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

2. Callitriche heterophylla Pursh

Submersed aquatic or seldom stranded on mud, with stems 0.5-2 dm long. Leaves usually of 2 basic types, with linear, submersed leaves below on the stems and obovate to spatulate floating leaves upward, the leaves seldom all of one type; submersed leaves 10-20 mm long, 0.5-1.2 mm wide, 1-nerved, bidentate at the tip, the pairs connected at their bases by a ridge or narrow wing; floating leaves in terminal rosettes or partly scattered along the stem, 6-15 mm long, 3-7 mm wide, 3- to 5-nerved, rounded at the tip, attenuate to the base, connected at their bases like the linear leaves, the transition from submersed to floating leaf types gradual. Flowers subtended by a pair of hyaline bracts, these deciduous. Fruits 0.6-1.2 mm long, about as wide, slightly broader toward the tip than the base, the segments convex on the face and rounded on the back, not wing-margined, irregularly pitted on the surface. Jun--Sep. Shallow water or mud of springs and stream pools; rare, with collections from Lawrence and Harding Cos., SD, also w MN; (N.S. to s MN and w SD, s to FL and TX; also w MT to WA, s to CA and C.Amer.).
GIF- Distribution Map

Map key

Previous Section -- Callitriche hermphroditica L.
Return to Family -- Callitrichaceae - The Water Starwort Family
Next Section -- Callitriche verna L.

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 06:41:20 EST
Sioux Falls, SD [sdww55]