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1 Woody vine, climbing by axillary tendrils; leaves 2-foliolate
..2 Stems with stipular spines at or near the nodes; stamens 10; corolla white
....3 Functional stamens 3; petals ca. 1.5 (-2) cm wide, not overlapping; flower buds clavate and also slightly winged towards the tip; spathiform calyx splitting along 2 lines
....3 Functional stamens 5; petals 1.5-3 cm wide, overlapping; flower buds spindle-shaped, tapering to the tip; spathiform calyx splitting along a single line