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Distribution by County 6735 |
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Polygonum amphibium L.
var. emersum Michx.
(not an active name) Kelp, Longroot smartweed, Swamp knotweed, Water smartweed
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Polygonum amphibium var. emersum is a perennial herb (aquatic) that is native to California, and also found elsewhere in North America and beyond.
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Record Count by County
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Suggested Citation
Calflora:
Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals,
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