Lysimachia davurica Ledeb. (Primulaceae) is a folk medicinal plant, growing in the Northeastern China, Japan, Korea, Mongolia, Russia. The whole plant is used for treating hypertension. Two new saponins named davuricoside I (1) and davuricoside E (2) were isolated from the whole plants of Lysimachia davurica.
Lysimachia davurica Ledeb. Herbs perennial, 40--80 cm tall, with creeping rhizomes. Stems erect, stout, simple or weakly branched, glabrous basally, viscid-pubescent apically. Leaves opposite or in whorls of 3 or 4, very short petiolate or sessile, elliptic-lanceolate to linear-lanceolate, 4--12 * 0.5--4 cm; Panicles terminal and axillary; bracts linear, densely glandular puberulous. Pedicel 7--12 mm. Calyx lobes triangular, ca. 3.5 mm, margin black glandular striate. Corolla bright yellow, ca. 8 mm, deeply parted; lobes oblong, adaxially densely glandular, apex rounded. Filaments connate basally into a ca. 1.5 mm high ring, free parts 2--3 mm, densely glandular.