(First upload on September 11 2013. Last on July 8 2018) [ 日本語 | English ]

Rorippa indica (L.) Hiern

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

Rorippa L. (イヌガラシ)
Inugarashi (イヌガラシ, 犬芥子), variableleaf yellowcress
Lifeform: weedy perennial forb < 60 cm high
Distribution: east Asia, including the whole of Japan
Habitat: urbanized areas, crop fields, riversids, grasslands, etc. (wet sites)

Field training on integrated environmental research (統合環境調査法実習) (fauna and flora 種リスト)
HUSTEP: Plants and Plant communities in Japan (flora list)

Flower: no hair, φ = 4-5 mm
Style: short and thick
Fruit: 11-21 mm long
Leaf: few teeth

R. islandica fl = 3 mm, fr = 6 mm, st = slim, lf = many teeth

Chromosome number: 2n = 24, 32, or 48

Rorippa atrovirens (Hornem.) Ohwi et H. Hara

var. apetala Hochr. (アオイヌガラシ): no petals
f. longicarpa (Koidz.) Kitam. (ナガミノイヌガラシ): long capsules

Rorippa indica in Hokkaido

Rorippa1 Rorippa2 Rorippa3
Rorippa4 Rorippa5 Rorippa6
[1] in a waste land near Muroran Marine Station, Muroran City, on September 12 2016. [2] along a road, N15/W4, North Ward, Sapporo, on June 17 2013. [3] in a small park, N26/W4, North Ward, Sapporo, on May 23 2018. [4/5] at a roadside, N21/W4, North Ward, Sapporo, on May 24 2014. [6] in front of the Faculty of Agriculture, Hokkaido University, on June 17 2014.