Japanese name: ハタザオガラシ（旗竿芥子） Scientific name:Sisymbrium altissimum
[Overview]
An annual or biennial 20–120 cm tall, found on roadsides and in vacant lots.
The stem branches in the upper part, and long hairs may grow on the lower part.
There are basal leaves and stem leaves; they are oblong and deeply pinnately divided, with 2–12 pairs of lateral lobes.
On the lower part of the stem the lobes are oblong with toothed margins; toward the top the number of lobes decreases, and they finally become thread-like.
A raceme at the stem tip sparsely bears pale yellow 4-petaled flowers about 0.8 cm across.
The fruit is a rod-shaped silique 4–10 cm long and about 1.2 mm wide, extending obliquely upward.
The fruits have stalks 0.6–1 cm long.
The seeds are obovate and arranged in one row.
[History]
It was first collected in 1909 in Shibuya, Tokyo.
