Amaranthaceae

莧科

APG 4

Amaranthaceae 莧科

特徵描述

屬列表

標本列表

特徵描述

作者

LIU, TANG-SHUI and KAO, MUH-TSUEN

型態特徵

Erect, prostrate or scandent annual or perennial herbs, rarely undershrubs. Leaves alternate or opposite, simple, entire or obsoletely serrate-dentate, extipulate. Flowers small, greenish, white, pink, rarely yellow, actinomorphic, usually bisexual, in spikes, heads, racemes or panicles; bracts and bracteoles often scarious, the bracteoles sometimes hooked; perianth segments 3–5, free or nearly so, imbricate, more or less dry and membranaceous, mostly falling with fruit, rarely persistent; stamens as many as and opposite the perianth segments, hypogynous, filaments usually united at base into a cup or tube, often with staminodes between them, anthers 1 or 2-celled; ovary of 2 or 3 united carpels, superior, 1-celled, with 1 to many ovules on a basal funicle, the style present or not, stigma capitate or 2 or 3-fid. Fruit mostly an utricle or a circumscissile capsule, rarely a berry or drupe; seeds often lenticular, smooth; embryo annular, surrounding the mealy endosperm.

屬

Genera about 64, with about 800 species mainly in the tropical regions of the world; nine genera with 19 species, including some introduced ones, in Taiwan.

參考文獻

LIU, TANG-SHUI and KAO, MUH-TSUEN, Flora of Taiwan, second edition 2: 388. 1996. (Fl. Taiwan 2nd edit.)

Amaranthus 莧屬

作者

HSIEH, CHANG-FU and HSIEH, TSUNG-HSIN

型態特徵

Monoecious, erect or prostrate, sometimes spinous, annual herbs; stems branched, glabrous or pubescent. Leaves petiolate, alternate, entire, penninerved. Flowers unisexual, or polygamous, small, green, occasionally white or purplish, clustered; clusters axillary or terminal spikes or panicles; bracts often tipped with spines, sometimes minute; bracteoles 2; perianth-segments 3 or 5, rarely 4, membranaceous, glabrous; stamens 2–5, filaments free, anthers 2-celled; ovary ovoid, with an erect ovule, style very short, stigmas 2–4, filiform. Utricles laterally compressed, indehiscent or circumscissile; seed solitary, lenticular, shining, smooth, with annular embryo.