E-Flora BC: Electronic Atlas of the Flora of British Columbia

Ammannia robusta Heer & Regel
scarlet ammannia (grand redstem)
Lythraceae (Loosestrife family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #5134)

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Distribution of Ammannia robusta
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Species Information

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Annual herb from spreading roots; stems erect to decumbent, solitary, simple or branched at the bases, 5-40 cm tall.
Basal leaves lacking; stem leaves usually opposite, unstalked, oblong-lanceolate, 2-4 cm long, 2-8 mm wide, heart-shaped and clasping at the base, glabrous.
Inflorescence of 2-5, rarely 1, urn-shaped flowers in compact axillary clusters; petals usually 4, purplish, 3-4 mm long; styles at least 1 mm long, slightly exserted from the 4-toothed calyx.
Capsules, membranous, nearly round, about 4 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Wet sandy lakeshores and ponds in the steppe zone; rare in SC BC, known only from the Osoyoos area; disjunct to ON and S to MN, IL, OH, FL, TX, NE, CA and MX.

Source: The Illustrated Flora of British Columbia


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Ammannia coccinea Rottb.
Ammannia coccinea subsp. robusta (Heer & Regel) Koehne
Ludwigia scabriuscula Kellogg

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References