Description from Flora of China
Shrubs or small trees, evergreen, 2–6(–9) m tall, much branched. Twigs inconspicuously angled, pubescent or glabrous; bud scales inconspicuous. Leaves scattered; petiole 2–8 mm, puberulous or glabrous; leaf blade elliptic, rhombic- or lanceolate-elliptic, or lanceolate, rarely obovate, (1.1–)4–9 × (0.7–)2–4 cm, thinly leathery, glabrous, secondary veins 5–7 pairs, barely raised, fine veins conspicuous or not, base cuneate, broadly cuneate, or obtuse, margin plane, denticulate, apex acute, acuminate, rarely rounded or long acuminate. Inflorescences pseudoterminal, racemose, 4–10 cm, densely pubescent, rarely glabrous, many flowered; bracts persistent or caducous, leaflike, lanceolate, 0.5–2 cm. Pedicel ca. 4 mm, densely pubescent or subglabrous. Hypanthium densely pubescent or tomentellate, rarely subglabrous; calyx limb ca. 1 mm, triangular-toothed. Corolla white, rarely reddish, tubular or slightly urceolate, 5–7 mm, densely pubescent; lobes reflexed, triangular. Filaments 2–2.5 mm, densely pilose; anthers 2–2.5 mm, without spurs; tubules 2–2.5 × as long as thecae. Berry 10-pseudoloculed, dark purple, pubescent. Fl. Jun–Jul, fr. Aug–Oct.
This species is used medicinally and to stain cooked rice.
Forests, thickets, grassy places at roadsides; 400–1500(–1900) m. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hunan, Jiangsu, Jiangxi, Sichuan, Taiwan, Yunnan, Zhejiang [Cambodia, Indonesia, S Japan, Korea, Laos, Malaysia, Thailand, Vietnam].