Viney epiphyte or arching terrestrial shrub to 2 m tall; mature stems green becoming reddish brown, drying brown, subterete, glabrous; bark thin, cracking into longitudinal strips; immature branches and twigs of the new growth sub-terete, glabrous to densely hirsute distally. Leaves coriaceous, entire, elliptic or ovate elliptic, (4.5-)8-12(-13.5) cm long, (2.5-)3-7 cm wide, basally rounded and cordate, apically acuminate, dark green above and paler beneath, drying olive to grayish brown, glabrous above, sparsely to moderately hirsute beneath along the principal veins, the lower surface also with numerous minute glandular fimbriae; pinnately veined with 3 pairs of lateral nerves, the veins impressed above and raised beneath causing the leaves to be bullate, proximal 1-2 cm of midrib conspicuously thickened above; pseudostipules (bud scales) lanceolate, subulate, ca. 3 mm long, hirsute; petioles terete, rugose, hirsute, becoming gla-brous, 5-9 mm long, 2-2.5 mm in diameter. Inflorescence axillary but often ap-pearing terminal, racemose or subcorymbose, 8-17-flowered, the rachis, the pedicels, the bracteoles, the calyx and the corolla totally green; rachis 1-1.5 cm long, subterete, reddish brown, glabrous or sparsely hirsute, densely glandular fimbriate; floral bracts linear lanceolate, 3-9 mm long, ca. 1 mm wide, hirsute, glandular fimbriate, conspicuously nerved; pedicels terete, striate, sparsely hirsute, densely glandular fimbriate, ca. 15 mm long, 1 mm in diameter, elon-gating to 26 mm after anthesis, articulate with the calyx; bracteoles linear lanceolate, 5-8 mm long, ca. 0.5 mm wide, hirsute, glandular fimbriate. Flowers with the hypanthium and free portion of the calyx 7-9 mm long, sparsely to moderately hirsute and glandular fimbriate, the hypanthium cylindric, 10-ribbed, slightly angled opposite the sinuses, 2-2.5 mm long 2-3 mm in diameter; calyx limb campanulate, 5.5-7 mm long including the lobes, the lobes oblong or ovate, acute, often basally slightly imbricate, 5-6 mm long, 1.7-3 mm wide, conspicuously nerved; corolla cylindric, sparsely hirsute and glandular fimbriate especially on the surface of the lobes, 11-12 mm long, 5.5-7.5 mm in diameter, the corolla lobes triangular, ca. 3 mm long, basally ca. 3 mm wide; stamens 10, ca. 8 mm long, the filaments distinct, ca. 3 mm long, broadest basally, marginally densely sericeous especially on the connective, translucent when fresh, the anthers ca. 7 mm long, strongly curved inwards at the base, the thecae granular, ca. 3 mm long, orangish brown when fresh, the tubules ca. 4 mm long, sparsely pilose, dehiscing by laterally oriented apical slits ca. 1.5 mm long, yellowish brown; style included, glabrous, 9-10 mm long.
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