Crassulaceae

景天科

APG 4

Crassulaceae 景天科

特徵描述

屬列表

標本列表

特徵描述

作者

TANG, WEI-SHIN and HUANG, TSENG-CHIENG

型態特徵

Annual or perennial, erect, ascending or prostrate, occasionally scandent, mostly succulent herbs, without milky latex. Leaves alternate, opposite or whorled, usually simple, entire, serrate, lobed to pseudo-pinnate, pinnately or palmately nerved, fleshy, exstipulate. Flowers mostly in terminal cymes, rarely solitary or in spikes, corymbs or panicles, bisexual, rarely unisexual, actinomorphic, mostly bracteate; sepals 3–5 or more, generally distinct or sometimes connate into a distinct broad tube, marcescent after anthesis; petals of same number as sepals, distinct or sometimes connate at base; stamens typically in 2-whorls (1-whorled sometimes absent), usually as many or twice as many as petals, generally hypogynous, distinct or adnate to petals or corolla-tube, the filaments free, rarely connate; anthers 2-celled, dehiscent longitudinally, introrse; gynoecium of 3 or more distinct or basally connate carpels (carpels usually as many as petals), superior, each mostly substended by a hypogynous scale-like nectariferous gland or rarely absent, 1-loculed, the ovules many or rarely few. Fruit follicular, membranaceous or coriaceous, dehiscent on adaxial side; seeds small, with straight embryo and usually fleshy and scanty endosperm.

屬

Thirty-five genera with 1,500 species widely distributed over the world except Australia; four genera in Taiwan.

參考文獻

TANG, WEI-SHIN and HUANG, TSENG-CHIENG, Flora of Taiwan, second edition 3: 10. 1993. (Fl. Taiwan 2nd edit.)

Sedum 佛甲草屬

作者

TANG, WEI-SHIN and HUANG, TSENG-CHIENG

型態特徵

Herb, glabrous, rarely hairy, annual or perennial, rarely low under shrubby, fleshy. Leaves simple, alternate or rosulate, rarely opposite or verticillate, entire or toothed, rarely spine-tipped, flat or cylindric, usually sessile. Flowers bisexual, rarely unisexual by abortion, sometimes dioecious, in terminal cymes or solitary, rarely in spikes, yellow or white; sepals 4–5, distinct or few connate at base; petals as many as sepals, free, persistent; stamens as twice as sepals, perigynous, the filaments subulate or filiform, often adnate to petals; nectariferous glands 5 or 4, minute; carpels 5, sometimes 4, free or shortly connate at base; style short, with stigma at apex; ovules rather many. Follicles 4–5, free, mostly with many seeds.