The corolla of Ipomoea ommaneyi is bright rose-magenta in its central, narrow or tubular part, pale to whitish in the spreading, fused, upper lobes. The style has two, spherical stigma lobes. The corolla is about 7 cm long.

A globose capsule follows the flower, enclosed in the calyx of green sepals or bracts. The ripe seeds of this plant are black (Van Wyk and Malan, 1997; JSTOR).