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

Pontederiaceae - The Pickerelweed Family


Aquatic or amphibious annuals and perennials with short to elongate stems. Leaves alternate, sessile and straplike or differentiated into petiole and expanded blade, membranous-sheathing at the base in the latter instance. Flowers solitary (in those included here) from the axils, subtended by a sheathing spathe, pale yellow or white to purplish-blue, perfect, regular, hypogynous; perianth of 6 petaloid lobes, united below into a tube, salverform; stamens 3 (in ours), all alike or 1 unlike the other 2, the filaments adnate to the throat of the perianth tube; pistil 3-carpellary, stigma 3-lobed, style 1, ovary incompletely 3-celled by intrusion of the parietal placentae. Fruit a many-seeded, often indehiscent capsule retained inside the spathe; seeds conspicuously ribbed.

Lead Characteristic Go To
1 Leaves differentiated into petiole and expanded blade, emersed or floating; flowers white to purplish-blue Genus Heteranthera
1 Leaves linear, straplike, not differentiated into petiole and blade, usually submersed; flowers light yellow Genus Zosterella

66. Pontederiaceae, the Pickerelweed Family
1. Heteranthera R. & P. -- Mud plantain
1. Heteranthera limosa (Sw.) Willd.
2. Zosterella Small
1. Zosterella dubia (Jacq.) Small -- Water stargrass


Previous Section -- Typhaceae - The Cattail Family
Return to Contents
Next Section -- Liliaceae - The Lily 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/famponte.htm
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 06:37:28 EST
Reston, VA [vaww54]