Galium japonicum ("Kurumamugura")

Japanese name: クルマムグラ （車葎）
Scientific name: Galium japonicum

A perennial 20–50 cm tall, growing in forests in deep mountains.
The rhizome creeps somewhat horizontally, and the erect stem has 4 ridges.
The ridges have no prickles.
The leaves are 1–3 cm long and 0.3–1 cm wide, usually in whorls of 6, and entire.
1–3 cymes at the stem tip bear a few to several dozen flowers sparsely.
The flowers are 2.5 mm across and white, with a 4-lobed corolla.
The fruit is 2–2.5 mm across and densely covered with long hooked hairs.

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