S. Wats., Proc. Amer. Acad. Arts 23:285.1888
P. acrisepalaAmes & Schweinf.
Caespitose epiphyte; pseudobulbs lacking; stems very short, each bearing a single leaf. Leaves ± oblanceolate, obtuse or acute, 1.5-9 cm long, the veins obscure except the midrib, the base ensheathed in slender, scarious bracts. Flowers 1 to few in terminal fascicles borne on slender peduncles usually above the leaves; peduncles usually persisting; sepals acute, maroon, fused at base, 7-9 mm long, the lateral sepals united to the middle or beyond; petals 2-3.5 mm long, solid maroon, the apex pointed; lip narrow, 2-4 mm long, l-2 mm wide, lighter and papillate at apex, the margin ciliate, auriculate on both sides. Fruits ellipsoid, to 1 cm long, green or olive, tinged or striped with purple. Croat 9787.
Abundant in the forest, perhaps the most abundant orchid on the island; growing high or low in trees. Apparently flowers repeatedly throughout much of the year.
Guatemala to Panama. In Panama, known from tropical moist forest on both slopes of the Canal Zone and in Bocas del Toro, Colón, Panama, and Darién.