Calflora, a 501c3 non-profit
Distribution by County   11036    
Polygonum ramosissimum  Michx.  ssp. prolificum  (Small) Costea & Tardif
Bushy knotweed
Polygonum ramosissimum ssp. prolificum is an annual herb that is not native to California.

Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. [web application]. 2023. Berkeley, California: The Calflora Database [a non-profit organization]. Available:   (Accessed: 04/01/2023).