Aquatic and Wetland Vascular Plants of the Northern Great Plains
60. Lemnaceae, the Duckweed Family
3. Wolffia Horkel -- Water-meal2. Wolffia columbiana Karst.
Fronds orbicular to broadly ovoid when viewed from above, 0.7-1.4 mm long, with a small, flattened upper surface, otherwise nearly globose or ovoid when viewed from the side, not raised and pointed at the apex, green throughout and not brown-punctate. Calm, fresh water; extreme e ND, s SD and NE; (ME to Ont. and ND, s through the e and c U.S. and into Mex. and n S.Amer.; also CA).
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