A key to the genus Plectrelminthus Raf.

1.a Stem rather short, rarely up to 15 cm. long; leaves closely imbricate at base, oblong or elliptical-oblong, almost equally bilobed at apex with rounded lobes, 10-30 cm. long, 1.5-3.5 cm. broad; inflorescence 25-60 cm. long, 4-10-flowered; sepals and petals lanceolate-linear, acuminate, the former 3.5-5 cm. long; lip about as long as the sepals, 1-2.5 cm. broad in the middle; spur 17-25 cm. long, spirally twisted. Plectrelminthus caudatus

World Checklist of Monocotyledons. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; accessed 12/03/2017