Description from Flora of China
Herbs perennial. Stems several to numerous, prostrate or ascending, slender, with appressed and spreading hairs. Leaves petiolate or subsessile, 0.7-2.5 cm X 5-10 mm. Cymes 1- to few flowered; peduncles filiform, 2.5-3.5 cm; bracts linear-subulate to linear-lanceolate, 1.5-4 mm. Sepals lanceolate, 3-4 mm, villous. Corolla rotate, 7-10 mm in diam. Stamens included; filaments filiform, adnate to base of corolla tube. Ovary glabrous. Styles 2, free. Capsule globose, 4-valved. Seeds 4 or fewer, black, smooth. Fl. and fr. year round. 2n = 26.
Sandy soil, dry slopes, cultivated areas, maritime areas, grasslands, thickets, roadsides; 0-1800 m. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hubei, Hunan, Jiangsu, Jiangxi, Qinghai, Sichuan, Taiwan, Xizang, Yunnan, Zhejiang [Bangladesh, Cambodia, India, Indonesia, Japan (Ryukyu Islands), Laos, Malaysia, Myanmar, Nepal, Pakistan, Philippines, Thailand, Vietnam; Africa, Australia, North America, Pacific Islands, South America]