PlantsTrees
There is no taxonomic rank for trees. A tree is always a woody perennial, and usually has a solitary trunk. The difference between a large shrub and a small tree may be a matter of opinion, especially if it forms thickets.

Leaf Arrangement Leaf Complexity Leaf Margin

The following genera are arranged alphabetically by family.
Arkansas Yucca
Yucca — Genus Yucca
Tree or shrub. Family Agavaceae.
Sumacs
Sumacs — Family Anacardiaceae
Tree, shrub, or vine. Leaves alternate, compound. Flowers white, cream, yellow, or green. 5 petals. 5 stamens. Fruit is a 1-seeded red or white drupe.
No image available.
Pawpaw — Genus Asimina
Large shrub or small tree. Leaves large, alternate, entire. Fruit is large. Family Annonaceae.
Possumhaw
Holly — Genus Ilex
Small tree or shrub. Leaves alternate, simple. The fruit is a red or orange berry. Family Aquifoliaceae.
No image available.
Devil's Walkingstick — Genus Aralia
Tree, shrub, or herb. Stamens 5. Family Araliaceae.
Dwarf Palmetto
Palmettos — Family Arecaceae
Tree or shrub.
No image available.
Birch Family — Family Betulaceae
Tree or shrub. Leaves alternate, simple. Leaf margins sharply toothed. Male flowers in catkins. Fruit a winged samara or unwinged nutlet.
Northern Catalpa
Catalpa — Genus Catalpa
Tree. Leaves simple, opposite or in a whorl of three. Uppermost leaves are alternate. Family Bignoniaceae.
Desert Willow
Desert Willow — Genus Chilopsis
Tree or shrub. Leaves simple, willow-like. The leaves may be opposite or alternate. Flowers large and showy. Family Bignoniaceae.
Anacahuita
Anacahuita — Genus Cordia
Tree or shrub. Leaves alternate, simple, entire. Family Boraginaceae.
Knockaway
Knockaway — Genus Ehretia
Tree or shrub. Leaves alternate, simple, entire, sessile, rough, hairy. Flowers tubular, salverform, or funnelform. Fruit a nutlet. Family Boraginaceae.
Black Elderberry
Elderberry — Genus Sambucus
Large shrub or small tree. Leaves opposite, pinnately compound. Fruit purple/black. Family Caprifoliaceae.
Rusty Blackhaw
Blackhaw — Genus Viburnum
Flowers radially symmetrical. Family Caprifoliaceae.
Dogwood — Genus Cornus
Family Cornaceae.
No image available.
Arizona Cypress — Genus Callitropsis
Tree. Family Cupressaceae.
Ashe Juniper
Juniper — Genus Juniperus
Tree or shrub. Family Cupressaceae.
Montezuma Bald Cypress
Bald Cypress — Genus Taxodium
Family Cupressaceae.
No image available.
Titi — Genus Cyrilla
Small tree or tall shrub, often in thickets. Leaves alternate, simple. Flowers small, white. Petals 5, sepals 5, stamens 5. Family Cyrillaceae.
Common Persimmon
Persimmon — Genus Diospyros
Tree or shrub. Family Ebenaceae.
Texas Madrone
Heath Family — Family Ericaceae
Tree, shrub, or herb. Leaves alternate, simple. This family now includes Monotropaceae.
Chinese Tallow Tree
Chinese Tallow Tree — Genus Triadica
Tree. Leaves alternate. No petals. Flowering Aug-Nov. Family Euphorbiaceae.
Fern Acacia
Acacia — Genus Acacia
Tree or shrub. Family Fabaceae.
Silk Tree
Silk Tree — Genus Albizia
Tree. Leaves alternate, twice pinnately compound. Flowering May-Jun. Family Fabaceae.
Eastern Redbud
Eastern Redbud — Genus Cercis
Tree. Leaves alternate, simple. Flowering Mar-Apr. Family Fabaceae.
Texas Ebony
Texas Ebony — Genus Ebenopsis
Tree or shrub. Leaves alternate, twice pinnately compound. Family Fabaceae.
Common Honey-locust
Locust — Genus Gleditsia
Tree. Leaves alternate, pinnately compound. Family Fabaceae.
No image available.
Haujillo — Genus Havardia
Small tree or shrub. Leaves alternate, twice pinnately compound. Family Fabaceae.
Littleleaf Leadtree
Leadtree — Genus Leucaena
Tree or shrub. Leaves alternate, compound. Family Fabaceae.
Jerusalem Thorn
Paloverde — Genus Parkinsonia
Tree or shrub. Leaves alternate, compound. Family Fabaceae.
Honey Mesquite
Mesquite — Genus Prosopis
Tree or shrub. Family Fabaceae.
No image available.
Locust — Genus Robinia
Tree or shrub. Family Fabaceae.
Texas Mountain Laurel
Necklacepod — Genus Sophora
Tree, shrub, or herb. Leaves alternate, compound. Family Fabaceae.
Eve's-necklace
Eve's Necklace — Genus Styphnolobium
Tree. Leaves alternate, pinnately compound. Leaflets 12-18, oval, 1". Flowers white to pink. Flowering Apr-May. Family Fabaceae.
Shumard's Oak
Beech, Chinkapin & Oaks — Family Fagaceae
Sweetgum
Witchhazel & Sweetgum — Family Hamamelidaceae
Trees. Leaves alternate, simple.
Pecan
Hickory — Genus Carya
Nut producing trees. Leaves alternate, pinnately compound. Male flowers in catkins. Family Juglandaceae.
Black Walnut
Walnut — Genus Juglans
Nut producing trees. Leaves alternate, pinnately compound. Male flowers in catkins. Family Juglandaceae.
No image available.
Laurel Family — Family Lauraceae
Small aromatic tree or shrub. Leaves alternate, simple, deciduous. Flowers yellowish, no petals, 6 sepals, either with 9 stamens and no pistil, or with a pistil and rudimentary stamens. Fruit is a small red or blue drupe.
Southern Magnolia
Magnolia & Tuliptree — Family Magnoliaceae
Ours are trees. Leaves alternate, simple.
No image available.
Basswood — Genus Tilia
Tree. Leaves alternate, simple, deciduous. Family Malvaceae.
Chinaberry
Chinaberry — Genus Melia
Tree. Leaves alternate, bipinnately compound. Flowers lavender(/whitish). Petals 5, sepals 5. Flowering Apr-May. Fruit is an amber drupe. Family Meliaceae.
No image available.
Edible Fig — Genus Ficus
Tree or shrub. Leaves alternate, simple. Family Moraceae.
Osage Orange
Osage Orange — Genus Maclura
Tree. Leaves alternate, simple. Margins entire. Family Moraceae.
Red Mulberry
Mulberries — Genus Morus
Leaves alternate, simple. Leaf margins toothed or lobed. Family Moraceae.
Black Tupelo
Tupelo — Genus Nyssa
Tree. Leaves alternate, simple. Fruit a blue-black drupe. Family Nyssaceae.
No image available.
White Fringetree — Genus Chionathus
Tree or shrub. Leaves opposite, simple, deciduous. Flowers 4-lobed. Usually 2 or 4 stamens, with anthers usually touching. Family Oleaceae.
Swamp-privet
Swamp-privet & Spring-herald — Genus Forestiera
Shrub or small tree. Leaves opposite, simple. Leaf margins almost entire, but unlike the privets, they are very slightly toothed. Flowers 4-lobed. Fruit is a small drupe. Family Oleaceae.
Green Ash
Ash — Genus Fraxinus
Tree. Leaves opposite, pinnately compound. Fruit is a samara. Family Oleaceae.
Japanese Ligustrum
Privet — Genus Ligustrum
Tree or shrub. Leaves opposite, simple. Leaf margins entire. Flowers 4-lobed. Fruit is a small drupe. These are all very aggressive invaders. Family Oleaceae.
No image available.
Princesstree — Genus Paulownia
Tree. Leaves opposite. Flowering Apr-May. Fruit an egg-shaped capsule. Family Paulowniaceae.
Loblolly Pine
Pine — Genus Pinus
Family Pinaceae.
No image available.
Douglas-fir — Genus Pseudotsuga
Tree. Family Pinaceae.
American Sycamore
American Sycamore — Genus Platanus
Leaves alternate, simple, lobed. Fruits are balls dangling from stems like ornaments. Family Platanaceae.
No image available.
Brazilian Bluewood — Genus Condalia
Tree or shrub. Leaves alternate, simple. Family Rhamnaceae.
Carolina Buckthorn
Buckthorn — Genus Rhamnus
Leaves alternate, simple. Family Rhamnaceae.
Alderleaf Mountain Mahogany
Mountain Mahogany — Genus Cercocarpus
Tree. Leaves alternate, simple. Family Rosaceae.
Greenhaw
Hawthorns — Genus Crataegus
Tree, usually with thorns. Leaves alternate, simple, toothed. Flowers with 5 petals and many stamens, inferior ovary, 2-5 styles. Fruit is a pome. Family Rosaceae.
No image available.
Apples — Genus Malus
Small tree. Leaves alternate, simple. Family Rosaceae.
Chickasaw Plum
Plums & Peach — Genus Prunus
Tree or shrub. Leaves alternate, simple. Flowers with 5 petals and many stamens, superior ovary, 1 style. Fruit is a drupe with a single stone. Family Rosaceae.
Callery Pear
Pears — Genus Pyrus
Tree. Leaves alternate, simple. Family Rosaceae.
Prickly-ash
Citrus Family — Family Rutaceae
Small tree or shrub. Leaves alternate, compound. Thamnosma texana is a perennial herb with simple leaves.
Cottonwood
Cottonwood — Genus Populus
Tree. Family Salicaceae.
Black Willow
Willow — Genus Salix
Tree. Family Salicaceae.
Box-elder
Maples — Genus Acer
Trees. Family Sapindaceae.
Ohio Buckeye
Buckeye — Genus Aesculus
Tree. Leaves opposite, palmately compound. Family Sapindaceae.
Western Soapberry
Western Soapberry — Genus Sapindus
Tree. Leaves alternate, compound. Leaflets 4-19 alternating on stalk. Leaflets entire, or nearly so. Flowering May-Jun. Family Sapindaceae.
Mexican-buckeye
Mexican-buckeye — Genus Ungnadia
Tree. Leaves alternate, compound. Flowering Apr. Family Sapindaceae.
Chittamwood
Chittamwood & Bully — Genus Sideroxylon
Tree or shrub. Leaves alternate, simple. Fruits purplish-black. Family Sapotaceae.
Tree-of-heaven
Tree-of-heaven — Genus Ailanthus
Tree. Leaves alternate, pinnately compound. Flowers small, petals 5, sepals 5, stamens 10. Flowering Apr. Family Simaroubaceae.
No image available.
Silverbells — Genus Halesia
Deciduous tree. Leaves alternate, simple. Family Styracaceae.
No image available.
Snowbells — Genus Styrax
Tree or shrub. Leaves alternate, simple, deciduous. Family Styracaceae.
No image available.
Sweetleaf — Genus Symplocos
Tree. Leaves alternate, simple. Flowers with many stamens. Family Symplocaceae.
No image available.
Tamarisk & Saltcedar — Genus Tamarix
Tree or shrub. Leaves small and scale-like. Family Tamaricaceae.
Sugarberry
Hackberries — Genus Celtis
Tree. Leaves alternate, simple. Leaf margins entire or with a few teeth. Flowers small, greenish. Family Ulmaceae.
Winged Elm
Elms — Genus Ulmus
Trees. Leaves alternate, simple, toothed. Leaf margins are typically doubly serrate. Flowers small, greenish. Family Ulmaceae.
Common Chastetree
Chastetrees — Genus Vitex
Family Verbenaceae.

More information

All of the trees listed on this page may also be found in top-down fashion by starting at the pages for conifers (class Pinopsida) or flowering plants (class Magnoliopsida). There is a tendency to treat trees separately because of their great economic importance, and also because they stand out year round, not just when flowering or fruiting. Close examination of floral parts is usually the key to identifying flowering plants, but all of our conifers are trees, and they do not flower. The trees that do often have small inconspicuous flowers. It is important to be able to identify a tree based on leaves and other features. On the other hand, some trees do have very showy flowers. If such is the case with your specimen, then you may have better luck starting on the Magnoliopsida page.


















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