Species in the genus Euphobia:

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 enter cracks deep. The stems are thick, and alternate leaves are dense, 4-7cm long, long-oblong or oblanceolate. 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.