Platylepis A.Rich., Mém. Soc. Hist. Nat. Paris iv. (1828) 34; Orch. Iles Fr. et Bourb. 39. t. 6.
- Genus Coralliokyphos Fleischm. & Rech., Denkschr. Kaiserl. Akad. Wiss.
- Genus Moerenhoutia Blume, Coll. Orchid. (1858) 99
Sympodial terrestrial plants. Stem elongated. Leaves few, sheathing at the base, glabrous, dorso-ventrally flattened, not articulate, convolute, herbaceous. Inflorescence terminal, a raceme. Flowers small, resupinate, usually green or reddish with a white lip. Sepals free. Lateral sepals patent. Petals free, about as long as the dorsal sepal, usually cohering at the apices. Lip without spur, not mobile, concave, laterally constricted below the middle, inside with two keels and two basal tufts of hairs, outside along the margins with more or less well-developed crest-like ornamentation. Column-foot absent. Pollinia 2, sectile, caudicles present, stipe absent, viscidium present. Stigma 1.
In New Guinea genus Platylepis contains the following 4 species:
Key to the species of Platylepis in New Guinea
1a. Lip with 2 keels adaxially on the mesochile == 2
1b. Lip without keels (possibly with thickened midnerve) == 3
2a. Keels thin, plate-like, glabrous. Mesochile of lip without callosities on abaxial surface == Platylepis constricta
2b. Keels thick, densely pubescent. Mesochile of lip wit large, armour-like callosities with lobed-crenate
margins on the abaxial surface == Platylepis intricata
3a. Lip adaxially at the base on either side with a tuft of subulate, sometimes branching, hair-like papillae. Petals
with denticulate margins == Platylepis zeuxinoides
3b. Lip adaxially at the base on either side with a rounded, densely verruculose-rugose appendage. Petls with
entire margins == Platylepis geluana