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(Upload on August 31 2009) [ 日本語 | English ]

Equisetum L. (トクサ) Spelled silvaticum in Hultén (1968) Fusasugina (フサスギナ, 房杉菜), woodland horsetail Lifeform: a bushy, perennial, and rhizomatous horsetail Distribution: circumboreal (North America - Eurasia) → cool temperate zones Plants tend to be larger in Eurasia than in America Japan: sporadically distributed in Hokkaido → RDB (VU)

Habitat: mainly lowland wet conifer forests with nitrogen-poor soil (common after wildfire (森林火災) in interior Alaska) Utilization: gardening Varieties (discarded in USDA): var. sylvaticum: with scabrous branches var. pauciramosum Milde.: smooth branches, slightly branched f. multiramosum Fernald: smooth branches, copiously branched

Equisetum sylvaticum in Alaska

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1 2 3 4
[1/4] near a river at the entrance of Calibou Poker Creeks on August 17 2009. This species appears frequently soon after wildfires. [2/3] at a garden of Yoshikawa, Fairbanks, on August 10 2012.