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Species limits and hypotheses of hybridization of Solanum berthaultii Hawkes and S. tarijense Hawkes: morphological data
Author(s) -
Spooner David M.,
Berg Ronald G.
Publication year - 1992
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.2307/1222394
Subject(s) - biology , intraspecific competition , interspecific competition , taxon , hybrid , phylogenetic tree , population , zoology , range (aeronautics) , taxonomy (biology) , evolutionary biology , botany , genetics , demography , materials science , sociology , composite material , gene
Summary Spooner, D. M. & Berg, R. G. van den: Species limits and hypotheses of hybridization of Solanum berthaultii Hawkes and S. tarijense Hawkes: morphological data. ‐ Taxon 41: 685‐700. 1992. ‐ ISSN 0040‐0262. 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 .