Japanese name: コイヌガラシ（小犬芥子） Scientific name:Rorippa cantoniensis
[Overview]
An annual or biennial 10–40 cm tall, growing in wet places such as paddy fields and floodplains.
The whole plant is hairless.
The stem is erect and often branches from the base.
Leaves are alternate, 2–5.5 cm long and 0.5–2.5 cm wide, pinnately divided into 2–6 pairs of lobes.
The leaf margins are toothed.
Leaves on the lower part of the stem have petioles, while those on the upper part have none and the leaf base projects like an ear.
It usually flowers in spring, but often flowers in autumn as well.
A single yellow 4-petaled flower about 0.2 cm across is borne in the axil of a leaf-like bract or a leaf.
The flowers have short stalks.
The fruit is a cylindrical to linear silique 0.5–1 cm long, held erect.
The seeds are ovate.
