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

51. Alismataceae, the Water Plantain Family

3. Sagittaria L. -- Arrowhead, duck potato

5. Sagittaria latifolia Willd.

Emergent to emersed perennial 2-8 dm tall, or much longer when growing in deep water, rhizomatous and with tubers in autumn. Leaves highly variable depending on water depth, emersed leaf blades sagittate, mostly 8-40 cm long, 0.4-15 cm wide, the lobes narrow and linear on plants of deep water to broadly deltoid on emersed specimens, the basal lobes shorter to longer than the terminal one; submersed phyllodes, if produced, apparently gone by flowering time. Inflorescences 1-few, simple or rarely branched from the lowest node; bracts bluntly acute to obtuse, 0.5-1 cm long; pedicels slender, 0.3-3.5 cm long, ascending to spreading. Flowers male above and female below or seldom all of one sex; sepals ovate, 4-10 mm long, broadly rounded, reflexed in fruit; petals white, 7-20 mm long; filaments glabrous, longer than the anther. Fruiting heads globose to somewhat flattened, 1-2.5 cm across; achenes 2.5-4 mm long, dorsal wing rounded over the top of the achene, ventral wing gradually widened upward to meet the beak; beak projecting horizontally, tapered, 1-1.5(2.5) mm long. Jul--Sep. Mud or shallow water of rivers, streams, lakes and marshes; frequent in e ND, e and s SD and NE; (N.S. and Que. to B.C., s to S.Amer.).

Many records of S. latifolia for the w and c parts of ND and SD and e WY are based upon misidentifications of S. cuneata.

GIF- Distribution Map

Map key

Previous Section -- Sagittaria graminea Michx.
Return to Family -- Alismataceae - The Water Plantain Family
Next Section -- Sagittaria rigida Pursh

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 06:47:18 EST
Sioux Falls, SD [sdww54]