years) but vital pioneer — improves soil and shades out grasses allowing other trees to establish; northern limit of many woodlands
7. Common Alder (Alnus glutinosa)
Leaves: Alternate; rounded with notched tip (like someone took a bite); dark green and glutinous when young; serrated margin
Bark: Dark gray-brown with irregular small square plates
Fruit/Seed: Small woody catkins (like tiny cones) that persist through winter on branches
Habitat: Riverbanks, wet woodland, lakesides across Europe — classic "riparian" tree
Uses: Wood remarkably resistant to water-rot — underwater foundations of Venice were built on alder piles; historically for water pipes, mill wheels, clogs; nitrogen-fixing root nodules improve soil; charcoal for gunpowder
Notable Facts: Turns orange-red when cut (chemical oxidation); leaves don't change color before falling — a reliable autumn calendar indicator
8. American Sycamore (Platanus occidentalis)
Leaves: Alternate; large, maplelike but with coarser shallow lobes; 3–5 lobes; distinctive large stipule scar around twig
Bark: The most distinctive tree bark in North America — upper trunk and branches reveal jigsaw patches of cream, olive, brown, and gray as outer bark flakes away
Fruit/Seed: Hanging ball-shaped seed clusters on long stalks; persist through winter
Habitat: Rich moist bottomland and river floodplains in eastern North America
Uses: Interior furniture, butcher blocks, pulpwood; buttons historically (from wood); historically used for barber poles
Notable Facts: One of eastern North America's largest deciduous trees — trunk diameters of 4+ meters recorded historically; "hollow sycamore" trees have sheltered travelers and even early settlers
9. Horse Chestnut (Aesculus hippocastanum)
Leaves: Opposite; palmately compound with 5–7 leaflets radiating from central point; leaflets large, toothed, widest near tip
Bark: Dark gray-brown; scaly plates that tend to curl away
Fruit/Seed: Glossy brown conkers inside spiny green husks; inedible to humans (contain aesculin)
Habitat: Planted widely in parks and streets; native to Balkan mountains
Uses: Conkers — the autumn schoolyard game (traditional in Britain); seeds contain saponins used historically for washing and starch production; aescin extract used medicinally for poor circulation; provides spring pollen for bees
Notable Facts: Anne Frank's famous diary mentions watching a horse chestnut tree through the attic skylight; that tree fell in 2010 but seedlings from it were distributed worldwide
10. Black Walnut (Juglans nigra)
Leaves: Alternate; pinnately compound with 15–23 leaflets; leaflets lance-shaped; crushed leaves have distinctive aromatic walnut scent
Bark: Very dark gray-brown; deeply furrowed with interlacing ridges forming diamond pattern
Fruit/Seed: Large round nuts in green husks — husks stain skin black (used historically as dye)
Habitat: Rich moist bottomland forests in eastern North America
Uses: Extremely valuable dark hardwood — one of North America's premium cabinet and furniture woods; veneer for luxury items; nuts edible and highly nutritious; hull dye; medicinal bark
Notable Facts: Releases juglone from roots — allelopathic compound that kills or inhibits many plants growing nearby; a single tree can be worth thousands of dollars for its timber; squirrels' failure to retrieve all cached walnuts is their primary dispersal mechanism
11. Common Ash (Fraxinus excelsior)
Leaves: Opposite; pinnately compound with 9–13 leaflets; leaflets lance-shaped with serrated margins; last bud from stem with black buds distinctive; bare late into spring
Bark: Pale gray; smooth when young; develops interlacing ridges with age but never deeply furrowed
Fruit/Seed: Keys — single-winged samaras in large bunches, persisting into winter
Habitat: Woodland, stream margins across Europe; especially on limestone soils
Uses: Exceptionally tough, flexible hardwood — historically for tool handles, oar shafts, longbows, sports equipment; traditional in wheelwright and carriage work; leaves as fodder
Notable Facts: Ash dieback (Hymenoscyphus fraxineus) threatens 80% of European ash trees — potentially one of the worst ecological disasters to hit European woodland
12. Yellow Poplar / Tulip Tree (Liriodendron tulipifera)
Leaves: Alternate; unique saddle-shaped four-lobed leaf; bright green above; turns yellow in autumn; lobed with flat or slightly notched tip
Bark: Gray-green in youth; develops deep interlacing ridges with age
Fruit/Seed: Cone-like aggregate of samaras; upright on branches
Habitat: Rich moist forests in eastern North America; often one of tallest trees present
Uses: Light easily worked lumber — cabinetry, interior woodwork, musical instruments, canoes; one of eastern North America's most commercially important hardwoods; beautiful tulip-shaped flowers in spring
Notable Facts: Not a true poplar but related to magnolias; one of the fastest-growing eastern hardwoods; state tree of Kentucky, Indiana, and Tennessee
PART II: CONIFEROUS / EVERGREEN TREES
13. Scots Pine (Pinus sylvestris)
Leaves: Needles in pairs, 4–7 cm, blue-green, twisted slightly
Bark: Upper trunk and branches distinctive orange-red and scaly; lower trunk gray-brown with broad plates
Fruit/Seed: Small egg-shaped cones, 3–7 cm; take two years to ripen
Habitat: Native to Scotland and boreal Eurasia; acidic sandy and rocky soils; fire-adapted
Uses: Timber for construction, furniture, pit props; resin for turpentine and rosin; bark for tanning; pine needles for vitamin C tea; important Christmas tree
Notable Facts: The only native pine in Britain — ancient Caledonian pines in Scotland's Highlands are survivors of a vast Boreal forest; some specimens 500+ years old; major habitat for Scottish Crossbill, Red Squirrel, Capercaillie
14. Douglas Fir (Pseudotsuga menziesii)
Leaves: Flat needles, 2–3 cm; spiral arrangement; blue-green; crushed needles smell sweet
Bark: Young: smooth gray-green; old: massive thick corky brown ridges — one of North America's most distinctive barks
Fruit/Seed: Hanging cones with distinctive three-pointed bracts protruding like mouse tails
Habitat: Pacific coastal forests in western North America; grows to enormous size
Uses: North America's most commercially important timber species; construction lumber, plywood, veneer; Christmas tree; essential habitat for Northern Spotted Owl
Notable Facts: Can reach 100 meters tall; among the world's tallest trees; not a true fir (hence the hyphen in its name); some specimens over 1,300 years old; in wet coastal areas can form the densest biomass forests on Earth
15. Norway Spruce (Picea abies)
Leaves: Short sharp needles, 1–2.5 cm; four-sided; attached on woody pegs (peg remains after needle drops)
Bark: Red-brown to gray-brown; scaly plates becoming more fissured with age
Fruit/Seed: Cylindrical pendant cones, 10–18 cm — Europe's largest spruce cone
Habitat: Boreal and montane forests across northern and central Europe
Uses: The classic Christmas tree; timber for construction, pulp and paper; violin tops and soundboards (spruce resonance is ideal); telegraph poles
Notable Facts: Old Tjikko in Sweden — a Norway Spruce with root system dated to 9,550 years — is one of Earth's oldest individual organisms, though the trunk regenerates; resin historically used as natural chewing gum
16. Coast Redwood (Sequoia sempervirens)
Leaves: Flat needles, 5–25 mm; dark green above, two white stomatal bands below; scale-like on upper shoots
Bark: Thick (to 30 cm), fibrous, red-brown; fire resistant; deeply furrowed
Fruit/Seed: Small oval cones, 1.5–3.2 cm
Habitat: Coastal fog belt of northern California and southern Oregon; fog drip provides significant moisture
Uses: Highly valued for outdoor use — naturally rot and insect resistant; decking, fencing, outdoor furniture; indoor paneling
Notable Facts: World's tallest tree — Hyperion measured at 115.9 meters; can live over 2,000 years; grove in Muir Woods dates to before Notre Dame Cathedral was built; absorbs exceptional quantities of carbon per hectare
17. Eastern White Pine (Pinus strobus)
Leaves: Needles in bundles of 5, 6–14 cm, soft, blue-green, flexible
Bark: Young: smooth gray-green; mature: deeply furrowed, gray with reddish-brown furrowed ridges
Fruit/Seed: Long cylindrical cones, 8–20 cm; slightly curved; often resinous
Habitat: Eastern North American forests; often a canopy dominant; dry to moist sites
Uses: Extremely important colonial-era timber — straight-grained and tall for ship masts (King's Broad Arrow policy reserved large trees for Royal Navy); soft easily worked wood for interior carpentry, furniture, windows
Notable Facts: British Crown marking of pines over 24 inches DBH for the Navy was a major source of colonial resentment; largest eastern North American pine
18. Larch (Larix decidua — European Larch)
Leaves: Soft needles in rosettes on short spur shoots; 2–4 cm; bright green spring, golden yellow autumn — the deciduous conifer
Bark: Gray-brown with scaly furrowed ridges
Fruit/Seed: Small upright oval cones, 1–4 cm; persistent on branches for years
Habitat: Native to Alps and Carpathians; widely planted in Britain; mountain slopes
Uses: Durable timber for outdoor use, fence posts, boat building; resin (Venice turpentine); important forestry timber; spectacular autumn color makes it a landscape feature
Notable Facts: Rare among conifers in being deciduous; provides open, light woodland that supports wildflowers and diverse ground flora
19. Yew (Taxus baccata)
Leaves: Flat needles, dark green above, pale below; arranged in two rows; no single central vein
Bark: Red-brown, flaking in small scales to reveal orange-red undersurface
Fruit/Seed: Red fleshy arils (berry-like) surrounding single dark seed; aril edible, seed TOXIC
Habitat: Woodland understory, chalk and limestone; churchyards across Britain
Uses: Hardest, most durable native British wood — English longbow (Battle of Agincourt); decorative cabinetry; paclitaxel (Taxol) — powerful cancer-fighting compound derived from bark
Notable Facts: Most of the tree is highly poisonous (alkaloids); the Fortingall Yew in Scotland is estimated 2,000–5,000 years old — possibly Europe's oldest living tree; many churchyard yews pre-date the churches by centuries
20. Giant Sequoia (Sequoiadendron giganteum)
Leaves: Scale-like, 3–8 mm; spirally arranged; gray-green
Bark: Extremely thick (up to 60 cm) spongy red-brown fibrous bark; fire resistant
Fruit/Seed: Oval cones, 4–9 cm; can remain on tree for 20 years; heat releases seeds
Habitat: Western slopes of Sierra Nevada, California; distinct elevation band
Uses: Historically logged for timber (poor quality, brittle); now entirely protected; primary use: awe and carbon storage
Notable Facts: General Sherman is the world's largest tree by volume (1,487 cubic meters); can live over 3,000 years; fire is essential for reproduction — cones require heat to release seeds
PART III: TROPICAL & SUBTROPICAL TREES
21. Teak (Tectona grandis)
Leaves: Opposite; very large, oval, 30–60 cm; rough sandpaper texture; prominent veining
Bark: Gray to gray-brown; shallow interlacing furrows
Fruit/Seed: Nut enclosed in papery bladder-like covering
Habitat: Tropical monsoon forests in South and Southeast Asia
Uses: Premier tropical hardwood — naturally oily, extremely durable outdoors; premium outdoor furniture, boat decks, flooring, cabinetry; fire resistant
Notable Facts: Contains teak oil — gives natural weather resistance; one of the world's most valuable timbers; plantations now supply most commercial teak as wild stocks depleted
22. Mahogany (Swietenia macrophylla — Big-leaf Mahogany)
Leaves: Alternate; pinnately compound with 3–9 pairs of leaflets; leaflets oval-lanceolate; asymmetric at base
Bark: Gray-brown; shallow scaly fissures
Fruit/Seed: Large woody capsule, 10–20 cm; splits to release winged seeds
Habitat: Tropical forests of Central and South America
Uses: The original "mahogany" of fine furniture — warm reddish-brown, stable, beautiful grain; 18th-century cabinetmakers (Chippendale) used it almost exclusively; veneers, musical instruments, boat-building
Notable Facts: Now in CITES Appendix II due to over-exploitation; genuinely wild trees increasingly rare; much "mahogany" sold today is substitute species
23. Kapok (Ceiba pentandra)
Leaves: Alternate; palmately compound with 5–9 leaflets; leaflets narrow-lanceolate
Bark: Gray-green; young trees have conical spines; massive buttress roots
Fruit/Seed: Large pods releasing silky cotton-like fiber surrounding seeds
Habitat: Tropical forests of Central/South America and West Africa
Uses: Kapok fiber (from seed pods) for stuffing — mattresses, pillows, life jackets; lightweight insulating properties; oil from seeds; lumber (soft)
Notable Facts: National tree of Guatemala; considered sacred by Maya — "World Tree" (Yaxche) at center of Maya cosmology; can reach 70 meters; distinctive umbrella-shaped crown visible above forest canopy
24. Banyan (Ficus benghalensis)
Leaves: Alternate; large oval, 10–30 cm; leathery; prominent veining
Bark: Gray; aerial roots descend from branches and thicken into secondary trunks
Fruit/Seed: Small round figs in pairs, turning red
Habitat: Tropical South and Southeast Asia; needs support for spreading branches
Uses: Shade tree of great cultural importance; bark and leaves used medicinally; latex for rubber; timber occasionally
Notable Facts: The largest single tree by canopy coverage — the Great Banyan in Kolkata covers 1.89 hectares with over 3,000 aerial root-prop-trunks; considered sacred in Hinduism, Buddhism, and Sikhism; Buddha reportedly received enlightenment under a related species (Bodhi tree, Ficus religiosa)
25. Cacao (Theobroma cacao)
Leaves: Alternate; large oval, 20–40 cm; reddish when young
Bark: Gray-brown; rough and scaly
Fruit/Seed: Large melon-shaped pods (20–35 cm) growing directly on trunk and major branches (cauliflory); yellow to orange-red when ripe; seeds (beans) surrounded by white pulp
Habitat: Tropical understory below 300 meters; Central and South America origin
Uses: The source of all chocolate and cocoa; pods harvested, fermented, dried; fat extracted as cocoa butter; pulp eaten fresh or fermented for beverages
Notable Facts: The original beverage was a bitter spiced drink consumed by Olmec, Maya, and Aztec civilizations; the scientific name means "food of the gods"; now cultivated across tropical belt; value as a crop drives significant tropical deforestation
26. Rubber Tree (Hevea brasiliensis)
Leaves: Alternate; trifoliate (three leaflets); leaflets oval, 10–25 cm
Bark: Smooth gray-green; milky latex bleeds from cuts
Fruit/Seed: Large 3-seeded capsule that explodes to disperse seeds
Habitat: Tropical rainforests of Amazon Basin; now planted across tropical Asia
Uses: Primary source of natural rubber; latex tapped from bark by cutting shallow diagonal grooves; tires, surgical gloves, countless rubber products; timber (rubberwood) after trees become unproductive
Notable Facts: Southeast Asian plantations supply most world rubber; synthetic rubber now dominates but natural rubber essential for specific applications; the entire global industry traces to seeds smuggled from Brazil in the 1870s
27. African Baobab (Adansonia digitata)
Leaves: Alternate; palmately compound with 5–7 leaflets; appear briefly in wet season
Bark: Smooth, gray-pink; deeply furrowed with age; impressively thick
Fruit/Seed: Large velvety fruit, 15–30 cm; powdery white edible pulp
Habitat: Dry African savanna south of the Sahara
Uses: "Tree of life" — every part used: fruit pulp (extremely high vitamin C — "superfood"); leaves as vegetable; seeds for oil; bark fiber for rope and cloth; hollow trunks store water (up to 100,000 liters); medicinal bark
Notable Facts: Can live 2,000+ years — "upside down trees" appear to have roots in the air; some individuals hollow naturally and have been used as shelters, bars, prisons, and a post office; the massive trunks are >50% water
28. Eucalyptus / Blue Gum (Eucalyptus globulus)
Leaves: Mature leaves alternate, lance-shaped, 10–30 cm; blue-gray, aromatic; juvenile leaves opposite, round, clasping
Bark: Smooth blue-gray to cream; sheds in long ribbons
Fruit/Seed: Woody cup-shaped capsules ("gum nuts")
Habitat: Native to southeastern Australia; planted worldwide in tropics
Uses: Essential oil from leaves for medicinal and industrial use; fast-growing timber for pulp, paper, charcoal; windbreaks; nectar for bees and wildlife
Notable Facts: Over 700 Eucalyptus species — most uniquely Australian; oil-rich leaves make them highly flammable (fire-adapted — resprout after fire); koalas are almost exclusively eucalyptus leaf eaters; can grow 2 meters per year; allelopathic chemicals suppress ground vegetation
PART IV: URBAN & ORNAMENTAL TREES
29. London Plane (Platanus × acerifolia)
Leaves: Alternate; large maple-like with 3–5 pointed lobes; coarsely toothed
Bark: The signature feature: smooth patches of cream, olive, brown, and gray — "camouflage" pattern as outer bark flakes away; highly distinctive
Fruit/Seed: Hanging ball-shaped seed clusters on long stalks; persist through winter
Habitat: City streets, parks worldwide; exceptionally tolerant of pollution and compaction
Uses: Urban street and park tree — can withstand pollution because the flaking bark removes absorbed pollutants; timber occasionally used for furniture
Notable Facts: A hybrid between American Sycamore and Oriental Plane; Berkeley Square London and many European boulevards lined with them; some London planes are over 400 years old; largest tree species in many European cities
30. Japanese Cherry / Sakura (Prunus serrulata)
Leaves: Alternate; oval with pointed tip and finely serrated margin; bronze-green spring, green summer, orange-red autumn
Bark: Smooth purplish-brown with horizontal lenticels; peels in ribbons
Fruit/Seed: Small black cherries (most ornamental varieties sterile; some produce cherries)
Habitat: Parks, gardens, streets worldwide; native to Japan
Uses: Primarily ornamental — the blossoms (sakura) are of profound cultural importance in Japan; wood occasionally for small craft items and smoking food
Notable Facts: Cherry blossom viewing (hanami) is one of Japan's most important cultural traditions dating over 1,000 years; Japan's Meteorological Agency tracks cherry bloom dates as indicator of climate change; pink blossoms last only 1–2 weeks
31. Ginkgo (Ginkgo biloba)
Leaves: Alternate; distinctive fan-shaped with central notch; unique among trees; bright green turning brilliant yellow in autumn
Bark: Gray; young bark smooth; old bark develops deep fissures
Fruit/Seed: Female trees produce round yellow fruit that smells unpleasant when ripe (butyric acid); inner seed edible when roasted
Habitat: Native to China; planted worldwide as ornamental
Uses: Ginkgo extract in supplements — used for memory and circulation (evidence mixed but widely used); seeds (bai guo) in Chinese cuisine; urban tree due to remarkable stress tolerance
Notable Facts: "Living fossil" — virtually unchanged for 200 million years; the only survivor of a once diverse class; survived Hiroshima atomic bomb blast just 1 km from center; some Chinese trees are over 3,000 years old; most planted specimens are male (odorless)
32. Weeping Willow (Salix babylonica)
Leaves: Alternate; lance-shaped, 7–16 cm; very narrow; pale green; hanging pendulous branches
Bark: Brown-gray; deeply furrowed with age
Fruit/Seed: Tiny cottony seeds in catkins
Habitat: Planted near water worldwide; originally from China
Uses: Landscape and water's-edge planting; bark contains salicin — the original aspirin (willow bark used medicinally for millennia); stabilizes stream banks with root system; basket weaving from young shoots (cricket bat willow)
Notable Facts: Napoleon reputedly loved willows; cuttings from the willow at his grave at St. Helena were distributed worldwide; willows can regrow from almost any fragment — break a branch and plant it
33. Jacaranda (Jacaranda mimosifolia)
Leaves: Opposite; bipinnately compound (feathery); fern-like; deciduous before flowering
Bark: Pale brown; thin scaly plates
Fruit/Seed: Flat woody capsules, 5–6 cm
Habitat: Native to South America; extensively planted in subtropical and warm-temperate regions worldwide
Uses: Highly valued ornamental street and garden tree for spectacular purple-blue blossom; some timber use
Notable Facts: Purple blossom season transforms cities in South Africa, Spain, Australia; popular local folklore holds that a jacaranda blossom falling on your head during university exams brings good luck
34. Northern Catalpa (Catalpa speciosa)
Leaves: Opposite or whorled; very large, heart-shaped, 20–35 cm; velvety below; emit unpleasant smell when crushed
Bark: Gray-brown; scaly furrowed ridges on mature trees
Fruit/Seed: Long thin bean-like pods, 25–50 cm; persist through winter (the "cigar tree")
Habitat: Bottomlands and moist sites in central-eastern North America; widely planted
Uses: Durable fence posts and railroad ties; widely planted as ornamental shade tree; catalpa sphinx caterpillars are prized fish bait — some plant catalogues specifically for this purpose
Notable Facts: The "cigar tree" — long dangling pods are distinctive; large showy white flower clusters; popular shade tree despite controversy over litter from pods and leaves
35. Southern Magnolia (Magnolia grandiflora)
Leaves: Alternate; large, oval-elliptic, 20–35 cm; glossy dark green above; rusty-brown felty coating below; evergreen
Bark: Gray; smooth when young, scaly with age
Fruit/Seed: Cone-like aggregate of follicles releasing red seeds on silky threads
Habitat: Rich moist soils of southeastern United States; widely planted
Uses: Landscape tree; timber occasionally; flowers and cones used in decorative arrangements
Notable Facts: Flowers up to 30 cm across — among world's largest flowers on a temperate tree; the magnolia family is one of the most ancient flowering plant lineages — evolved before bees, so beetles are primary pollinators; state flower of Mississippi and Louisiana
PART V: MORE NOTABLE TREES (36–50)
36. Coast Live Oak (Quercus agrifolia)
Leaves: Alternate; oval, 2.5–7 cm; spiny-toothed like holly; dark green above; often cupped
Bark: Dark gray-brown; deeply furrowed and plated
Fruit/Seed: Long pointed acorns; important wildlife mast
Habitat: California coastal and valley woodland
Uses: Historical importance to California indigenous peoples — acorns ground into staple flour; wildlife habitat; landscape tree
Notable Facts: Evergreen oak; ancient trees create "oak woodland" ecosystem; susceptible to Sudden Oak Death (Phytophthora ramorum)
37. Olive (Olea europaea)
Leaves: Opposite; narrow-lanceolate; gray-green above, silvery-white below; leathery; evergreen
Bark: Pale gray; deeply furrowed and twisted on ancient trees
Fruit/Seed: Oval drupe (olive); green ripening to black; single pit
Habitat: Mediterranean basin; hot dry summers; rocky soils; frost-sensitive
Uses: Olive oil — cornerstone of Mediterranean diet; preserved table olives; wood for fine carving and small furniture; medicinal leaves; soap
Notable Facts: Can live over 2,000 years — some trees in Gethsemane garden may have roots from ancient specimens; the olive branch is one of humanity's oldest peace symbols; over 800 million trees cultivated worldwide
38. Cork Oak (Quercus suber)
Leaves: Alternate; oval, toothed; dark green above; whitish below; evergreen
Bark: Incredibly thick corky bark — spongy, furrowed, fire-resistant; this is the bark harvested for cork products
Fruit/Seed: Acorns with deeply scaled cups
Habitat: Western Mediterranean — particularly Portugal (world's largest producer) and Spain
Uses: Cork stoppers for wine bottles; flooring, insulation, life preservers; bark regenerates after stripping every 9 years without harming tree
Notable Facts: The bark can be harvested without cutting the tree — one of only a few commercially harvested bark crops; cork forests (montado) support unique biodiversity including Iberian Lynx and Imperial Eagle
39. Paper Birch (Betula papyrifera)
Leaves: Alternate; ovate-triangular; coarsely toothed; bright yellow in autumn
Bark: Bright white with black markings; peels in papery horizontal sheets — one of North America's most recognizable trees
Fruit/Seed: Small winged nutlets in catkins
Habitat: Northern forests and burned areas across North America
Uses: Bark for canoe building (birchbark canoe) — essential to indigenous cultures across Canada; bark for writing, baskets, containers; sap for syrup; wood for paper pulp
Notable Facts: Bark is naturally waterproof and antiseptic; canoe-grade bark is ideally 8–10 mm thick; traditional Ojibwe birchbark canoes were one of the finest watercraft ever designed — light, durable, repairable from materials found anywhere along the route
40. Black Locust (Robinia pseudoacacia)
Leaves: Alternate; pinnately compound with 7–19 oval leaflets; pale green; late to leaf out
Bark: Very dark gray; deeply furrowed with interlacing rope-like ridges
Fruit/Seed: Flat brown bean pods, 5–10 cm; persist through winter
Habitat: Eastern North American dry rocky or sandy woodland; invasive in Europe
Uses: Exceptionally rot-resistant wood — fence posts, decking, wooden nails in shipbuilding; flowers for honey (locust honey is highly prized); nitrogen-fixing roots improve soil
Notable Facts: Invasive in Europe but valuable for erosion control; flowers one of the best honey sources; wood lasts 100+ years in ground contact — outlasts most treated lumber
41. Coconut Palm (Cocos nucifera)
Leaves: Pinnate fronds, 4–6 meters; leaflets narrow and arching
Bark: Fibrous, ringed trunk with scars from fallen fronds; leans toward light
Fruit/Seed: Coconut — hard-shelled nut; white endosperm; coconut water
Habitat: Tropical coasts worldwide; salt-tolerant; high-water sandy soils
Uses: "Tree of life" in Pacific cultures — virtually every part used: coconut water, copra (dried endosperm) for cooking oil and soap, milk from grated flesh, coir fiber from husk for rope and matting, wood for construction, leaves for thatching and weaving, toddy (fermented sap) for wine
Notable Facts: The coconut is the most widely distributed tropical fruit; spread largely by ocean currents and human dispersal; coconuts are technically a drupe (not a nut); provides more food, drink, and material than any other tree
42. Date Palm (Phoenix dactylifera)
Leaves: Pinnate fronds, 3–5 meters; leaflets stiff and pointed
Bark: Fibrous brown trunk covered in diamond-shaped leaf base scars
Fruit/Seed: Date — oblong, amber-brown; very sweet
Habitat: Hot arid regions of Middle East and North Africa; requires water but withstands desert heat
Uses: Dates — staple food for desert peoples for 5,000+ years; the "bread of the desert"; leaves for thatching, baskets; wood for construction; pits for animal feed
Notable Facts: The oldest date palms may be over 200 years old; some date palm pollen used to pollinate Judean date palm trees grown from seeds found at Masada (over 2,000 years old); a single tree can produce 100 kg of dates per year
43. Black Cherry (Prunus serotina)
Leaves: Alternate; lance-shaped with finely serrated margins; dark green above; distinctive brownish hairs along midrib below
Bark: Young: dark reddish-brown, smooth; mature: breaks into thick irregular black scaly plates
Fruit/Seed: Small round cherries, green turning red to black
Habitat: Forest edges, disturbed areas in eastern North America; pioneer species
Uses: Premium reddish cabinet wood — furniture, veneers, musical instruments, cabinetry; prized for chocolate-brown to red color with age; fruit for jelly, wine; birds value fruit
Notable Facts: Fruit and leaves (wilted especially) contain cyanogenic compounds — toxic to livestock; birds eat fruit without harm; one of eastern North America's most valuable cabinet woods after Black Walnut
44. Sitka Spruce (Picea sitchensis)
Leaves: Sharp, stiff, four-sided needles; blue-green; very sharp to touch
Bark: Thin, scaly, purple-brown; distinctive papery scales
Fruit/Seed: Cylindrical cones, 6–10 cm; flexible papery scales
Habitat: Pacific coastal fog belt from Alaska to northern California
Uses: Extremely lightweight but strong — Sitka Spruce was used for WWI aircraft frames and the Wright Brothers' Flyer; still used for high-end acoustic guitar tops and violins; primary paper pulp species in Pacific Northwest
Notable Facts: World's largest Sitka Spruce on the Olympic Peninsula; the ratio of strength to weight rivals aluminum
45. Sweet Chestnut (Castanea sativa)
Leaves: Alternate; lance-shaped with sharp-toothed margins; 15–30 cm; distinctive prominent parallel veins
Bark: Young: smooth gray; mature: spiraling deep ridges creating distinctive pattern
Fruit/Seed: Edible chestnuts in very spiny husks (unlike horse chestnut)
Habitat: Woodland and plantations on acidic soils in southern Europe; widely planted in Britain
Uses: Edible chestnuts — roasted, ground into flour (chestnut flour essential in parts of Italy), confections (marrons glacés); highly durable coppice timber — fence posts, hop poles, walking sticks; long history of coppice management
Notable Facts: Introduced to Britain by Romans; chestnut coppice woodland is one of Britain's richest wildlife habitats; the tree of Corsica and parts of Mediterranean forms whole forests ("bread tree" cultures); Chestnut blight (Cryphonectria parasitica) devastated American Chestnut
46. Hawthorn (Crataegus monogyna)
Leaves: Alternate; small, deeply lobed (3–7 lobes); dark green above
Bark: Orange-brown; scaly and fissured; armed with long thorns
Fruit/Seed: Haws — small round red berries in autumn; single seed
Habitat: Hedgerows, woodland edges, scrubland across Europe — the classic hedgerow tree/shrub
Uses: Wildlife — flowers, berries, dense thorny structure provide food and nesting; haws for jelly; flowers edible (May blossom); medicinally for cardiovascular support (cardiac herbs from berries); impenetrable hedging
Notable Facts: May blossom and the custom of May Day celebrations; some hawthorns are over 700 years old in English hedgerows; one of the most wildlife-valuable trees in Britain — flowers feed pollinators, berries feed birds; ancient Christian associations (Crown of Thorns often attributed to hawthorn)
47. Rowan / Mountain Ash (Sorbus aucuparia)
Leaves: Alternate; pinnately compound with 5–9 pairs of leaflets; leaflets oval and toothed; turns red-orange in autumn
Bark: Gray; smooth with horizontal lenticels; doesn't fissure much even on old trees
Fruit/Seed: Bright red-orange berry clusters in autumn; very high vitamin C; bitter raw but palatable cooked
Habitat: Mountains, moorland, woodland throughout Europe; tolerates thin acid soils; the "mountain ash" grows higher than almost any other tree in Britain
Uses: Rowan jelly — traditional accompaniment to game; wood for tool handles, bows; berries for wine; medicinally for scurvy (high vitamin C)
Notable Facts: Deeply embedded in Celtic and Norse folklore — planted by doors to ward off witches; abundant berries a critical autumn food source for Redwings, Fieldfares, and other thrushes
48. Elder (Sambucus nigra)
Leaves: Opposite; pinnately compound with 5–7 leaflets; leaflets oval and toothed; unpleasant smell when crushed
Bark: Light gray-brown; corky and deeply furrowed
Fruit/Seed: Black-purple elderberries in flat-topped clusters; flowers in flat-topped heads
Habitat: Woodland edges, hedgerows, disturbed ground, gardens across Europe
Uses: Flowers for elderflower cordial, wine, fritters; berries for wine, cordial, jelly, syrup (high in antioxidants; traditionally for colds and flu); medicinally used across cultures for centuries; wood for toys and pith experiments
Notable Facts: Sometimes called "the medicine chest of the country people"; flowers and ripe berries edible, but leaves, bark, raw unripe berries, and seeds contain cyanogenic glycosides — should be cooked; traditional that you must ask the Elder Mother (spirit inhabiting the tree) before harvesting
49. Box Elder / Manitoba Maple (Acer negundo)
Leaves: Opposite; pinnately compound (unique among maples) with 3–7 leaflets
Bark: Gray; shallowly furrowed; rather rough and scaly
Fruit/Seed: Paired samaras (helicopter seeds); V-shaped
Habitat: Streambanks and disturbed areas; very cold-hardy — the maple that grows on the Great Plains
Uses: Syrup production (lower yield and quality than sugar maple but possible); wood for pulp and minor uses; widely planted as street tree in cold climates
Notable Facts: Most cold-tolerant maple; often colonizes disturbed ground; harbors Box Elder Bug in large populations
50. Monkey Puzzle (Araucaria araucana)
Leaves: Scale-like; hard, sharp, triangular; 3–4 cm; arranged in spirals; persist for years
Bark: Gray-green; distinctive reticulated pattern like elephant skin; rings of old branch scars visible
Fruit/Seed: Large spherical cones, 15–20 cm; edible seeds (piñon) the size of an olive
Habitat: Volcanic slopes of Andes in Chile and Argentina; fire-resistant
Uses: Seeds (piñon) are staple food of Mapuche indigenous peoples — roasted or ground into flour; timber for construction (now protected); religious and cultural importance to Mapuche; ornamental curiosity planted worldwide
Notable Facts: Name from a 19th-century remark that "it would puzzle a monkey to climb it"; a critically important food source for indigenous peoples; trees can live over 1,000 years; the species has survived relatively unchanged for over 200 million years
Tree ID Quick Reference
| Feature | Trees to Check |
|---|---|
| Opposite leaves | Maples, Ash, Elder, Catalpa, Horse Chestnut |
| Compound leaves | Ash, Rowan, Walnut, Black Locust, Elder |
| White peeling bark | Birch species |
| Camouflage/flaking bark | London Plane, Sycamore |
| Spiny/thorny | Hawthorn, Black Locust, Holly |
| Distinctive bark ridges | Oak, Walnut, Black Cherry |
| Needle leaves | Pines, Spruce, Fir, Yew |
| Fan-shaped leaves | Ginkgo (unique) |
The Observatory Almanac — Section 16: Field Guides