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|1 Woody vine, climbing by axillary tendrils; leaves 2-foliolate|
|1 Tree; leaves simple, 2-lobed.|
|..2 Stems with stipular spines at or near the nodes; stamens 10; corolla white|
|..2 Stems lacking spines; stamens 3 or 5; corolla white, pink, or purple.|
|....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|