The Leptostemonum clade of Solanum contains approximately 350–450 species, including the cultivated eggplant, S. melongena. This clade is characterized by the presence of prickles and apically attenuate anthers. Solanum section Androceras, the focus of this study, is a group of ca. 12 species belonging to the Leptostemonum clade. This section is unusual in the genus because of its mostly north temperate distribution and distinctive zygomorphic, heterantherous, and enantiostylous flowers. We infer phylogenetic relationships among 43 Solanum taxa, including 11 species and all varieties of sect. Androceras, using DNA sequence data from two nuclear regions (ITS and the granule-bound starch synthase gene [GBSSI or waxy]) and the chloroplast region trnT-F. The combined phylogenetic tree supports sect. Androceras as a monophyletic group sister to Solanum sect. Crinitum. Only one of the three series proposed by previous taxonomists, ser. Pacificum, is supported as monophyletic. Solanum tenuipes from the northern Chihuahua Desert is sister to the remaining species in sect. Androceras. Species-level relationships were also examined and it was found that two species, S. heterodoxum and S. citrullifolium, are not monophyletic. The ancestral flower color in sect. Androceras appears to be violet, with white and yellow flowers restricted to more derived clades. Characters formerly used to diagnose ser. Androceras, such as exclusively branched hairs and lack of complex foliar flavonoids, appear to have evolved more than once in the section.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.