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Morphometric studies and taxonomic delimitation in Menonvillea scapigera and related species (Cremolobeae: Brassicaceae)

Diego L. Salariato, Fernando O. Zuloaga and Ihsan A. Al-Shehbaz
Plant Systematics and Evolution
Vol. 298, No. 10 (December 2012), pp. 1961-1976
Published by: Springer
Stable URL: http://www.jstor.org/stable/43558393
Page Count: 16
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Morphometric studies and taxonomic delimitation in Menonvillea scapigera and related species (Cremolobeae: Brassicaceae)
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Abstract

Previous systematic treatments of Menonvillea recognized a group of six morphologically related species, the 'M. scapigera group,' distinguished by having pinnately lobed leaves and united filaments of median staminal pairs. The number of recognized species ranged from six to two, one with three subspecies. In order to clarify the taxonomy of this group, multivariate and univariate analyses of qualitative and quantitative characters from herbarium specimens were performed. Additionally, to test the morphological results, the phylogenetic relationships and degree of exclusive ancestry were studied using ITS sequences and the genealogical sorting index. Our results support the recognition of three species (M. famatinensis, M. hirsuta, M. scapigera) delimited by a unique combination of qualitative characters. Quantitative characters support the division of the latter species into two subspecies: scapigera and longipes. The molecular data are congruent with the morphology and support the inclusion of M. hookeri within M. scapigera. A key to taxa of the M. scapigera group is presented.

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