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.)

Ludwigia 水丁香屬

作者

RAVEN, PETER H. and PENG, CHING-I

型態特徵

Herbs, shrubs, or small trees, mostly of wet places, sometimes floating in open water. Leaves alternate (in Taiwan) or opposite, rarely whorled; stipules present, caducous. Flowers (3-)4–5(–7)- merous, in axils of reduced leaves. Floral tube absent, the sepals persistent after anthesis, sepals (3-)4–5(–7); petals as many as the sepals or absent, yellow or in a few species white, not deeply notched. Stamens as many as or twice as many as the sepals; pollen shed singly or in tetrads. Ovary with as many locules as the sepals, the seeds numerous in each locule. Capsules dehiscent or indehiscent.