Notes For Reference:-

Species, Varieties, or Forms in the Genus Euphorbia:

Euphorbia jolkinii / Iwataigeki
Euphorbia maculata / Oonishikisou
Euphorbia pekinensis / Takatoudai
Euphorbia sieboldiana / Natsutoudai
Euphorbia supina / Konishikisou

　

Euphorbia jolkinii / Iwataigeki イワタイゲキ

Euphorbia jolkinii is a perennial herb 30-50cm in height that inhabits rocky areas on seashores. It forms colonial clusters with well-developed rhizomes that penetrate deep into cracks. The stems are thick, and the alternate leaves are dense, 4-7cm long, with long-oblong or oblanceolate shapes. The stems set some leaves in a whorl on their ends, radiate branches in all directions from leaf axils, and bear ochathiums (cup-shaped inflorescences) with yellow flowers. Bloom time: April-June.