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Trema
Family: Cannabaceae
Trema image
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Leila M. Schultz in Flora of North America (vol. 3)
Trees or shrubs , spindly, to 15 m; crowns variable. Bark dark brown or gray brown, smooth, shallowly furrowed, sometimes sometimes appearing warty with large, raised lenticels. Branches unarmed, stout; twigs hoary tomentose. Leaves: stipules ephemeral. Leaf blade: ovate, base oblique to cordate or truncate, margins crenate to serrate; venation palmate at base, pinnate on remainder of blade. Inflorescences cymes, compact to lax, 12-20-flowered. Flowers mostly unisexual, usually staminate and pistillate on same plants, appearing after leaves on new stems, in 1 series, pedicellate; calyx 5-parted. Bisexual flowers , if present: pedicel present; ovaries ± globose; styles persistent, 2, glabrous; stigmas 2, unbranched. Staminate flowers: nearly sessile; pistillodes present. Pistillate flowers: pedicel present; staminodes absent. Fruits drupes, globose, fleshy. Stones thick walled. Trema cannabina Loureiro and T . orientalis (Linnaeus) Blume, sometimes reported for North America, are Old World species occasionally planted but not known to have escaped from cultivation. Trema species are fast-growing pioneer trees with economically important alkaloids.

Trema is a member of the subfamily Celtoideae. Species are locally called nettletrees in reference to their superficial resemblance to members of the Urticaceae. Further studies of variation in this group are needed in the field and in the laboratory, giving special consideration to the morphologic variants within Trema micrantha .

Show all taxa
Trema angustifolia
Image of Trema angustifolia
Trema aspera
Images
not available
Trema cannabina
Image of Trema cannabina
Trema cubensis
Image of Trema cubensis
Trema eurhynchum
Images
not available
Trema integerrima
Image of Trema integerrima
Trema lamarckiana
Image of Trema lamarckiana
Trema micrantha
Image of Trema micrantha
Trema orientalis
Image of Trema orientalis
Trema politoria
Image of Trema politoria
Trema tomentosa
Image of Trema tomentosa
The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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