Whiting Ranch, 1-19-14. © Ron Vanderhoff.

Flatspine Burr Ragweed (Annual Burrweed, Annual Bur-sage)

Ambrosia acanthicarpa

Native to California

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Santiago Creek, Hart & Santiago Park, 11-26-17. © Ron Vanderhoff.
Santa Ana River, S side nr. Gypsum Cyn. Rd., 6-4-15. © Ron Vanderhoff.

San Diego Creek Channel, nr. Audubon Hdqtrs., 7-9-17. © Ron Vanderhoff.
Whiting Ranch, 1-19-14. © Ron Vanderhoff.

Parthenium hysterophorus, Ambrosia acanthicarpa, San Diego Creek Channel, Campus to Michelson, 9-1-16. © Ron Vanderhoff.