Description from Flora of China
Loxostigma sesamoides Handel-Mazzetti, Oesterr. Bot. Z. 85: 217. 1936; Staurogyne dolichocalyx E. Hossain.
Herbs to 40 cm tall, unbranched. Stems striate, tomentose, soon glabrescent. Petiole 1.5-4 cm, tomentose; leaf blade elliptic-lanceolate, 5-13 × 2-5.5 cm, abaxially pubescent along veins, adaxially glabrous, secondary veins 5-11 on each side of midvein, base cuneate, margin entire or sometimes irregularly undulate, apex acuminate to sometimes acute. Racemes terminal or axillary, densely flowered, elongated after flowering; peduncle and rachis pubescent; bracts lanceolate, 6-7 × 2-2.2 mm, pilose, 3-veined; bracteoles lanceolate, 8-8.5 × ca. 2 mm, pilose. Pedicel 0.8-1 mm but elongated to 5 mm in fruit, tomentose. Calyx 1.8-2.4 mm, outside sparsely pilose or glabrous; lobes lanceolate, 1.6-2.2 × 0.1-0.2 cm, subequal. Corolla white or pinkish on lobes, 3-4 cm; lobes suborbicular, ca. 1 cm in diam., subequal, 3-veined. Stamens with longer pair ca. 1.7 cm and shorter pair ca. 1.3 cm; filaments gland-tipped hairy and apically more densely hairy; anther thecae ca. 2.5 × 1.5 mm, with appendage, margin hispid. Ovary glabrous; ovules ca. 60 in 2 rows; style ca. 2 cm, sparsely pubescent; stigma triangular, 2-cleft; stigma lobes fimbriate on margin, posterior one elliptic and ca. 3 × 2 mm, anterior one ca. 4 × 4 mm. Capsule narrowly ellipsoid. Seeds small, alveolate. Fl. Mar-May.
Moist places in forests; below 800 m. Guangdong, Guangxi [Vietnam].