Plants up to 35 cm tall. Leaves up to 5, basal, rosulate, petiolate; petiole ca 0.5–1(3) cm long; blade up to 6.5 cm long and four cm wide, ovate to ovate-elliptic, acute above, commonly smaller, glabrous. Peduncle erect, rather slender, pubescent above, loosely 3–5 sheathed, terminated by a laxly several-flowered raceme. Flowers white, occasionally with greenish suffusion, sepals pubescent-glandular outside. Floral bracts up to nine mm long, ovate-lanceolate, acute, glandular-pubescent in the lower part. Pedicellate ovary up to 14 mm long, pubescent-glandular. Dorsal sepal 4.3–8 mm long, 2.1–5 mm wide, elliptic to ovate-elliptic, acute to obtuse, 3- or 5-veined. Petals unguiculate, claw free part ca one to two mm long; blade 4.5–8 mm long, 2.1–4 mm wide, obliquely triangular, apically connivent with dorsal sepal, 2-veined, veins branching, short ciliate only on external margins. Lateral sepals 4.5–9 mm long, 3.3–6 mm wide, oblique, broadly ovate, obtuse, occasionally connivent in natural position to give a bidentate synsepal effect, 5-veined. Lip unguiculate, claw two mm long, semiterete, apically somewhat expanded giving an appearance of narrow triangle; lamina 2.5–3 mm long, 2.5–5 mm wide, at right angle with claw, 3-lobed apically, obtriangular-obovate in outline from cuneate base, apex truncate, concave-conduplicate, glabrous; the middle lobe linear-lanceolate, acute; lateral lobes triangular, erect, obtuse. Gynostemium three mm long, massive, shortly stalked
(Fig. 18).
Ecology: Terrestrial. Flowering in March, May, and August.
Distribution: Peru, Ecuador, Colombia, Venezuela. Alt. 2,000–3,200 m

Notes: P. parvilabris is almost similar to P. lilacina, but the lip of this species is devoid of any thickened plates.