Viola riviniana

Rhizomatous perennial herb; stems decumbent to ascending. Leaves alternate, sometimes closely so, but not strictly tufted; lamina ovate-circular, 10–45 mm long, 10–35 mm wide, sparsely covered in hairs, base cordate, apex obtuse to shortly acuminate, margins broadly toothed to creanate; petiole 1–8 cm long; stipules adhering to petiole at base, lanceolate, c. 1 cm long, fimbriate. Flower-scapes 2.5–6 cm long, glabrous; bracteoles above middle. Sepals lanceolate, 7–12 mm long, acute, basal appendages prominent, enlarging in fruit; petals 10–14 mm long, blue-violet, lower petal obovate, with spur c. 5 mm long, sometimes shallowly notched at apex. Capsule ovoid, 7–10 mm long. Seeds ovoid, c. 2 mm long, yellowish-brown. Flowers c. Dec.