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12b. Equisetum variegatum subsp. alaskanum (A. A. Eaton) Hultén, Acta Univ. Lund. 37(1): 59. 1941.
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.
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