Equisetum variegatum var. alaskanum A.A. Eaton in Merriam, Harriman Alaska Exped. 5: 390. 1904

Stems 26--55 cm; teeth all black or with obscure white margins, 8--14, incurved.

Cones maturing in late summer, or cones overwintering and shedding spores in spring. Lakeshores, riverbanks, ditches, wet woods, tundra; 0--1500 m; B.C., Yukon; Alaska including the Aleutian Islands, Wash.