Plants scapose, 13–60 cm tall. Leaves 3–6, mostly in a basal rosette, subsessile to long-petiolate, 2–17 cm long (including the petiole), 1–5.5 cm wide, oblong-elliptic, obovate or oblanceolate, obtuse or subacute, glaucous on the lower surface. Peduncle erect, glandular-pubescent, terminated by a laxly several-flowered raceme 5–24 cm long. Flowers white-green, marked with green. Floral bracts 5–10 mm long, ovate-lanceolate to narrowly lanceolate, acuminate, glandular. Pedicellate ovaries 10–22 mm long, rather stout, glandular. Dorsal sepal 3.8–7.5 mm long, 2–3 mm wide, oblong-elliptic to elliptic-lanceolate, obtuse to subacute, 3- or 5-veined. Petals subsessile, four to eight mm long, 1.5–5 mm wide at the base, obliquely triangular to semicordate, incurved, dilated on the outer margin at the base, somewhat constricted near the apex, obtuse to subacute, mostly ciliate along outer margin, 3-veined, veins branching. Lateral sepals 4.3–8 mm long, 2.5–4 mm wide, free to the base, broadly ovate to ovate-oblong, oblique, somewhat falcate at the apex, obtuse to acute, 5-veined. Lip shortly unguiculate, claw one to two mm long; lamina 4–7.5 mm long, 2.5–6 mm wide when spread out, suborbicular to transversely elliptic in general outline, concave with the lateral margins upturned, truncate or subcordate at base, rounded at apex, terminated by a linear, obtuse to acute apical lobe; disc papillose, with an obscure linear median crest. Gynostemium 4.5 mm long in total, shortly stalked (Fig. 9). Ecology: Terrestrial in deep shade in wet tropical forest. Flowering in January, March, May, November.
Notes: This species is similar to P. rostrata, but unlike the latter its lip is unguiculate. The claw is narrow, canaliculated, with thin margins, what separates it from P. castanedae. The truncate petals base distinguishes P. racemosa from both P. micromystax and P. camargoi