California swamp thistle (Cirsium douglasii)

California swamp thistle, a reference photo — Photo: Elaine with Grey Cats from Mountain View, CA, USA · CC BY-SA 2.0 (licence)

Cirsium douglasii is a species of thistle known by the common names Douglas' thistle and California swamp thistle.

Is it poisonous?

We have no record of California swamp thistle being toxic, poisonous or venomous. That is not proof that it is safe. Never eat, touch or handle a wild plant, mushroom or animal on the strength of an identification; ask someone qualified.

Easily confused with

Cirsium barnebyi
Cirsium mohavense

Classification

Kingdom: Plantae
Phylum: Tracheophyta
Class: Magnoliopsida
Order: Asterales
Family: Asteraceae
Genus: Cirsium
Species: Cirsium douglasii

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