| 1 | Native | Africa | East Tropical Africa | Kenya | | | Turrill, W. B. et al., eds. 1952-. Flora of tropical East Africa. |
| 1 | Native | Africa | Northeast Tropical Africa | Chad | | | Dane, F. et al. 2007. Phylogeography of the bitter apple, Citrullus colocynthis. Genet. Resources Crop Evol. 54:327-336. |
| 1 | Native | Africa | Northeast Tropical Africa | Ethiopia | | | Hedberg, I. & S. Edwards. 1989-. Flora of Ethiopia Note: Eritrea added in 2000 |
| 1 | Native | Africa | Northeast Tropical Africa | Somalia | | | Thulin, M., ed. 1993-. Flora of Somalia. |
| 1 | Native | Africa | Northeast Tropical Africa | Yemen | Arkhabīl Suquţrá | | Thulin, M., ed. 1993-. Flora of Somalia. |
| 1 | Native | Africa | Northern Africa | Algeria | | | Greuter, W. et al., eds. 1984-. Med-Checklist. |
| 1 | Native | Africa | Northern Africa | Egypt | | | Levi, A. et al. 2001. Genetic diversity among watermelon (Citrullus lanatus and Citrullus colocynthis) accessions. Genet. Resources Crop Evol. 48:559-566. |
| 1 | Native | Africa | Northern Africa | Libya | | | Renner, S. S. & A. K. Pandey. 2013. The Cucurbitaceae of India: accepted names, synonyms, geographic distribution, and information on images and DNA sequences. PhytoKeys 20:62. |
| 1 | Native | Africa | Northern Africa | Morocco | | | Levi, A. et al. 2001. Genetic diversity among watermelon (Citrullus lanatus and Citrullus colocynthis) accessions. Genet. Resources Crop Evol. 48:559-566. |
| 1 | Native | Africa | Northern Africa | Tunisia | | | Greuter, W. et al., eds. 1984-. Med-Checklist. |
| 1 | Native | Africa | West Tropical Africa | Mali | | | Keay, R. W. J. & F. N. Hepper. 1953-1972. Flora of west tropical Africa, ed. 2. |
| 1 | Native | Asia-Temperate | Arabian Peninsula | Kuwait | | | Townsend, C. C. & E. Guest. 1966-. Flora of Iraq. |
| 1 | Native | Asia-Temperate | Arabian Peninsula | Saudi Arabia | | | Migahid, A. M. 1988-1990. Flora of Saudi Arabia, ed. 3. |
| 1 | Native | Asia-Temperate | Arabian Peninsula | Yemen | | | Wood, J. R. I. 1997. A handbook of the Yemen flora. |
| 1 | Native | Asia-Temperate | Western Asia | Afghanistan | | | Renner, S. S. & A. K. Pandey. 2013. The Cucurbitaceae of India: accepted names, synonyms, geographic distribution, and information on images and DNA sequences. PhytoKeys 20:62. |
| 1 | Native | Asia-Temperate | Western Asia | Cyprus | | | Levi, A. et al. 2001. Genetic diversity among watermelon (Citrullus lanatus and Citrullus colocynthis) accessions. Genet. Resources Crop Evol. 48:559-566. |
| 1 | Native | Asia-Temperate | Western Asia | Egypt | Sinai | | Greuter, W. et al., eds. 1984-. Med-Checklist. |
| 1 | Native | Asia-Temperate | Western Asia | Iran | | | Levi, A. et al. 2001. Genetic diversity among watermelon (Citrullus lanatus and Citrullus colocynthis) accessions. Genet. Resources Crop Evol. 48:559-566. |
| 1 | Native | Asia-Temperate | Western Asia | Iraq | | | Townsend, C. C. & E. Guest. 1966-. Flora of Iraq. |
| 1 | Native | Asia-Temperate | Western Asia | Israel | | | Zohary, M. & N. Feinbrun-Dothan. 1966-. Flora palaestina. |
| 1 | Native | Asia-Temperate | Western Asia | Jordan | | | Zohary, M. & N. Feinbrun-Dothan. 1966-. Flora palaestina. |
| 1 | Native | Asia-Temperate | Western Asia | Lebanon | | | Townsend, C. C. & E. Guest. 1966-. Flora of Iraq. |
| 1 | Native | Asia-Temperate | Western Asia | Syria | | | Townsend, C. C. & E. Guest. 1966-. Flora of Iraq. |
| 1 | Native | Asia-Temperate | Western Asia | Turkey | | s. | Davis, P. H., ed. 1965-1988. Flora of Turkey and the east Aegean islands. |
| 1 | Native | Asia-Tropical | Indian Subcontinent | India | Andhra Pradesh | | Renner, S. S. & A. K. Pandey. 2013. The Cucurbitaceae of India: accepted names, synonyms, geographic distribution, and information on images and DNA sequences. PhytoKeys 20:62. |
| 1 | Native | Asia-Tropical | Indian Subcontinent | India | Assam | | Renner, S. S. & A. K. Pandey. 2013. The Cucurbitaceae of India: accepted names, synonyms, geographic distribution, and information on images and DNA sequences. PhytoKeys 20:62. |
| 1 | Native | Asia-Tropical | Indian Subcontinent | India | Bihar | | Renner, S. S. & A. K. Pandey. 2013. The Cucurbitaceae of India: accepted names, synonyms, geographic distribution, and information on images and DNA sequences. PhytoKeys 20:62. |
| 1 | Native | Asia-Tropical | Indian Subcontinent | India | Delhi | | Renner, S. S. & A. K. Pandey. 2013. The Cucurbitaceae of India: accepted names, synonyms, geographic distribution, and information on images and DNA sequences. PhytoKeys 20:62. |
| 1 | Native | Asia-Tropical | Indian Subcontinent | India | Goa | | Renner, S. S. & A. K. Pandey. 2013. The Cucurbitaceae of India: accepted names, synonyms, geographic distribution, and information on images and DNA sequences. PhytoKeys 20:62. |
| 1 | Native | Asia-Tropical | Indian Subcontinent | India | Gujarat | | Renner, S. S. & A. K. Pandey. 2013. The Cucurbitaceae of India: accepted names, synonyms, geographic distribution, and information on images and DNA sequences. PhytoKeys 20:62. |
| 1 | Native | Asia-Tropical | Indian Subcontinent | India | Karnataka | | Renner, S. S. & A. K. Pandey. 2013. The Cucurbitaceae of India: accepted names, synonyms, geographic distribution, and information on images and DNA sequences. PhytoKeys 20:62. |
| 1 | Native | Asia-Tropical | Indian Subcontinent | India | Maharashtra | | Renner, S. S. & A. K. Pandey. 2013. The Cucurbitaceae of India: accepted names, synonyms, geographic distribution, and information on images and DNA sequences. PhytoKeys 20:62. |
| 1 | Native | Asia-Tropical | Indian Subcontinent | India | Punjab | | Renner, S. S. & A. K. Pandey. 2013. The Cucurbitaceae of India: accepted names, synonyms, geographic distribution, and information on images and DNA sequences. PhytoKeys 20:62. |
| 1 | Native | Asia-Tropical | Indian Subcontinent | India | Rajasthan | | Renner, S. S. & A. K. Pandey. 2013. The Cucurbitaceae of India: accepted names, synonyms, geographic distribution, and information on images and DNA sequences. PhytoKeys 20:62. |
| 1 | Native | Asia-Tropical | Indian Subcontinent | India | Tamil Nadu | | Renner, S. S. & A. K. Pandey. 2013. The Cucurbitaceae of India: accepted names, synonyms, geographic distribution, and information on images and DNA sequences. PhytoKeys 20:62. |
| 1 | Native | Asia-Tropical | Indian Subcontinent | India | Uttar Pradesh | | Renner, S. S. & A. K. Pandey. 2013. The Cucurbitaceae of India: accepted names, synonyms, geographic distribution, and information on images and DNA sequences. PhytoKeys 20:62. |
| 1 | Native | Asia-Tropical | Indian Subcontinent | Pakistan | | | Nasir, E. & S. I. Ali, eds. 1970-. Flora of [West] Pakistan. |
| 1 | Native | Asia-Tropical | Indian Subcontinent | Sri Lanka | | | Renner, S. S. & A. K. Pandey. 2013. The Cucurbitaceae of India: accepted names, synonyms, geographic distribution, and information on images and DNA sequences. PhytoKeys 20:62. |
| 1 | Native | Asia-Tropical | Indo-China | Myanmar | | | Renner, S. S. & A. K. Pandey. 2013. The Cucurbitaceae of India: accepted names, synonyms, geographic distribution, and information on images and DNA sequences. PhytoKeys 20:62. |
| 1 | Native | Europe | Southeastern Europe | Greece | | | Greuter, W. et al., eds. 1984-. Med-Checklist. |
| 1 | Native | Europe | Southeastern Europe | Italy | Sicilia | | Greuter, W. et al., eds. 1984-. Med-Checklist. |
| 1 | Native | Europe | Southwestern Europe | Spain | | | Greuter, W. et al., eds. 1984-. Med-Checklist. |
| 2 | Cultivated | | | | | widely cult. in s.w. Asia and n. Africa | Dane, F. & P. Lang. 2004. Sequence variation at cpDNA regions of watermelon and related wild species: implications for the evolution of Citrullus haplotypes. Amer. J. Bot. 91:1922-1929. |
| 4 | Naturalized | Australasia | Australia | Australia | | | Dane, F. et al. 2007. Phylogeography of the bitter apple, Citrullus colocynthis. Genet. Resources Crop Evol. 54:327-336. |