Japanese name: コタネツケバナ（小種漬花、小種浸花） Scientific name:Cardamine debilis
[Overview]
A winter annual found in wet places such as paddy fields.
The stem is about 5–20 cm tall and branches from the lower part; it is usually hairless, sometimes with a few hairs only at the base.
There are basal leaves and leaves alternate on the stem; they are pinnately compound and hairless.
There are 2–5 pairs of lateral lobes; each lobe is broadly ovate to round, and the terminal lobe is slightly larger than the lateral lobes.
The flowers are borne in racemes and are small, white and 4-petaled.
There are 6 stamens.
In places that are flooded, such as the floodplains of rivers, it bears cleistogamous flowers (petal-less flowers) whose petals have degenerated, and these flowers have 4 stamens.
The fruit is a silique 1–2 cm long with a short fruit stalk.
Inside the fruit, many seeds about 1 mm long are arranged in one row, and the edge of the seed has a narrow membranous wing.
[Notes]
The form bearing cleistogamous flowers was discovered at the Kokai River in Ibaraki and is sometimes distinguished as a separate species under the name Kokai-tanetsukebana.
