Epiphytic mostly herbaceous, 30-60(-100) cm long. Stem woody at base, succulent above, ascending and somewhat zig-zag, sparsely to densely pilose towards apex, glabrescent below. Leaves rarely subequal on young shoots, but on mature stems strongly unequal in a pair; petiole 0-0.7 cm long, glabrescent; blade subcoriaceous when dry, lanceolate to elliptic or oblanceolate, subfalcate, blade of larger leaf in a pair 6.5-13.5 x 1.2-5.3 cm, margin entire, ciliate when young, apex acute to acuminate, base subcordate, rounded to acute, occasionally oblique, above glabrous to sparsely pilose, nitid, below glabrous to sparsely pilose along prominent midvein, blade of smaller leaf in a pair bract-like, 0.2-0.5 cm long Flowers in fasciculate 1-2-flowered inflorescences; pedicel 0.3-1.5 cm long, pilose. Calyx narrowly campanulate, green, lobes free, erect to recurved, unequal, lanceolate, 0.4-1.6 x 0.2-0.6 cm, margin entire, apex acuminate, outside pilose, inside pilose; corolla oblique in calyx, when developing in non-cleistogamous flowers white, ca. 2 cm long, tube narrowly funnelform, 2.4-2.9 cm long, base spurred, 0.2-0.3 cm wide, middle ampliate, subventricose on lower side, throat not contracted, ca. 1 cm wide, outside glabrous at base of tube, sparsely pilose above, inside glandular at base of lower lobe, limb ca. 1.8 cm wide, lobes subequal, spreading, rotund, 0.3-0.4 x 0.4-0.6 cm, margin entire; stamens included, adnate briefly to base of corolla tube; ovary strongly laterally compressed, 0.3 x 0.15-0.2 cm, glabrous to pilose, style 1.2-1.5 cm long, glabrous, stigma capitate to stomatomorphic. Mature capsule green to brown, ellipsoid, 1-2 x 0.5-0.7 cm.
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