Onagraceae

柳葉菜科

APG 4

Onagraceae 柳葉菜科

特徵描述

屬列表

標本列表

特徵描述

作者

RAVEN, PETER H. and PENG, CHING-I

型態特徵

Annual, biennial or perennial herbs, sometimes woody. Leaves basal or cauline, alternate or opposite, simple, entire or toothed (rarely lobed); stipules minute or absent. Flowers actinomorphic or zygomorphic, in leaf axils or in inflorescences, generally bisexual (all in Taiwan), 2–7-merous; floral tube present or absent; stamens as many as or twice as many as the sepals; anthers versatile; pollen shed singly or in tetrads, connected by viscin threads; ovary inferior; style single; stigma 4-lobed, clavate or globose. Fruit a capsule, berry, or nut, loculicidal or indehiscent. Seeds anatropous, lacking endosperm, smooth or with tubercles or scales, some with a coma or wings.

屬

Fifteen genera and about 650 species, worldwide but with most genera present in western North America. All four genera that occur as native plants in the Old World have representatives in Taiwan, and a total of 22 species (plus one hybrid) of Onagraceae occur in Taiwan.

參考文獻

RAVEN, PETER H. and PENG, CHING-I, Flora of Taiwan, second edition 3: 937. 1993. (Fl. Taiwan 2nd edit.)

Epilobium 柳葉菜屬

作者

LIEVENS, ALAN W. and HOCH, PETER C.

型態特徵

Perennial herbs, often flowering the first year, or sometimes annual (not in Taiwan) or woody, perennating by leafy rosettes, stolons, soboles, turions, axillary buds, or spreading lateral roots (the latter two modes not in Taiwan). Stems erect, ascending, or decumbent, glabrous to densely pubescent and/or glandular, often with raised lines of hairs decurrent from the margins of the petioles. Leaves sessile to petiolate, generally opposite below (rarely whorled) to alternate on inflorescence, subentire to denticulate; stipules absent. Flowers in loose bracted racemes (or panicles), 4-merous, generally actinomorphic, rose-purple or white (elsewhere rarely red-orange or cream); floral tube present; sepals 4, erect; petals 4, generally apically notched; stamens 8; pollen shed in tetrads (or monads, not in Taiwan); stigma entire (clavate to capitate) to 4-lobed. Fruit an elongate, slender, 4-loculate, subterete capsule, readily dehiscent. Seeds generally in 1 row per chamber, mostly narrowly obovoid, each with a coma (absent in a few non-Taiwanese taxa). 2n=24, 26, 30, 32, 36, 60, 72, 108; all species counted in Taiwan have 2n=36.