Northern Prairie Wildlife Research Center
Figure 2. Distribution of Vallisneria americana in North America: bisexual populations with solitary female flowers (solid circles),umbel or spike like inflorescences (triangles), and representative unisexual or sterile collections (open circles; Lowden 1982).
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/plants/wildcel/fig2.htm
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