Cold Springs Cyn, Orange County, CA. 5-27-10. © Ron Vanderhoff.

Field Horsetail
(Oblivion Horsetail, Common Horsetail)

Equisetum arvense

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San Juan Creek, old bridge to 2.2 mi E. Orange County, CA. 9-18-11. © Ron Vanderhoff

Cold Springs Cyn, Orange County, CA. 5-27-10. © Ron Vanderhoff.

Female frond. San Juan Cr. and base Lion Cyn., 6-6-13. © Ron Vanderhoff.

Male frond. San Juan Cr. and base Lion Cyn., 6-6-13. © Ron Vanderhoff.

San Juan Creek, nr. Hot Springs, 7-4-16. © Ron Vanderhoff.

Fertile frond, Side Cyn, 2.5 rd. mi. E Hot Spr. Cyn. Rd., 1-20-13. © Ron Vanderhoff.

Fertile frond, Side Cyn, 2.5 rd. mi. E Hot Spr. Cyn. Rd., 1-20-13. © Ron Vanderhoff.

Fertile frond, Side Cyn, 2.5 rd. mi. E Hot Spr. Cyn. Rd., 1-20-13. © Ron Vanderhoff.