J Syst Evol

• Research Articles •    

Phylogenetic relationships within the Mexican genus Bakerantha (Hechtioideae, Bromeliaceae) based on plastid and nuclear DNA: Implications for taxonomy

Katya J. Romero‐Soler1 , Ivón M. Ramírez‐Morillo1 * , Eduardo Ruiz‐Sanchez2 , Claudia T. Hornung‐Leoni3 , Germán Carnevali1,4 , and Néstor Raigoza1   

  1. 1 Unidad de Recursos Naturales, Centro de Investigación Científica de Yucatán, A.C., Mérida 97205, Mexico
    2 Departamento de Botánica y Zoología, Centro Universitario de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara, Guadalajara 44160, Mexico
    3 Área Académica de Biología, Centro de Investigaciones Biológicas, Instituto de Ciencias Básicas e Ingeniería, Universidad Autónoma del Estado de Hidalgo, Pachuca 42039, Mexico
    4 Oakes Ames Orchid Herbarium, Harvard University Herbaria, Cambridge, MA 02138, USA
  • Received:2020-03-27 Accepted:2020-08-14 Online:2020-08-19

Abstract:

Bakerantha is one of the three genera of subfamily Hechtioideae (Bromeliaceae). This genus was re‐established recently, and it currently contains four species (B. caerulea, B. lundelliorum, B. purpusii, and B. tillandsioides), which are distributed throughout the central region of Mexico. Bakerantha tillandsioides has the widest geographical distribution of the four species, and some populations currently referred to it do not match the species description. In this study, we used extensive sampling (81 accessions) of four plastid regions (matK, rpl32trnL, rps16trnK, and ycf1) and the nuclear PRK gene to reconstruct the phylogenetic relationships and delimit the species boundaries in Bakerantha. Our results confirm the monophyly of Bakerantha, and the species delimitation analysis supports five evolutionary lineages within Bakerantha, showing that B. tillandsioides is nonmonophyletic as currently circumscribed. Diagnostic characters and coherent geographical distributions support the five lineages. On the basis of our results, we describe and illustrate B. hidalguense as a new species and provide evidence that B. caerulea is morphologically and ecologically different from B. tillandsioides, with which it has been confused in the past. Additionally, we provide a morphological key to the Bakerantha species.

Key words: biogeographical provinces, IUCN, Mexico, molecular phylogenetics, new species, species delimitation