EQUISETACEAE (Horsetail family)

Equisetum arvense L. field horsetail [US; Arizona; Yavapai County; Prescott; T13N, R2W, S9; 5,490 feet][along Granite Creek at base of Kuhne Hill (across road from entrance to Haisly Homestead); May 5, 1993; Collected & identified by Chuck Walker; #AZ72]

Equisetum hyemale var. affine (Engelm.) A.A. Eat. scouringrush horsetail [US; Washington; Spokane County; T26N, R44E, S35; 1,960 feet][in ditch along Forker Rd, about 1/2 mile from East #206; April 8, 1998; Collected & identified by Chuck Walker; #WA12]

Equisetum laevigatum A.Braun smooth horsetail [US; Arizona; Yavapai County; Prescott; T13N, R2W, S9; 5,490 feet][along Granite Creek at base of Kuhne Hill (across road from entrance to Haisly Homestead); May 5, 1993; Collected & identified by Chuck Walker; #AZ73]

Equisetum sylvaticum L. woodland horsetail [US; Minnesota; Saint Louis County, Cherry; T57N, R19W, S26; 1,350 feet][along Highway 25, 1/4 mile south of Cherry; June 3, 1997; Collected & identified by Chuck Walker; #MN19]

Equisetum telmateia Ehrh. var. braunii (Milde) Milde giant horsetail [US; California; Humboldt County; T11N, R1E, S35; 41 deg. 17.416'N, 124 deg. 1.686'W; 80 feet][along Redwood Creek Trail, east side of Highway #101, about two miles northeast of Orick; April 14, 2005; Collected & identified by Chuck Walker; #CA170]