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Asclepias tuberosa, a dicot, is a shrub that is non-native to California.
Recognized as current in TJM2 + PLANTS + JM93
Los Angeles, Sacramento, Shasta
See a detailed Distribution Grid of this plant in Calfornia.
Links: USDA Plants Profile | Jepson Herbarium
Website references on Google
Bloom Months(Blooming months in blue)