Heteropsis robusta (G.S.Bunting) M.L.Soares

Plant scandent, branches slender, aerial roots 3 – 6 mm diam., greyish; internodes 2 – 5 cm × 2.6 – 4 mm, longitudinally striate when dried, quadrangular, yellowish; lateral buds 1 – 1.5 mm long, straight, apex sharply pointed. Leaf: petiole 3 – 7 × 1.2 – 2 mm, margin slightly sinuate; geniculum 2 – 4 mm long; leaf blade 10 – 24 × 4 – 8 cm, ovate-lanceolate, dark green when fresh on both surfaces, dark green to pale brown when dried, matt, membranaceous, 1.3 – 2.6 mm thick, apex 1 – 3 cm long, caudate, base obtuse to shortly attenuate, margin slightly sinuate, midrib sulcate on upper surface, prominent, yellowish on lower surface, primary and secondary lateral veins arched in the direction of the apex, more easily seen on lower surface, submarginal collective vein 2 – 3 mm from the margin, with an outer submarginal vein. Inflorescence: terminal and axillary, floral shoot 3 – 6.5 cm long, slender, internodes 1 – 2.5 cm × 1.3 – 1.7 mm, yellowish when dry, slightly quadrangular; peduncle c. 0.1 cmlong; spathe 2 – 2.5 × c. 2 cm, (closed spathe 2 × 0.7 – 0.9 cm) yellow on both surfaces, inflated, convolute, apex acuminate; spadix 1.5 – 2.5 × 0.6 – 1 cm, cylindric, yellowish-white, apex rounded to acuminate, stipitate; stipe 2 – 3 × 1.1 – 1.6 mm. Flowers: stamens c. 0.8 mm long, 0.7 mm wide; gynoecium: c. 1.25 × 0.8 mm, prismatic; locules 1 – 2 per ovary; ovules 1 – 2 per locule, anatropous; placentation sub-basal; stigma discoid to subdiscoid. Infructescence: 3 – 5.5 cm × 2 – 3.5 mm; berry obovoid, orange, 0.8 – 1.3 cm × 5 – 9 mm, apex 2 – 4 mm diam.; seed 0.6 – 0.9 × 0.4 – 0.6 cm, subobovoid.