三角叶酢浆草 san jiao ye cu jiang cao

Acetosella obtriangulata (Maximowicz) Kuntze.

Perennials 5-12 cm tall, to 28 cm tall in fruit, stemless, sparsely pubescent. Rhizome creeping underground, 5-8 mm in diam., covered densely by glabrous fleshy brown scalelike remains of leaf bases. Leaves basal; petiole 4-9 cm, to 25 cm in fruit, rubiginously pubescent; leaflet blades broadly obtriangular, 1-1.8 × 1.4-2.2 cm, to 4.5 × 6 cm in fruit, abaxially pubescent or glabrous, adaxially glabrous, apex truncate to subtruncate; lobe apices subacute. Flowers solitary, nodding; bracts 3-4 mm, almost at base of flowers (1-2.5 cm from fruit due to pedicel extension). Sepals oblong, 7-8 mm, persistent. Petals white, oblong-obovate, ca. 1.6 × 0.8 cm, apex emarginate. Capsule long conical, 3-4 × 0.6-0.8 cm. Seeds ovoid, 1.8-2 × 1-1.5 mm, longitudinally ridged. Fl. and fr. May-Jun.

Forests, thickets, shady places; 700-1500 m. Jilin, Liaoning [N Japan, Korea, Russia].

Specimens of Oxalis griffithii are often misidentified as this species. Reports of O. obtriangulata from Anhui (S. H. Huang et al., Anhui Zhiwuzhi (Fl. Anhui) 3: 218. 1990) and Henan (B. Z. Ding & S. Y. Wang, eds., Henan Zhiwuzhi (Fl. Henan) 2: 404. 1988) are almost certainly O. griffithii.