特徵描述
作者
HUANG, TSENG-CHIENG
型態特徵
Herbs, shrubs or trees; branches often quadrangular. Leaves opposite or whorled, seldom altenate, entire; stipules 0. Flowers bisexual, regular or rarely irregular, mostly axillary, solitary or in cymes or panicles; calyx-tube free, persistent, the lobes 3–6, valvate, often with accessory lobes; petals as many as calyx-lobes and inserted at the mouth of calyx, imbricate, or rarely 0; stamens few or many, inserted on the calyx; ovary superior, sessile or stalked, 2–6- or rarely 1-celled, with many, seldom few, ovules in each cell; style simple, the stigma capitate, rarely 2-lobed. Fruit a dehiscent or indehiscent capsule, free or adnate to the base of calyx, 2–6-celled or 1-celled by the imperfection of the partitions; seeds many, various in shape; endosperm 0; embryo straight.
屬
More than 20 genera, widely distributed but most abundant in tropical America; five genera in Taiwan.
參考文獻
Ammannia 水莧菜屬
作者
HUANG, TSENG-CHIENG
型態特徵
Herbs of wet places or aquatic; stems and branches often 4-angled; leaves opposite; inflorescence cymose, with small, white membranous bracteoles; flowers 4(–6)-merous; stamens 2–8, inserted inside the tube; calyx-tube campanulate or urceolate; petals caduous or none; ovary 1- or incompletely 2–4-locular; capsules irregularly dehiscent; seeds numerous.
