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

43. Callitrichaceae, the Water Starwort Family

1. Callitriche L. -- Water starwort

3. Callitriche verna L.


Submersed or occasionally amphibious aquatic, sometimes growing on mud, with stems 0.5-2 dm long. Leaves typically of 2 types; submersed leaves mostly linear, 5-20 mm long, 0.3-1 mm wide, shallowly bidentate at the tip, clasping at the base with a ridge or narrow, membranous wing connecting the leaf bases; floating leaves seldom absent, mostly in terminal rosettes, obovate to oblanceolate or spatulate, 3-10 mm long, 1.5-5 mm wide, 3- to 5-nerved, rounded at the tip, tapered to a flat petiole and connected by a ridge at their bases; leaves transitional between the submersed and floating leaves usually present. Flowers subtended by a pair of hyaline bracts, these soon deciduous. Fruits higher than wide, 0.8-1.7 mm long, 0.6-1.4 mm wide, narrowly wing-margined at least toward the summit, pitted in longitudinal rows. Jun--Sep. In the same habitats as C. hermaphroditica, sometimes stranded and persisting on mud; occasional in ND, e and the Black Hills in SD, rare in c NE; (Circumboreal, in N.Amer. s to WV, OH, IL, IA, KS, NM and CA). C. palustris L.
GIF- Species Photo/Drawing
GIF- Distribution Map

Map key

Callitriche verna, with closeup of fruits.  

Previous Section -- Callitriche heterophylla Pursh
Return to Family -- Callitrichaceae - The Water Starwort Family

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/cver.htm
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 06:42:02 EST
Sioux Falls, SD [sdww54]