Solanum quitoense belongs to the Leptostemonum clade of Solanum (Bohs, 2005). Within Leptostemonum, it belongs to the Lasiocarpa clade, a monophyletic group that includes most of the species traditionally recognized in Solanum section Lasiocarpa Dunal (Whalen et al., 1981; the S. quitoense species group of Whalen, 1984; Levin et al., 2006). Within this clade, chloroplast sequences from the trnT-F region indicate that S. quitoense belongs to a clade that also includes S. candidum, S. hyporhodium, S. lasiocarpum, S. felinum, S. pseudolulo, S. repandum, and S. vestissimum (Bohs, 2004). Resolution is poor to non-existent among the species of this latter clade.
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