Barbara's Lake, Laguna Coast Wilderness Park, Orange County, CA. 9-11-11. © Ron Vanderhoff.

Grand redstem

Ammannia robusta

Distributed over most of North America

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Flood basin off E Yale nr Springbrook, Irvine, Orange County, CA. 8-9-12. © Ron Vanderhoff.

Flood channel, San Mateo Park to I405, Irvine, Orange County, CA. 9-15-18. © Ron Vanderhoff.

Santa Ana River, Lakeview to Tustin Ave., Orange County, CA. 9-2-12. © Ron Vanderhoff.

Santa Ana River, Tustin Ave. to Imperial, Orange County, CA. 10-25-18. © Ron Vanderhoff.