Description from Flora of China
Oldenlandia platystipula (Merrill) Chun.
Herbs or subshrubs, erect to perhaps weak, to 40 cm tall; stems flattened to 4-angled, sometimes sulcate, glabrous. Leaves petiolate; petiole 3-18 mm, glabrous; blade drying membranous, elliptic, oblong-ovate, or oblong-lanceolate, 5-12 × 2.5-4 cm, adaxially glabrous or rarely puberulent along principal veins, abaxially glabrous or papillose on principal veins, base cuneate to rounded and usually shortly decurrent, apex acute to shortly acuminate; secondary veins 4-6 pairs; stipules interpetiolar, reniform, ovate, or suborbicular, 5-10 mm, glabrous, broadly rounded to broadly triangular, fringed-lacerate or with numerous lobes or bristles 0.3-2 mm, usually glandular at apex. Inflorescence axillary, glomerate, subglobose, 1-2.5 cm in diam., glabrous, sessile; bracts not seen. Flowers sessile to subsessile, biology unknown. Calyx glabrous; hypanthium portion turbinate to ellipsoid, 1.2-2 mm; limb lobed essentially to base; lobes narrowly lanceolate to triangular, 4-6 mm, ciliate. Corolla white, tubular, outside glabrous; tube 6-7 mm, inside apparently glabrous; lobes lanceolate to triangular, 1.5-2 mm. Anthers ca. 2 mm, partially exserted. Stigmas ca. 1.5 mm, included. Capsules oblong-ellipsoid to obconic, 2-3 × 1.5-2 mm, somewhat flattened laterally, septicidally then loculicidally dehiscent; seeds ca. 10, black, scabrous. Fl. May-Aug, fr. Sep.
● Forests in valleys, on rocks at streamsides. Guangdong, Guangxi.