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CCDB → Angiosperms → Piperaceae → Piper → Piper retrofractum Vahl
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| Piper officinarum (Miq.) C. DC. | Piper retrofractum Vahl | 26 | IPCN online | Samuel, R. & W. Morawetz. 1989. Chromosomal evolution within Piperaceae. Pl. Syst. Evol. 166: 105–117. | |||
| Piper chaba Hunter | Piper retrofractum Vahl | 24 | Kumar, 1987 | Janaki Ammal, E.K. (D. 1945) | |||
| ! | Piper chaba Hunter | Piper retrofractum Vahl | 24 | Fedorov, 1974 | Janaki Ammal | ||
| ! | Piper chaba Hunter | Piper retrofractum Vahl | 24 | Fedorov, 1974 | D. 1945) | ||
| ! | Piper chaba Hunter | Piper retrofractum Vahl | 24 | Darlington, 1955 | EKJ* |