Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
30. Lythraceae, the Loosestrife Family
1. Ammannia L. -- Toothcup
2. Ammannia coccinea Rottb.
Erect, simple or freely branched annual 0.5-5(10) dm tall, the branches ascending,
or basal branches, when present, spreading. Leaves linear-lanceolate
to linear-oblong or rarely elliptic to spatulate, 2-8 cm long, 2.5-15 mm wide,
auriculate or cordate and clasping at the base or cuneate on lowermost leaves.
Inflorescences of rather compact, axillary cymes, nearly sessile to pedunculate,
with (1)3-5(-14) flowers per axil; peduncles stout, to 9 mm long; pedicels
to 2 mm long. Calyx tube (2.5)3-5 mm long, the lobes alternating
with thickened appendages of about the same length; petals 4(5), deep
rose-purple, sometimes with a deep purple midvein at the base, ca. 2 mm long;
stamens 4(-7), anthers deep yellow when fresh; styles 1.5-3 mm
long in fruit. Capsules 3.5-5 mm in diameter at maturity, equaling to
exceeding the calyx. Jul--Oct. Exposed mud of ponds, marshes and stream banks;
uncommon and scattered from ec SD, s into NE; (OH to SD, s to KY and TX; also
CA, Mex., C.Amer., n S.Amer. and islands of the Caribbean).
See the discussion under the following.
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