From Mexico, where this monotypic genus is found, and the Greek ‘pedilon’, a slipper or shoe. (Pridgeon et al., 1999).
WCM Protologue Reference:
V.A.Albert & M.W.Chase, Lindleyana 7: 173 (1992)
Small lithophytic, colony-forming herbs with elongate, fibrous roots arising from an elongated rhizome; rhizome elongate, with 5-12 internodes between growths, covered by numerous sheaths. Erect shoots leafy, well-spaced, glabrous, the base enclosed by two to three sheathing sterile bracts, five- to eight-leaved above. Leaves coriaceous, conduplicate, spreading or suberect, ligulate or oblong, obtuse, mucronate at apex, clear green on upper surface, lighter green below, glabrous, ciliate or not on the margins. Inflorescence terminal, paniculate with one branch developing from the median sterile bract, 3- to 7-flowered, the flowers borne in succession; peduncle of 2 nodes, elliptic in cross-section, with a central conduplicate sterile bract; rachis abbreviated, hirsute; bracts imbricate, distichous, conduplicate, cymbiform, hairy, ciliate, the hairs multicellular. Flowers thin-textured, deciduous, lacking a scent, relatively small, white, densely brown-pubescent on the outer surface of the sepals, vernation valvate; pedicel obscure to short; ovary unilocular, three-ribbed, densely covered with multicellular hairs, placentation parietal. Dorsal sepal hooded over lip, elliptic, acute or subacute, pubescent on the outer surface, sometimes pubescent within at base, ciliate or not. Lateral sepals fused to form a concave synsepal that is pendent and sub-orbicular, obtuse or with two subacute tips, densely pubescent on outer surface. Petals free, incurved, oblong-ligulate, acute at apex, glabrous or ciliate at the base. Lip deeply pouched and inflated, slipper-shaped, subglobose, with very obscure incurved side lobes, apical margins strongly incurved, glandular hairy within especially on lower surface, glabrous on outer surface, apparently lacking translucent windows. Column short, stalked, porrect; anthers two, bilocular, borne on short obtuse decurved filaments; pollinia granular, yellow; staminode terminal on column, shortly stalked, transversely oblong, obscurely three-lobed at the apex, convex, glabrous, with a hairy tuft on lower surface; stigma massive, stalked, dependent-curved, surface tripartite, the stalk bearing multicellular hairs. Capsule erect, three-ribbed, cylindrical. (PC).