Japanese name: イヌカキネガラシ（犬垣根芥子） Scientific name:Sisymbrium orientale
[Overview]
An annual or biennial 20–70 cm tall, found by roadsides and on vacant lots.
White hairs grow sparsely over the whole plant.
The stem branches in the upper part.
There are basal leaves and stem leaves, oblong, 3–8 cm long and 2–4 cm wide, deeply pinnately divided.
The terminal lobe is more than half the length of the leaf, and there are few lateral lobes.
The lobes are pointed at the tip.
The leaves on the stem are alternate, and some upper leaves are not divided but hastate.
Racemes at the stem tips sparsely bear pale yellow four-petaled flowers about 1 cm across.
The inflorescence lengthens after flowering.
The fruit is a slender cylindrical silique 6–10 cm long and about 2 mm wide, growing diagonally upward.
The fruit has a stalk 0.3–0.6 mm long.
The seeds are angular oblong and lie in a single row.
[History]
It was first collected in 1912 in Matsushima, Miyagi, and is naturalized from Honshu southward.
