Veratrum patulum Loesener.

Plants to 1 m tall, basally with dense, non-reticulate fibers formed from disintegrated sheaths. Leaves cauline, sessile, basally clasping; leaf blade elliptic or oblong, (3--)14--22(--29) × ca. 14 cm, abaxially glabrous or sparsely pubescent, apex acute or acuminate. Panicle 30--35(--50) cm, many flowered; lateral branches and terminal raceme 8--12 cm; rachis densely pubescent-woolly. Pedicel 1--3(--6) mm, shorter than bracts. Tepals adaxially white, abaxially green, oblong to obovate-oblong, 7--11 × 3--6 mm, base narrowed, margin denticulate, apex rounded or subacute; outer tepals slightly pubescent at abaxial base. Stamens 4--7 mm. Ovary ca. 2 × 1 mm, sparsely pubescent or papillose-pubescent. Fl. Jul. 2 n = 32, 64, 70(--72), 80.

Forested slopes, moist meadows; near sea level to 2200 m. Heilongjiang, Jilin, Liaoning [Japan, Korea, Russia].