Description from Flora of China
Convolvulus nummularius Linnaeus, Sp. Pl. 1: 157. 1753; Evolvulus yunnanensis S. H. Huang.
Herbs perennial. Stems several, rooting at nodes, prostrate, 20-40 cm, slender, ± villous or scabrous. Leaves distichous; petiole 2-4 mm; leaf blade nearly circular, 1.3-1.7 X 1.2-1.4 cm, glabrous or appressed pilose abaxially, base cordate to rounded, apex rounded or emarginate; lateral veins 2 or 3 pairs. Peduncle absent or very short. Pedicel 2.5-3 mm, densely villous. Flowers 1 or 2 per leaf axil. Sepals persistent, oblong-ovate to oblong, 3-4 2-3 mm, outer 2 slightly longer than inner ones, pilose abaxially, margin ciliate. Corolla broadly campanulate or subrotate, ca. 6 mm; limb ca. 7-8 mm in diam., 5-lobed. Stamens inserted at middle of corolla tube; filaments ca. 1.5 mm, glabrous basally; anthers oblong. Ovary globose. Style lobes linear, ca. 3 mm; stigmas minutely capitate. Capsule ovoid, 2-3 mm in diam. Seeds 2-4, brown, ovoid-trigonous, ca. 1 0.5 mm, minutely tuberculate.
2n = 24.
This is the first record of this species from China. Evolvulus yunnanensis S. H. Huang is here reduced to synonymy for the first time.
Roadsides; ca. 1000 m. Yunnan (Luxi Xian) [naturalized in India and Malaysia; Africa, native in North and South America]