USGS - science for a changing world

Northern Prairie Wildlife Research Center

  Home About NPWRC Our Science Staff Employment Contacts Common Questions About the Site

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.

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/plants/vascplnt/species/aaur.htm
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 06:39:37 EST
Reston, VA [vaww55]