(First upload on April 17 2007. Last on May 10 2015) [ 日本語 | English ]

Corydalis ambigua Cham. et Schltdl

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

Corydalis A. P. de Candolle (キケマン) in Japan

C. ambigua Cham. et Schltdl. (エゾエンゴサク)
C. capillipes Franch. (ミチノクエンゴサク)
C. curvicalcarata Miyabe et Kudo (エゾオオケマン)
C. decumbens (Thunb.) Pers. (ジロボウエンゴサク), temperate regions (China - Taiwan - Shikoku)

f. albescens (Takeda) Ohwi (シロバナジロボウエンゴサク)

C. heterocarpa Sieb. et Zucc. (キケマン, s.l.)
C. incisa (Thunb.) Pers. (ムラサキケマン)
C. kushiroensis Fukuhara (チドリケマン)
C. lineariloba Sieb. et Zucc. (ヤマエンゴサク), temperate regions (not in Hokkaido)

var. capillaris Ohwi (ヒメエンゴサク)
var. papilligera Ohwi (キンキエンゴサク)

C. ochotensis Turcz. (ツルキケマン)

var. raddeana (Regel) Nakai (ナガミノツルケマン)

C. ophiocarpa Hook. et Thom. (ヤマキケマン)
C. pallida (Thunb.) Pers. (フウロケマン)

var. tenuis Yatabe (ミヤマキケマン)

C. racemosa (Thunb.) Pers. (ホザキキケマン)
C. speciosa Maxim. (エゾキケマン)
C. tashiroi Makino (シマキケマン)

Corydalis ambigua in Hokkaido

Ezoengosaku (エゾエンゴサク, 蝦夷延胡索)
Lifeform: tuberous, perennial forb growing up to 20 cm
Distribution: Sakhalin, southern Kuril, Okhotsk coast, Japan (Hokkaido, and northern Honshu) (exact range not determined due to the taxonomic confusion)
Habitat: spring ephemeral in woodland, shady forest edge

Flora on Mount Usu

Body: hairless
Leaf: scale-like leaf at the bottom, two leaves on the flowering stems
Bulb: globular, 1-2 cm in diameter → one flowering stalk from a bulb
Seed: black, smooth and shiny
Edible plant (C. speciosa is poisonous)
Chromosome number: 2n = 16, or 24

Corydalis fumariifolia Maxim. ssp. azurea Liden et Zetterlund
Corydalis ambigua Cham. et Schltdl. var. angustifolia Yatabe

var. angustifolia Yatabe (ホソバエンゴサク)

[1] on the southern slope of Mount Usu on April 28 2003. [2/3] on the roadside of Sarobetsu mire on April 17 2008. The overstory is covered with Polgyonum sachalinense.

[4] in the backyard of the Faculty of Agriculture, HU, on April 29 2009. [5] in front of the Institute of Low Temperature Science, HU, on April 21 2012. It was rain. [6] at the Toyotomi Hachiman Shrine, Toyotomi Town, northern Hokkaido, on April 24 2016. [7] at Horomi Pass, Sapporo, in May 1989. [8/9] near Tomamae FuW Spa, central Hokkaido, on April 28 2015.