Japanese name: カキネガラシ（垣根芥子） Scientific name:Sisymbrium officinale
[Overview]
An annual or biennial 15–80 cm tall, found by roadsides and on vacant lots.
The stems branch and are densely covered with coarse and fine hairs.
There are basal leaves and stem leaves, deeply pinnately divided, with several pairs of lateral lobes that become smaller toward the upper part of the stem, and the terminal lobe also becomes 1–2 pairs.
Racemes at the stem tips bear yellow four-petaled flowers about 0.4 cm across.
The calyx is hairy.
The inflorescence lengthens after flowering.
The fruit is a rod-shaped silique 1–1.5 cm long and about 1 mm wide, pressed closely against the stem, and either densely covered with short hairs or hairless.
The seeds are distorted rhombic and lie in a single row.
[History]
It was named in 1902 by Tomitaro Makino based on a specimen collected in Yokohama Village, Aomori (now Yokohama Town).
