Description from Flora of China
Lobelia affinis Wallich ex G. Don (1834), not Mirbel (1805); L. affinis var. lobbiana (J. D. Hooker & Thomson) C. B. Clarke; L. barbata Warburg (1891), not Cavanilles (1800); L. hirta Linnaeus; L. lobbiana J. D. Hooker & Thomson; L. subcuneata Miquel; L. succulenta Blume; L. succulenta var. lobbiana (J. D. Hooker & Thomson) F. E. Wimmer; L. zeylanica var. hirta (Linnaeus) Martyn; L. zeylanica var. lobbiana (J. D. Hooker & Thomson) Y. S. Lian.
Herbs, succulent. Stems prostrate, 4-angular, 20-60 cm, glabrous or puberulent, laxly branched, lower nodes rooted. Leaves spirally alternate; petiole 3-12 mm, puberulent; blade broadly deltoid-ovate or ovate, 1-5.4 × 0.8-3 cm, abaxially sparsely scaberulose along veins, adaxially glabrescent, base truncate, shallowly cordate, or broadly cuneate, margin serrulate, apex acute or obtuse. Flowers solitary and axillary; pedicels 0.5-2.8 cm, sparsely puberulent, bracteoles 2 at base, 1-2 mm, sometimes caducous. Calyx campanulate, 2-5 mm, puberulent; lobes linear, narrowly triangular, or narrowly oblong, 3-7 × 0.5-1 mm, ciliate. Corolla 2-lipped, purple, pale purple, or white, 5-15 mm, posterior side divided to base, lobes of upper lip obovate-oblong, those of lower lip broadly elliptic, abaxially sparsely villous along middle ribs. Filaments connate into a tube at 2/3; anther tube 1-1.8 mm, abaxially puberulent, anthers all barbate at top. Ovary inferior. Capsule broadly ellipsoid, obovoid, or oblong, 4-7 × 2-4 mm, obviously veined. Seeds 3-angular, red-brown. Fl. and fr. whole year round.
By water and streams in ravines; below 1500(-2000) m. Fujian, Guangdong, Guangxi, Hainan, Taiwan, Yunnan [Bangladesh, Bhutan, India, Indonesia, Laos, Malaysia, Myanmar, Nepal, New Guinea, Philippines, Sri Lanka, Thailand, Vietnam].