From the Greek di, double, and podion, a little foot, in allusion to the two stipites of the pollinia that are attached to the viscidium. (PC).
WCM Protologue Reference:
R.Br., Prodr. Fl. Nov. Holl.: 330 (1810)
Terrestrial or climbing herbs, either with erect, climbing, woody or brittle, leafy stems of indefinite growth, rooting throughout, or leafless holomycotrophic plants growing from a subterranean rhizome with brittle roots. Leaves, when present, distichous, conduplicate, brittle–fleshy, lanceolate, acuminate, ribbed, imbricate and sheathing stem at base. Inflorescences erect, racemose; in leafy species, lateral from upper leaf axils; in leafless species, solitary, apparently terminal but actually lateral from an upper subterranean node of rhizome; bracts persistent. Flowers resupinate, fleshy, showy, pink to deep purple or white, pale yellow or yellowish green, spotted with purple or red; pedicel longer than ovary. Dorsal sepal erect, free, oblanceolate to obovate; lateral sepals similar, spreading. Petals similar but smaller than sepals. Labellum fleshy, porrect, trilobed, lateral lobes linear, smaller than midlobe, midlobe elliptic to obovate, convex, pubescent; callus absent or 1- or 2-ridged. Column fleshy, straight, pubescent at base; anther cap obovoid; pollinia two, cleft; stipites apparently two (one deeply bifurcate), linear; viscidium ovoid to triangular. (PC).