Polygonum douglasii
Greene
ssp. johnstonii
(Munz) J. C. Hickman
Johnston's knotweed, Knotweed
Not an active name
Polygonum douglasii ssp. johnstonii is an annual herb that is native to California, and also found elsewhere in western North America.
Bloom Period
The blue points on the map indicate observations in Calflora.
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Click on the map to view observations within a specific county.
Occurs usually in non wetlands, occasionally in wetlands
