2. Ophiorrhiza alatiflora H. S. Lo, Bull. Bot. Res., Harbin. 10(2): 62. 1990.
延翅蛇根草 yan chi she gen cao
Herbs or subshrubs, suberect; stems stout, terete to slightly compressed. Leaves in subequal pairs; petiole 1-1.5(-4) cm, pilosulous; blade drying papery to thickly papery, black adaxially, pale brown abaxially, ovate or oblong-ovate, 5-13 × 2-7 cm, glabrous on both surfaces or hirtellous along principal veins abaxially, base cuneate, rather inequilateral, margins subentire, apex shortly acuminate or subacute; secondary veins 7-12 pairs; stipules caducous, not seen. Inflorescence congested-cymose, many flowered, densely pubescent; peduncle 1-4 cm; axes 0.5-4 cm, helicoid; bracteoles narrowly lanceolate, 7-12 mm, acute, glabrous or sparsely ciliate. Flowers distylous, subsessile. Calyx densely pilosulous to puberulent; hypanthium turbinate, ca. 1.5 mm, 5-ribbed; lobes subtriangular or triangular, 0.5-0.7 mm, with 1 globose gland in each sinus. Corolla white striped with purple, subtubular or slightly swollen at base, outside glabrous and winged along entire length, inside with a ring of pubescence just below throat and/or in throat and onto lobes; tube 12-15 mm; lobes subovate, 2-3 mm, dorsally with wing 0.8-1 mm wide, apex rostrate. Capsules mitriform, ca. 3 × 10 mm, pilosulous.
● Forests. Yunnan.
The protologue described both of the floral forms in detail, noting explicitly that the corollas are similar and the anthers and stigmas reciprocally placed, near the middle of the corolla tube and at or just below the throat, respectively. However, the protologue figure shows partially different patterns of internal corolla pubescence in the two floral forms, with the pubescence restricted to a narrow ring well below the throat in the long-styled flowers but located in the throat of the short-styled flowers.
The varieties treated by H. S. Lo in FRPS (71(1): 160. 1999) are treated here for reference. The protologue figure was not fully labeled but apparently illustrated only var. alatiflora; these same figures were reproduced in FRPS (p. 161, t. 41, f. 1-8) where they were explicitly labeled as var. alatiflora.