Variación morfológica de Coryphantha (Cactaceae): un enfoque multivariado

Acta Botanica Mexicana

Armando Cervantes-Sandoval¹  Balbina Vázquez-Benítez²  Salvador Arias² 

[1] Universidad Nacional Autónoma de México, Facultad de Estudios Superiores Zaragoza;Universidad Nacional Autónoma de México, Instituto de Biología

关键词: análisis de conglomerados;    análisis discriminante;    Cactaceae;    Coryphantha;    taxonomía;   

DOI  :  10.21829/abm116.2016.1117

学科分类：植物学

来源: Acta Botanica Mexicana

【 摘 要 】

Coryphanthaconsists of 43 to 67 species. This genus exhibit patterns of morphological variations that have been understood differently and have led to an unstable taxonomy, resulting in the fact that a consensus on the delimitation of species has yet to be reached. Previous classifications are based on qualitative characters. In order to clarify and circumscribe species ofCoryphantha , different multivariate analysis techniques were used. A total of 1840 individuals among 48 taxa were examined; 467 in the field and 1373 from herbarium specimens. We used 28 vegetative and reproductive characters of which 17 were quantitative and 11 qualitative. Cluster analysis indicated the presence of two major groups based on the presence or absence of extrafloral glands. Discriminant analysis for each subgroup consisting of the cluster analysis allowed circumscription based on morphometric variables of the majority of the analyzed species. Based on morphological characters and multivariate analysis, recognition of taxonomic categories at species or subspecies level is discussed. 45 species and three subspecies are recognized.

【 授权许可】

CC BY-SA