(First upload on July 28 2009. Last on June 26 2017) [ 日本語 | English ]

Equisetum hyemale L.

Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

Equisetum L. (トクサ)
Tokusa (トクサ, 木賊/砥草), rough horsetail

Medical name: 木賊(モクゾク): adstriction, hemostate (decoction), ophthalmopathy (irrigation)

Lifeform: rhizomatous perennial evergreen fern ↔ E. fluviatile = summergreen
Distribution: widespread in holarctic region (including northern Japan)
Habitat: shady, mesic forests

Field training on integrated environmental research (統合環境調査法実習) (fauna and flora 種リスト)
HUSTEP: Plants and Plant communities in Japan (flora list)

Body: rich in silica
Chromosome number: 2n = 216

Equisetum hyemale L. var. ramosum Honda (discarded)

Varieties (temporal)
var. schleicheri Milde (ハマドクサ), sheath length > stem diameter
var. affine (Engelm.) Eaton (East Asia - North America)
var. ramosum Honda (エダウチトクサ)
f. variegatum Hort. (フイリトクサ), white-variegated stem

Equisetum hyemale in Hokkaido Univesity Campus

[1] on a grassland completely dominated by E. hyemale at Zenibako Coast (銭函海岸), Otaru City, on August 31 2011. [2] at a backyard of Takahara Restaurant on the foot of Mount Koma on May 2 2017 (also the back of #4). [3] in Keiteki-no-Mori forest (恵迪の森) on July 23 2009. This species has been common in the forest since I was a undergraduate student. [4] at the backyard of Takahara Restaurant on the foot of Mount Koma on August 4 2015. Discarded: in Keiteki-no-Mori forest on April 22 2013