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

66. Pontederiaceae, the Pickerelweed Family

2. Zosterella Small

1. Zosterella dubia (Jacq.) Small -- Water stargrass

Usually submersed or partly floating perennial with lax stems and leaves, or occasionally stranded and forming tiny leafy rosettes on exposed mud or sand. Stems slender, elongate, freely branched, often rooting at the lower nodes, to 1 m long. Leaves alternate, sessile, stipitate, linear, obtuse to rounded or apiculate at the tip, 2-10(15) cm long, 2-5(7) mm wide, several-nerved, the midvein and others inconspicuous, stipular-winged at the base but not sheathing the stem. Flowers solitary in upper leaf axils, the membranous spathe surrounding the perianth tube for much of its length, 10-15 mm long, cuspidate to caudate at the apex; perianth tube slender, often curved, 15-35(70) mm long, the perianth segments pale yellow, linear, 4-6 mm long; stamens alike. Jun--Sep. Streams, lakes, ponds and impoundments; occasional in the e and c parts, especially in tributaries of major rivers; (Que. to ND and WA, s to FL, TX, CA and into Mex.). Heteranthera dubia (Jacq.) MacM.

Zosterella dubia.

Map key

Previous Section -- Heteranthera limosa (Sw.) Willd.
Return to Family -- Pontederiaceae - The Pickerelweed Family

Accessibility FOIA Privacy Policies and Notices

U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/plants/vascplnt/species/zsma.htm
Page Contact Information: Webmaster
Page Last Modified: Thursday, 03-Aug-2006 11:46:35 EDT
Menlo Park, CA [caww55]