Japanese name: チョウジタデ（丁字蓼） Scientific name:Ludwigia epilobioides subsp. epilobioides
[Overview]
An annual 15–100 cm tall, found in wetlands, rice paddies and similar places.
The stems are tinged with reddish purple.
The stem is erect, ridged, and branches well.
Leaves are simple and alternate, lanceolate to oblong-lanceolate, 1–10 cm long and 0.4–2.5 cm wide, with entire margins.
There are short leaf stalks.
Flowers are small, yellow and 4-petaled, borne singly in the leaf axils.
The sepals are ovate-lanceolate and longer than the petals.
The fruit is a capsule about 1.5–3 cm long, cylindrical with 4 ridges, tinged with purple, with the 4 sepals remaining at the top.
