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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.


[Annual] perennial herb, aquatic to terrestrial. Stem: prostrate or ascending; hairs simple. Leaf: opposite, subsessile to short-petioled, blade margins entire to serrate. Inflorescence: axillary or axillary and terminal, sessile or peduncled, many-flowered cylindric spikes or spheric heads; bracts and bractlets persistent, scarious. Flower: bisexual; perianth parts 5, free, ± equal or not, scarious, persistent, white, glabrous or woolly; stamens 3–5, fused at base into short tube or cup, anthers 2-chambered; pseudostaminodes 5, alternate with stamens; ovary obovoid to ± spheric; style short, ± 0.2 mm; stigma spheric (2-lobed), ovule 1, pendent. Fruit: indehiscent; fruit wall membranous. Seed: 1, lenticular or ovoid-oblong, ± red brown, smooth, shiny.
± 170 species: generally tropical America. (Latin: alternating pseudostaminodes and stamens) Alternanthera sessilis (L.) DC. occasionally a greenhouse weed <WEEDINESS SYMBOL 1>; Alternanthera ficoidea (L.) P. Beauv. var. bettzickiana (Regel) Backer widely cultivated, California reports unconfirmed.

Key to Alternanthera

1. Stem not hollow; inflorescence axillary, sessile; perianth parts woolly ..... A. caracasana

1' Stem hollow; inflorescence axillary and terminal, peduncled; perianth parts glabrous ..... A. philoxeroides


Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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