Molecular phylogenetics and morphology of Beaucarnea (Ruscaceae) as distinct from Nolina, and the submersion of Calibanus into Beaucarnea

Taxon - Tập 63 Số 6 - Trang 1193-1211 - 2014
Vanessa Rojas-Piña1, Mark E. Olson1, Leonardo O. Alvarado‐Cárdenas2, Luis E. Eguiarte3
1Departamento de Botánica Instituto de Biología Universidad Nacional Autónoma de México Tercer Circuito s/n Ciudad Universitaria Coyoacán México D.F. C.P. 04510 México
2Laboratorio de Plantas Vasculares Departamento de Biología Comparada Facultad de Ciencias Universidad Nacional Autónoma de México Apartado Postal 70-399 México D.F. C.P. 04510 México
3Laboratorio de Evolución Molecular y Experimental Departamento de Ecología Evolutiva Instituto de Ecología Universidad Nacional Autónoma de México Tercer Circuito s/n Ciudad Universitaria Coyoacán México D.F. C.P. 04510 México

Tóm tắt

AbstractDespite the economic importance and longstanding worldwide commercialization of representatives of the Beaucarnea lineage, it remains poorly known systematically. One of the main systematic problems is lack of certainty regarding the validity of the genus itself. Some authors consider Beaucarnea a synonym of its close relative Nolina, whereas others consider Beaucarnea a distinct genus. In addition to the Beaucarnea vs. Nolina controversy, the boundary between Beaucarnea and Calibanus is an issue that has not yet been addressed. Here we show that Beaucarnea is a well‐supported entity, distinct from Nolina on molecular and morphological grounds. Additionally, we demonstrate the absence of reciprocal monophyly between Beaucarnea and Calibanus and formally include Calibanus within Beaucarnea. These decisions were based on maximum parsimony, Bayesian, and maximum likelihood analyses of datasets including ten species of Beaucarnea, two species of Calibanus, six species of Nolina, and five species of Dasylirion, with sequences from the nuclear ITS and plastid trnL‐F and ycf1 regions. Our taxonomic decisions were also based on morphological observations of herbarium specimens and on the literature. We illustrate the diagnostic features of the genera with phylogenetic character mapping. Finally, we offer a redescription of Beaucarnea to accommodate the former Calibanus species and give a key to the taxonomically valid Beaucarnea species.

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Taxon

Tập 63 Số 6

1193-1211

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