黄白杜根藤 huang bai du gen teng

Calophanoides xantholeuca (W. W. Smith) C. Y. Wu ex C. C. Hu.

Shrubs to 30 cm tall. Stems 4-angled, much branched, sulcate, pilose then glabrescent. Petiole 2-5 mm, pilose; leaf blade lanceolate, 2-3 × 0.7-1 cm, papery, both surfaces pilose along veins, secondary veins ca. 3 on each side of midvein, base cuneate, margin entire, apex acute. Spikes axillary, 3-5-flowered; bracts lanceolate or ovate, 5-6 mm; bracteoles subulate, narrowly lanceolate, or ovate, smaller than bracts. Calyx grayish white, ca. 5 mm, white pilose along midvein, 5-lobed almost to base; lobes linear-lanceolate. Corolla white, ca. 8 mm, outside sparsely pilose; lower lip 3-lobed; upper lip emarginate. Staminal filaments ca. 5 mm, sparsely hirsute; anther thecae superposed, lower one spurred at base. Ovary glabrous; style ca. 6 mm, subglabrous. Capsule ca. 5 mm, glabrous. Seeds ovate in outline, ca. 1 × 1 mm, tuberculate-verrucose. Fl. Nov-Jan.

● Thickets on dry slopes; 400-800 m. Yunnan.