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(First upload on November 20 2017. Last on August 25 2018) [ 日本語 | English ]

Athyrium Roth (メシダ) A. distentifolium Tausch ex Opiz = A. alpestre (Hoppe) Clairv., the standard Okuyamawarabi (オクヤマワラビ, 奥山蕨), alpine lady-fern Lifeform: summergreen fern with short rhizomes and 30-60 cm in height Distribution: boradly in the Northern Hemisphere, including Japan (north to central Honshu) Habitat: meadows and rocky hillsides in subalpine and alpine zones in the case of Japan

var. distentifolium, the type in Europe var. americanum (Butters) B. Boivin, (American) alpine lady-fern Amerika-okuyamawarabi (アメリカオクヤマワラビ*), (*: tentative) Chromosome number: n = 40 Synonyms: Athyrium americanum (Butters) Maxon, adopted by USDA (Dryopteridaceae)

Athyrium distentifolium in the West Coast

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Athyrium alpestre

1 2
[1/2] in the backyard of Mount Fuji Research Institute, Yamanashi Prefectural Government, on December 9 2017.

var. americanum

1 2 3
[1-3] in Ira Keller Fountain, Portland, Oregon, on August 8 2017.