Habit: Annual.
Stem: prostrate to erect, branched or not, glabrous.
Leaf: opposite, sessile, linear to lanceolate [oblanceolate], with basal ear-like lobes.
Inflorescence: axillary 1--5(14)-flowered cymes.
Flower: radial, hypanthium bell- to urn-shaped, 4--8-ribbed; sepals 4, epicalyx lobes <= sepals, horn-like, thick; petals (0)4, obovate; stamens 4(5--12), exserted (included); style long, slender [short, stocky].
Fruit: capsule, +- spheric, wall smooth, not striate at 10×, thin, dry, splitting irregularly.
Seed: many, +- 1 mm.
Species In Genus: +- 25 species: temperate, tropics.
Etymology: (Paul Ammann, 1634--1691, director of medical garden, University of Leipzig, author of flora of Leipzig area, 1675)
Jepson eFlora Author: Shirley A. Graham
Reference: [Graham et al. 2011 Bot J Linn Soc 166:1--19]
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)Key to Ammannia
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