17. Calanthe petelotiana Gagnepain, Bull. Soc. Bot. France. 79: 163. 1932.
圆唇虾脊兰 yuan chun xia ji lan
Plants ca. 30 cm tall. Rhizome inconspicuous. Pseudobulbs very small, enclosed in leaf sheaths. Leaves 2 or 3, not deciduous; blade oblanceolate, ca. 30 × 5.5-8 cm, abaxially puberulent, apex subacute; petiole-like base 14-22 cm, usually forming a pseudostem 15-17 × ca. 1 cm. Scape arising from leaf axil, erect, 20-22 cm, puberulent; rachis 6-12 cm, ca. 10-flowered; floral bracts persistent, lanceolate, 5-7 mm, puberulent. Flowers white, tinged with pale purple, thinly textured; pedicel and ovary ca. 18 mm, puberulent. Dorsal sepal ovate-lanceolate, ca. 16 × 7 mm, abaxially puberulent, 5-veined, apex acute; lateral sepals ovate, slightly oblique, ca. 18 × 9 mm, abaxially puberulent, 5-veined, apex acute. Petals oblong, ca. 15 × 4-5 mm, glabrous, 3-veined, apex acute; lip adnate to entire length of column wings, elliptic, ca. 8 × 14 mm, base subtruncate, margin unlobed, apical margin undulate, apex emarginate and mucronate in sinus; disk with 3 or 5 fleshy lamellae; lamellae thickened toward apex, sometimes minutely crested; spur straight, cylindric, ca. 28 mm, attenuate toward apex, outside puberulent, densely villous around mouth. Column ca. 5 mm, thick, dilated toward apex, puberulent, wings slightly decurrent to lip and connecting to lamellae on disk; rostellum 2-lobed; lobes ca. 2.1 mm; anther cap beaked; clinandrium densely puberulent; pollinia obovoid, ca. 2 mm; viscidium suboblong, small. Fl. Mar.
Damp places in forests; ca. 1700 m. NW Guizhou, SE Yunnan [N Vietnam].