Galium verum subsp. asiaticum var. asiaticum f. luteolum ("Kibanakawaramatsuba")

Japanese name: キバナカワラマツバ （黄花河原松葉）
Scientific name: Galium verum subsp. asiaticum var. asiaticum f. luteolum

[Overview]
A perennial 30–80 cm tall, found on sunny, dry riverbeds and grasslands.
The stems and leaves have soft hairs.
The stem is hard, erect, and round in cross section.
The leaves are linear, 2–3 cm long and 0.1–0.3 cm wide, and grow in whorls of 8–10.
The leaf margins curl slightly toward the underside, and the tip has a short spine.
Paniculate cymes at the leaf axils and stem tips bear many flowers.
The flowers are 0.2 cm across and pale yellow, with a 4-lobed corolla.
The fruit is 0.1 cm across and hairless.

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