Rubia cordifolia var. pratensis / Kurumabaakane クルマバアカネ
cordifolia var. pratensis inhabits sandy soil on the fringe
of lowland forests close to the seashore. It possesses 5-8 whorled
leaves around the main stem. At the species level, leaves are
whorled by four. The petioles, leaf margins, and veins on a leaf
bottom have many prickles. Bloom time: May-July.