Hybrids of Coccinia species. a Coccinia grandis ♀ × C. hirtella ♂ b Coccinia hirtella ♀ × C. grandis ♂ c Coccinia grandis ♀ × C. pwaniensis ♂; note that the pollen sacs are not open although the flower is in full bloom indicating sterility d Left flower: male C. sessilifolia, right flower: male flower of C. grandis ♀ × C. sessilifolia ♂ (C. grandis flowers are about equally sized as C. sessilifolia).