Figure 16 from: Holstein N (2015) Monograph of Coccinia (Cucurbitaceae). PhytoKeys 54: 1-166. https://doi.org/10.3897/phytokeys.54.3285

Figure 16 - Hybrids of Coccinia species. a Coccinia grandis ♀ × Coccinia hirtella ♂ b Coccinia hirtella ♀ × Coccinia grandis ♂ c Coccinia grandis ♀ × Coccinia pwaniensis ♂; note that the pollen sacs are not open although the flower is in full bloom indicating sterility d Left flower: male Coccinia sessilifolia, right flower: male flower of Coccinia grandis ♀ × Coccinia sessilifolia ♂ (Coccinia grandis flowers are about equally sized as Coccinia sessilifolia).