2n = 2x = 24 (Ochoa 11314, F, NY).
Solanum multiinterruptum is endemic to central Peru from the Departments of Ancash, Huancavelica, and Lima; in a wide range of habitats, often among rocks and among boulders, and in from grasslands, among cacti or shrubs and herbs; 2675-3900 m.
Solanum multiinterruptum is a member of Solanum sect. Petota Dumort., the tuber-bearing cultivated and wild potatoes. Within sect. Petota, Solanum multiinterruptum is a member of a distinctive clade of southern Ecuadorian and Peruvian species formerly classified in series Piurana and some other series that frequently possess moniliform tubers and shiny coriaceous leaves (Ames et al. 2008; Ames and Spooner 2010; Spooner et al. 2014). On a higher taxonomic level, it is a member of the informally-named Potato Clade, a group of perhaps 200-300 species that also includes the tomato and its wild relatives (Bohs 2005).
Ames and Spooner (2010) showed S. multiinterruptum to be a member of the distinctive clade of southern Ecuadorian and Peruvian species formerly classified in series Piurana and some other series that frequently possess moniliform tubers and shiny coriaceous leaves. However, this species lacks moniliform tubers and has chartaceous, not coriaceous leaves, but the leaves are subglabrous like many members of this clade and Ochoa (1999) mentions that the tubers can be “submoniliform”.
Solanum multiinterruptum was considered to a very diverse species (Ochoa, 1999), a decision followed by Spooner et al. (2014). Some of the more pubescent morphotypes of this species were given names that we now here place as synonyms of S. candolleanum (Solanum multiinterruptum f. longipilosum and S. multiinterruptum var. machyanbinum).
Ames, M., A. Salas, and D.M. Spooner. 2008. A morphometric study of species boundaries of the wild potato Solanum series Piurana (Solanaceae) and putatively related species from seven other series in Solanum sect. Petota. Syst. Bot. 33: 566-578.
Ames, M., and D.M. Spooner. 2010. Phylogeny of Solanum series Piurana and related species in Solanum section Petota based on five conserved ortholog sequences. Taxon. 59: 1091-1104 + 4-pg. foldout (tree).
Bohs, L. 2005. Major clades in Solanum based on ndhF sequences. Pp. 27-49 in R. C. Keating, V. C. Hollowell, & T. B. Croat (eds.), A festschrift for William G. D’Arcy: the legacy of a taxonomist. Monographs in Systematic Botany from the Missouri Botanical Garden, Vol. 104. Missouri Botanical Garden Press, St. Louis.
Ochoa, C.M. 1999. Las Papas de Sudamerica: Peru (Parte I). Lima: International Potato Center.
Spooner, D.M., M. Ghislain, R. Simon, S.H. Jansky, and T. Gavrilenko. 2014. Systematics, diversity, genetics, and evolution of wild and cultivated potatoes. Bot. Rev. 80: 283-383.