1. Staurogyne hypoleuca Benoist, Notul. Syst. (Paris). 2: 338. 1911.
灰背叉柱花 hui bei cha zhu hua
Ophiorrhiziphyllon hypoleucum (Benoist) Benoist.
Herbs to 1 m tall. Stems glabrous, lenticellate. Petiole 3-6 cm; leaf blade oblong, elliptic, or lanceolate, 13-17 × 4.5-7 cm, both surfaces glabrous, abaxially glaucous, adaxially green, secondary veins 8-11 on each side of midvein, base cuneate and slightly decurrent onto petiole, margin entire or undulate, apex acuminate to sometimes acute. Racemes terminal or in axils of apical leaves, to 15 cm, unbranched or branched at base; rachis gland-tipped pilose; bracts linear, 4-4.5 × ca. 0.8 mm, apex acuminate; bracteoles linear, ca. 2 mm. Flowers alternate. Pedicel 2-3.5 mm. Calyx ca. 5 mm, outside pubescent with gland-tipped trichomes; lobes triangular-ovate, ca. 4 × 1 mm, unequal with lateral 2 lobes smaller, margin ciliate with gland-tipped trichomes. Corolla white, funnel-shaped, ca. 7 mm; lobes suborbicular, ca. 1.5 × 1.3 mm, subequal. Stamens with longer pair ca. 3 mm and shorter pair ca. 2 mm; filaments glabrous; anther thecae ca. 1 mm, those of longer pair of stamens slightly exserted. Ovary ellipsoid, ca. 2 mm; ovules in 2 rows per locule, 12 in each row; style ca. 3 mm, glabrous; stigma 2-cleft. Capsule cylindric, 5-7 mm. Fl. Dec-Apr.
Forests; 300-1800 m. Yunnan [Vietnam].