Vincetoxicum kenouriense - Himalayan Swallow-Wort

Himalayan Swallow-Wort is an undershrub, up to 1 m tall. Leaves opposite; leaf-stalks 1-10 mm long, blade strongly discolorous, narrow to broadly ovate, 4-10 x 1.8-6.5 cm; tip narrowly pointed to very shortly tapering; base round to nearly heart-shaped to nearly flat; venation including tertiary and quaternary veins prominent. Inflorescences are mostly stalkless, or flower-cluster-stalks up to 1.5 cm. Flower-stalks are 2-8 mm long, flowers yellowish-green to green, 4-5 x 2-2.5 mm; sepals tapering to pointed or narrowly pointed tips, up to 2 mm long, margins sparsely fringed with hairs. Flower-tube is about 1 mm long, petals oblong with blunt tips, 3-3.5 x 1-2 mm; corona lobes long-triangular, slightly divergent, about 1 x 0.8 mm. Seed-pods are spindle-shaped, up to 7 x 1 cm, tip long-tapering, surface hairless, slightly striped. Himalayan Swallow-Wort is found in the Himalayas, from Hindukush to Bhutan in the East, at altitudes of 1500-3000 m. Flowering: May-August.