Tall liana or climbing shrub. Internodes of older branches hollow. Leaves subcoriaceous, elliptical or ovate-elliptical, to 18 x 8.5 cm, apex obtuse to acuminate (often also mucronulate), base rounded; petiole 3-14 mm long; stipular thorns recurved, stout, to 12 mm long. Inflorescence an axillary or terminal, profusely (>100) flowered panicle to 50 cm long, sparsely to densely puberulent; bracts acicular, to 5 mm; bracteoles acicular, to 1.5 mm; pedicels 3-9 mm long. Tepals 4.5(-6) x 3.5(-4.5) mm, greenish-yellow, becoming dark on drying; stamens ca. 15-40, filaments to 3.5 mm long, anthers 1.5-2.5 mm; ovary without lateral winglet primordia (enations), becoming black on drying, stigma normally completely lateral. Samara to 4 cm long, becoming black on drying, basal part to 8 mm wide, smooth or somewhat veined, terminal wing widened upwards to 1.6 cm and widest from middle to tip; testa black.
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