Growth form Epiphyte. Rhizome not seen. Roots filiform, flexible, glabrous. Stem cylindrical, slightly compressed, proliferously leafed, completely covered by leaf sheaths, internodes 1.9-3 cm long. Leaf lanceolate, erect, crowded, obtusely concave, below obtusely convex, margin above minutely cartilaginous crenulate, above minutely transversely warty, punctate, carnose, coriaceous, rigid; apex unequal 2-lobed, both lobes obtuse; base half-twisted; lamina 7-12 cm long, up to 1.2 cm wide; sheath surpassing internodes, tubular, warty, punctate; apex without tooth, notched, with glabrous margin. Inflorescences terminal, many-flowered, nodding, 2 cm in diameter, when young enveloped by a spathe. Spathe ovate to orbicular, strongly concave above, keeled, finely punctate, apex acuminate, up to 2.3 cm long; floral bracts transparent, thin, subovate to lanceolate, apex long acuminate, narrowly obtuse or acute, 1.6-1.8 cm long, 0.5-0.7 cm wide. Flowers upright, glabrous. Median sepal oblong, at base concave, above convex, 3-nerved, apex obtuse, 0.75 cm long, 0.34 cm wide. Lateral sepals clasping the spur, obliquely oblong-triangular, at base 0.48 cm connate, 5-nerved, apex acute, subulate-apiculate, 0.73 cm long, to the apex of the mentum 0.83 cm long, 0.4 cm wide; mentum pointing backward, rounded, laterally compressed, 0.15 cm long, 0.25 cm wide. Petal obliquely oblong, in basal part concave, above convex, 3-nerved, apex obtuse, minutely apiculate, 0.67 cm long, 0.3 cm wide. Lip adnate to the base of the column, entire, to the tip of the spur 0.55 cm long, up to the apex of the ovary 0.48 cm long, quadrangular, recurved, above inside with small longitudinal rib, glabrous, 0.34 cm long, 0.3 cm wide; epichile rounded-truncate, obtusely apiculate, at base transversely thickened; hypochile spurred; spur saccate, apex broadly rounded, laterally compressed, up to the apex of the ovary 0.2 cm long, in front 0.34 cm long, at the base 0.25 cm high. Column curved, dorsally convex, 0.28 cm long;column foot present; clinandrium on either side less notched, denticulate, apex filament triangular; stelidia oblong, sometimes bidentate. Anther cucullate, orbicular, apex retuse, membranous-marginate, base strongly conical-raised; pollinia not seen; rostellum broad, shortly bilobed; stigma cup-shaped, margin strongly elongated, narrow, incurved, together with rostellum forming a quadrangular; viscidium not seen. Ovary clavate, 3-ribbed, glabrous, 0.6 cm long. Capsule not seen.
Distribution – Indonesia.
Habitat and Ecology - Epiphyte in upper montane forest around Memberamo. Altitude 2500-3100 m. Flowering in October in the wild.
Notes - 1. Flowers white with an orange lip.
2. The epithets palustris and subintegra refer to the streambed forest habitat where the species can be found and the slightly entire lip of the flower (palustre means growing in wet areas and subintegra means slightly entire in Latin).
3. Specimen observed: Lam 1829.