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Species Limits and Hypotheses of Hybridization of Solanum berthaultii Hawkes and S. tarijense Hawkes: Morphological Data

David M. Spooner and Ronald G. van den Berg
Taxon
Vol. 41, No. 4 (Nov., 1992), pp. 685-700
DOI: 10.2307/1222394
Stable URL: http://www.jstor.org/stable/1222394
Page Count: 16
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Species Limits and Hypotheses of Hybridization of Solanum berthaultii Hawkes and S. tarijense Hawkes: Morphological Data
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Abstract

Solanum berthaultii Hawkes and S. tarijense Hawkes have been recognized as distinct species by all authors since their description in 1944. Some authors have considered them as sister species, but more recently they have been treated as unrelated species belonging to separate superseries. Hypotheses of species boundaries and hybridization have been examined using principal components analysis, stepwise discriminant analysis, canonical discriminant analysis, and one-way analysis of variance. 25 morphological characters measured on four individuals from each of 84 living accessions from throughout their natural range were analysed. Extensive intra-accession, intraspecific, and interspecific variability have been found in many characters, including those previously given great taxonomic weight. 9 characters show no statistically significant differences between species or putative interspecific hybrids. The remaining 16 characters show statistically significant differences between species and putative hybrids, but show so much variability that repeatable identifications of some accessions would require the use of population samples. The data suggest the possibility that the two species should be treated as one. Other currently-recognized species within S. sect. Petota may need to be reevaluated for synonymy. The results also question the hypotheses of extensive hybridization, interpretation of series designations, and the phylogenetic interpretation of corolla shape at the superseries level in S. sect. Petota.

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