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Northern Prairie Wildlife Research Center

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Aquatic and Wetland Vascular Plants of the Northern Great Plains

30. Lythraceae, the Loosestrife Family

1. Ammannia L. -- Toothcup

1. Ammannia auriculata Willd.

Slender annual 0.5-5(8) dm tall, simple or branched above the base, the branches ascending. Leaves linear-lanceolate to linear-oblong, 1-4(6.5) cm long, 1.5-6(10) mm wide, auriculate-clasping at the base. Inflorescences of simple to compound, rather open cymes, peduncled from the axils, with (1)3-12(15) flowers per axil, most with at least 7 flowers; peduncles filiform, 3-9 mm long; pedicels 1-3(6) mm long. Calyx tube 1-3 mm long in flower, the lobes alternating with short appendages or the appendages absent; petals 4, deep rose-purple, ca. 1.5 mm long; stamens 4(-8), anthers deep yellow when fresh; styles 1-3 mm long in fruit. Capsules 1.5-3 mm in diameter, equaling or exceeding the calyx. Jul--Oct. Muddy shores, flats and low spots in fields where water stands temporarily; uncommon, ec SD and s NE; (IN to SD, s to TX and into Mex., C. and S.Amer.; Old World tropics).
GIF- Distribution Map

Map key

Return to Family -- Lythraceae - The Loosestrife Family
Next Species -- Ammannia coccinea Rottb.

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