Description from Flora of China
Gratiola viscosa Hornemann, Enum. Pl. Hort. Hafn. 19. 1807; Hornemannia viscosa (Hornemann) Willdenow; Lindernia cruciformis Hayata; Vandellia viscosa (Hornemann) Merrill.
Annuals, without long stolons. Stems erect or sparsely diffuse, striate, with coarse spreading long hairs. Leaves short petiolate below, sessile above; leaf blade ovate-oblong, to 5 cm, sparsely coarsely hairy, base decurrent, margin undulate and toothed, apex obtuse to rounded. Upper leaves sessile, wider than long, smaller than basal leaves, base semiamplexicaul and sometimes broadly cordate. Raceme lax, 6-10-flowered; peduncle ascending to spreading at anthesis, recurved after flowering, to 1 cm in fruit, coarsely hairy; bracts small, lanceolate. Pedicel ascending to spreading at anthesis, recurved and to 1 cm in fruit, coarsely hairy. Calyx ca. 3 mm, lobed to base; lobes narrowly lanceolate, outside coarsely hairy. Corolla white or yellowish, to 5-6 mm; lower lip ca. 3 mm, lobes subequal; upper lip ca. 2 mm, 2-lobed. Stamens 4, all fertile. Capsule globose, almost as long as persistent calyx. Seeds ellipsoid-oblong. Fl. May-Aug, fr. Sep-Nov.
Forests, next to rocks; 900-1300 m. Guangdong, Guangxi, Jiangxi, Taiwan, S Yunnan [Cambodia, India (Darjeeling), Indonesia, Laos, Myanmar, New Guinea, Philippines, Sikkim, Thailand, Vietnam].