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FOC | Family List | FOC Vol. 13 | Lythraceae

1. Ammannia Linnaeus, Sp. Pl. 1: 119. 1753.

水苋菜属 shui xian cai shu

Authors: Haining Qin & Shirley A. Graham

Herbs, annual, tending to become anthocyanic with age. Stems erect, glabrous; young branches often 4-angled or narrowly winged. Leaves opposite, usually decussate, sessile or subsessile, membranous. Inflorescences cymose, with small, white, membranous bracteoles. Flowers 4(-6)-merous, actinomorphic. Floral tube campanulate or urceolate, becoming globose or nearly so in fruit, 4(-6)-lobed, noticeably 4-8-veined; sepals short, less than 1/3 length of floral tube; epicalyx segments between sepals small or absent. Petals absent to 4, caducous. Stamens 2-8. Ovary incompletely [1 or]2-4-loculed, globose; ovules numerous; style much shorter to much longer than ovary, style base persistent in fruit; stigma capitate. Capsule globose, hyaline, smooth walled, not finely striated, irregularly dehiscing from apex. Seeds many, golden-brown, obovoid, concave-convex, ca. 1 mm. 2n = 18, 24, 26, 28, 30, 32, 34, 36, 40, 48, 66.

About 25 species: widely distributed in tropical and subtropical areas, mainly in Africa and Asia; four species (one naturalized) in China.

1 Leaves basally attenuate to truncate; petals absent; style shorter than ovary.   1 A. baccifera
+ Leaves basally ± auriculate, often clasping; petals present   (2)
2 (1) Style ca. 1/2 as long as ovary or shorter; capsule ca. 1.5 mm in diam..   2 A. multiflora
+ Style ca. as long as ovary or longer; capsule 1.5-3.5 mm in diam   (3)
3 (2) Capsule 1.5-3.5 mm in diam.; flowers 3-15, commonly 7, in axillary cymes.   3 A. auriculata
+ Capsule 3.5-5 mm in diam.; flowers 3-5, commonly 3, in axillary cymes.   4 A. coccinea

Lower Taxa


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