Japanese name: マツバゼリ（松葉芹） Scientific name:Cyclospermum leptophyllum
[Overview]
An annual 15–70 cm tall, found in fields, along roadsides and similar places.
The whole plant is hairless.
It has a smell like celery.
The leaves are alternate and finely divided 2–4 times pinnately, with linear to thread-like lobes.
The base of the petiole clasps the stem like a sheath.
Opposite the leaves, a compound umbel made up of 2–4 umbels is produced, bearing small white 5-petaled flowers.
The fruit is a schizocarp about 1.5 mm across, with 5 raised ribs.
[History]
It was discovered in 1893 by Ikeno Seiichiro at Mogi in Hizen (now Nagasaki), and was named by Makino Tomitaro.
Naturalization has been confirmed in the Kanto region and westward.
