AI Article Synopsis
- The text discusses a genus of cacti that features unique stem and flower characteristics, and highlights the genus as the second largest in its tribe but lacking a clear phylogenetic framework.
- The study utilizes Bayesian phylogenetic analysis of five chloroplast regions to evaluate relationships among 44 species from this genus and others in the Cacteae tribe.
- Results indicate the genus is monophyletic and suggest a reorganization into two subgenera and seven sections, with 25 new species combinations proposed to reflect updated classifications.
Article Abstract
The genus includes plants with globose to cylindrical stems bearing furrowed tubercles, flowers arising at the apex, and seeds with flattened testa cells. is the second richest genus in the tribe Cacteae. Nevertheless, the genus lacks a phylogenetic framework. The limits of with its sister genus and the infrageneric classification of have not been evaluated in a phylogenetic study. In this study we analyzed five chloroplast regions (, , , , and ) using Bayesian phylogenetic analysis. We included 44 species of and 43 additional species of the tribe Cacteae. Our results support the monophyly of by excluding . + + are corroborated as the sister group of . Within our phylogenetic analyses recovered two main clades containing seven subclades, and we propose to recognize those as two subgenera and seven sections, respectively. Also, a new delimitation of including and all species previously included in is proposed. To accommodate this new delimitation 25 new combinations are proposed. The seven subclades recovered within are morphologically and geographically congruent, and partially agree with the traditional classification of this genus.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8799629 | PMC |
| http://dx.doi.org/10.3897/phytokeys.188.75739 | DOI Listing |
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