(First upload on April 17 2007. Last on June 5 2024) [ 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
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, self-dispersal
Use: edible (⇔ C. speciosa = poisonous)

medicine: dried rhizomes used as hematic, analgesic and antispasmodic

Chromosome number: 2n = 16, or 24

Corydalis fumariifolia Maxim. ssp. azurea Liden et Zetterlund, recently used

var. angustifolia Yatabe (ホソバエンゴサク), when established

Corydalis ambigua in Hokkaido

[1] on the southern slope of Mount Usu (flora) on April 28 2003. [2] on the roadside of Sarobetsu mire on April 17 2008. The overstory is covered with Polgyonum sachalinense. [3] near the JALTER site in the Uryu Experimental Forest of Hokkaido University, northern Hokkaido, on May 29 2018. [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. Records: at Naka-Toya Camp Site faced to Toya Lake on April 10 2020. Flowering in a forest, of which nickname is Primitive forest (原始林), in the campus of Hokkaido University on May 7 2022.

Natural flower garden

[1] in a forest growing the One-thousand Branched Oak (千本ナラ) in Hamamasu on May 6 2024 on May 6 2021. [2] on a forest floor in front of the Institute of Low Temperature Science, HU, on May 11 2024.

var. angustifolia Yatabe (ホソバエンゴサク)

ST01 ST02 ST03
[1] in a forest (Symbiosis Forest) near Nopporo Forest Park on May 5 2020. [2/3] at a house garden in Shin-Kotoni, Sapporo, on May 1 2021.