Aquatic and Wetland Vascular Plants of the Northern Great Plains
57. Najadaceae, the Naiad Family
1. Najas L. -- Naiad2. Najas guadalupensis (Spreng.) Magnus. -- Southern naiad
Plants monoecious; stems branching, 10-30 cm long. Leaves linear, acute, minutely spinulose, 1-2 cm long, 0.4-0.8 mm wide; fascicles of smaller leaves appearing in the axils. Achenes brown or purplish, the beak 0.5 mm or less long at maturity. Seeds 2-3 mm long, 1/4 as thick, the seed coat rather dull, coarsely reticulate, with 10-20 rows of pits across the middle. Jul-Sep. Shallow water of marshes, ditches, lakes and impoundments; frequent over most of SD, NE and e WY, otherwise rare; (MA and s Que. to MN, ND, WY and OR, s to Mex., C. and S.Amer.).
 Najas guadalupensis |
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