HABIT : evergreen climbing herbs, stem epidermis becoming distinctly corky and longitudinally furrowed with age. LEAVES : large, juvenile leaves unknown. PETIOLE : geniculate apically, thickened at base, sheath short. BLADE : pinnatifid, subcordate, lobes (pinnae) acute, falcate, 4-6 per side, primary lateral veins 1 per lobe (pinna), secondary laterals ± parallel-pinnate, higher order venation reticulate. INFLORESCENCE : solitary. PEDUNCLE : shorter than petiole. SPATHE : ovate-cymbiform, deciduous. SPADIX : stipitate, cylindric, apex obtuse. FLOWERS : bisexual, perigone absent. STAMENS : 4, filaments flattened, free or connate, shorter than ovary, thecae oblong, dehiscing laterally by oblique, apical, pore-like slit. POLLEN : not fully zonate, ellipsoid, medium-sized (mean 46 µm), exine shallowly foveolate. GYNOECIUM : ovary prismatic, 1-locular, with abundant locular mucilage, ovule 1, amphitropous, funicle with trichomes, placenta basal, stylar region densely packed with trichosclereids, stigma sessile, elliptic. BERRY : unknown. SEED : unknown.