Staminate (male) flower heads. Upper Newport Bay, Nature Ctr. to Jamboree, 7-12-12. © Ron Vanderhoff.

Western ragweed
(Cuman ragweed, perennial ragweed)

Ambrosia psilostachya

The inflorescence is borne on a spike at the top of the stem. The plant is monoecious, with the inflorescence carrying both staminate (male) flower heads at the top and the pistillate (female) heads below and in the axils of leaves.

Native to California

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