Description from Flora of China
Mitrasacme alsinoides R. Brown var. indica (Wight) H. Hara.
Annuals, erect, to 15 cm tall. Stems usually branched, slender, distinctly 4-ribbed to narrowly 4-winged, glabrous or subglabrous; internodes 2--4 X as long as leaves. Leave blade ovate to very narrowly ovate, 3--7 X 1.5--2.5 mm, herbaceous, glabrous or glabrescent, apex acute, midvein abaxially prominent, lateral veins inconspicuous on both surfaces. Flowers solitary in upper leaf axils. Pedicel filamentous, 3--8 mm, glabrous or scabrous. Calyx to 2 mm, glabrous, basally connate to ± half its length, lobes narrowly oblong. Corolla white, campanulate, 3--4 mm, shortly and sparsely bearded at mouth; lobes subrounded, ca. 1.5 mm. Stamens included; filaments ca. 1 mm; anthers introrse, ovate to rarely sagittate, ca. 0.7 mm, with an apical appendix. Pistil ca. 1.5 mm. Ovary ovoid, ca. 0.5 mm in diam. Style ca. 1 mm, base strongly parted, connate along apical half; stigma broadly truncate to 2-cleft. Fruiting pedicel 0.6--2.5 cm. Capsules subglobose, to 2 mm in diam.; style connate only at apex. Seeds angular-ovoid, coarsely reticulate. Fl. Feb-Jun.
Grassy open places; 0--500 m. Fujian, Guangdong, Hainan, Jiangsu, Shandong, Taiwan [India, Indonesia, Japan, Korea, Malaysia, Myanmar, Philippines, Sri Lanka, Thailand, Vietnam; Australia].