(First upload on August 23 2013. Last on September 1 2018) [ 日本語 | English ]

Oxalis acetosella L.

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

Oxalis L. (カタバミ)
Komiyamakatabami (コミヤマカタバミ, 小深山片喰), common wood sorrel
Lifeform: perennial forb < 20 cm high
Distribution: Europe and parts of Asia, including northern Japan
Habitat: forest floor, in particula, on shady needle-leaved forests in subalpine zones
Leaf: radical with 3-10 mm long stalk, sour → oxalic acid
Leaflet: rounded, 7-12 mm wide
Calyx: 4-5 mm long
Flower: white - pink (May - June), the stalk 4-10 cm long
Rhizome: a few scales on the top, thin and stoloniferous with sparse nodes Seed dispersal: self

Cf. O. griffithii Edgew. et Hook. f. (ミヤマカタバミ): distributed in Japan except Hokkaido

ssp. taemonii (Yamam.) S. F. Huang et T. C. Huang (センザンカタバミ)
var. acetosella f. vegeta (Tatew.) M. Mizush. (エゾミヤマカタバミ)
var. longicapsula Terao (ヒョウノセンカタバミ): south to Hiyama District, Hokkaido, large shoot and oblong fruit, leaflet = 2.5-5.0 cm long

Oxalis acetosella in Asia

[1] on a trail to Matsuyama Bog, northern Hokkaido, on June 27 2018. [2/3] at a trail to go Mount Higashi-Nupukaushinupuri (1252 m elevation), eastern Hokkaido, on June 27 2013. [4] on the foot of Mount Onnebetsu, northeastern Hokkaido on June 27 1996. [5/6] in the Dell Forest, Changbai Mountain, Jilin Province, China, on June 12 2017. Observed on Mount Eniwa.