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Trema

Trema
Family: Cannabaceae
Trema image
  • FNA
  • Resources
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 .

Species within inventory project: Arizona Flora
Trema angustifolia
Media resource of Trema angustifolia
Map not
Available
Trema aspera
Media
not available
Map not
Available
Trema cannabina
Media resource of Trema cannabina
Map not
Available
Trema cubensis
Media resource of Trema cubensis
Map not
Available
Trema eurhynchum
Media
not available
Map not
Available
Trema integerrima
Media resource of Trema integerrima
Map not
Available
Trema integerrimum
Media resource of Trema integerrimum
Map not
Available
Trema lamarckiana
Media resource of Trema lamarckiana
Map not
Available
Trema micrantha
Media resource of Trema micrantha
Map not
Available
Trema orientalis
Media resource of Trema orientalis
Map not
Available
Trema politoria
Media resource of Trema politoria
Map not
Available
Trema rigidum
Media resource of Trema rigidum
Map not
Available
Trema tomentosa
Media resource of Trema tomentosa
Map not
Available
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This project was made possible in part by the Institute of Museum and Library Services [MG-70-19-0057-19].

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