Nervilia renschiana (Rchb.f.) Schltr., Bot. Jahrb. Syst. 45: 404 (1911).
Homotypic Synonyms:

Pogonia renschiana Rchb.f., Otia Bot. Hamburg.: 73 (1881).
Heterotypic Synonyms:
Nervilia insolata Jum. & H.Perrier, Ann. Fac. Sci. Marseille 31: 192 (1912).
Nervilia grandiflora Schltr., Ann. Transvaal Mus. 10: 241 (1924), nom. illeg.
Nervilia natalensis Schelpe, Orchid Rev. 74: 394 (1966).

This species is very closely related to N. renschiana. Differing in that its petiole is nearly absent leaf, closely set to the soil, at least twice as large (8-24 cm in diameter), orbicular, cordate basally and acuminate acute apically; labellum tipped with a triangular-acute acumin, margins gradually attenuate, not dilate lobed laterally-obtuse; column longer (2-2.2 cm); the 2 crests on the bane of the labellum thinner, separated by a depressed interval, densely villous, taller than the interval, in the lower half the hairs are taller; the anther similar (with tetrads arranged in a linear row, pollina 2 per lobe, without viscidiums, the same size) but provided in front and apically with 2 small points. The anther 4 mm long and 2 mm wide and the rostellum in the form of a strap, 1.5 mm wide and l mm tall.

On limestone rocks, bare, not near the sea; flowering in November-December

Tanzania to S. Africa, Madagascar