(First upload on April 17 2007. Last on June 6 2018) [ 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 (キケマン)
Ezoengosaku (エゾエンゴサク, 蝦夷延胡索), small corydalis
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)

Corydalis ambigua in Hokkaido

[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] near the JALTER site in the Uryu Experimental Forest of Hokkaido University, northern Hokkaido, on May 29 2018.

ST8 ST9 ST10
[5] in the backyard of the Faculty of Agriculture, HU, on April 29 2009. [6] in front of the Institute of Low Temperature Science, HU, on April 21 2012. It was rain. [7] at the Toyotomi Hachiman Shrine, Toyotomi Town, northern Hokkaido, on April 24 2016. [8] at Horomi Pass, Sapporo, in May 1989. [9/10] near Tomamae FuW Spa, central Hokkaido, on April 28 2015.