Ammannia auriculata

Erect, 1-3 dm, pyramidally branched, with short ascending branches beginning above the base; lvs membranous, linear or lance-linear, 1.5-5 cm, cuneate to a barely auriculate sessile base; cymes 3-15-fld, on slender axillary peduncles 4-10 mm; pedicels 1-3 mm; fls small, the hypanthium at an thesis mostly 1.5-2.5 mm, the caducous pet mostly 1-2 mm, deep rose-purple; anthers 4, yellow; sep triangular, shortly surpassed by the fr, this 2-3.5 mm thick; style persistent, 1.5-3 mm; ovary and fruit 4-locular; 2n=32. Borders of ponds, and similar wet places; N.D. to Tex., and irregularly pantropical, perhaps not entering our range, most of our plants so identified in the past being extremes of no. 2. [Ammannia coccinea Rottb.] July-Oct.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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