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

Introduction to Vascular Plants


© Jamie Fenneman     (Photo ID #5134)


E-Flora BC Static Map

Distribution of Ammannia robusta
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Species Information

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.

SourceThe Illustrated Flora of British Columbia


If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Habitat and 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.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Ammannia coccinea Rottb.
Ammannia coccinea subsp. robusta (Heer & Regel) Koehne
Ludwigia scabriuscula Kellogg