黄海棠(原亚种) huang hai tang (yuan ya zhong)

Ascyrum sibiricum Lamarck ex Poiret; Hypericum ascyron var. giraldii R. Keller; H. ascyron var. hupehense Pampanini; H. ascyron var. longistylum Maximowicz; H. ascyron var. micropetalum R. Keller; H. ascyron var. umbellatum R. Keller; H. biondii R. Keller p.p.; H. hemsleyanum H. Léveillé & Vaniot; H. longifolium H. Léveillé; H. scallanii R. Keller; Roscyna gmelinii Spach; R. japonica Blume.

Plants 0.5-1.3 m tall. Leaves 4-12 × (0.5-)0.7-4 cm, base usually cordate-amplexicaul. Flowers 4.5-8 cm in diam. Sepals ovate or oblong to elliptic or lanceolate or obovate, 6-10 mm wide, apex rounded to obtuse or rarely apiculate to acute. Styles 4-15 mm, 0.7-2 × as long as ovary, nearly free to 0.8 united. Capsule ovoid to ovoid-pyramidal or ovoid-cylindric.

Throughout China except Xinjiang, Xizang, and parts of the northeast [Japan, Korea, Mongolia, Russia (Altay Mountains eastward except Sakhalin, Kamchatka, and Kurile Islands), ?Vietnam].