特徵描述
作者
YANG, YUEN-PO and LU, SHENG-YOU
型態特徵
Deciduous trees or shrubs; buds with scales. Leaves alternate, simple, serrate, rarely entire, penninerved, often oblique at base, petiolate; stipules paired, usually fugacious, caducous. Flowers unisexual or bisexual, solitary or in clustered cymes, racemes, panicles, or fascicles, apetalous; calyx 4 or 5-parted; stamens as many as and opposite calyxlobes, rarely twice as many; filaments straight; anthers extrorse, 2-celled, longitudinally dehiscent; ovary superior, sessile or stipitate; usually 1-celled; ovule 1, pendulous, anatropous or amphitropous; styles 2, simple or bifurcate. Fruit a samara, nut or drupe; seeds with scanty or no endosperm; embryo straight or curved.
屬
About 15 genera and more than 150 species, in tropical and temperate regions. Five genera with 15 species in Taiwan.
參考文獻
Zelkova 櫸屬
作者
YANG, YUEN-PO and LU, SHENG-YOU
型態特徵
Deciduous trees or shrubs. Leaves alternate, crenate to serrate, penninerved; stipules free. Inflorescences on young branches; staminate flowers 2-5-clustered in axils of lower leaves; calyx broadly campanulate, 4 or 5-lobed; stamens 4 or 5. Bisexual flowers solitary or few in axils of upper leaves; calyx 4 or 5-lobed; stamens 4 or 5; ovary sessile; ovules pendulous. Drupe dry, oblique, subglobose to carinate; seeds without endosperm, cotyledons broad.
