Notes For Reference:-

Species, Varieties, or Forms in the Genus Opithandra:

Opithandra primuloide / Iwagirisou

Opithandra primuloide / Iwagirisou イワギリソウ

Opithandra primuloide is a perennial herb borne on wharves in valleys; leaves are thick, emerging from the bases with 4-10cm-long petioles in the shape of a broad ovate, 4-10cm in length, and the margins are serrated. Flower stalks arise from leaf axils, bear umbels on them, and set approximately ten red-purple flowers blooming sideways. The corollas are funnel-shaped, labiate, and about 2cm in length. If this species once dries up and withers, it turns into something like a piece of dried, gray paper sticking to the rocks. It can appear to be part of the cliff, and observers may not notice. However, it revives with abundant rainfall. Bloom time: May-June.