Vines (the Panama species), often high-climbing, generally with fibrous, often tuberiferous roots and resupinate leaves, the stem unbranched, terminating in an umbel of showy flowers, the rays simple or branched; perianth funnel-shaped, the tube none, the outer segments (sepals) prevailingly oblong or oblanceolate, firm in texture, the inner (petals) unguiculate, thinner than the sepals and sub-equaling or exceeding them; anthers oblong, basifixed; fruit usually 3-angled and dehiscent, with red, subglobose seeds.
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