The tree flora of Michoacan, Mexico

  • Eva M. Cué-Bär Centro de Investigaciones en Ecosistemas, Universidad Nacional Autónoma de México
  • José Luis Villaseñor Departamento de Botánica, Instituto de Biología, Universidad Nacional Autónoma de México
  • Libertad Arredondo-Amezcua Centro de Investigaciones en Ecosistemas, Universidad Nacional Autónoma de México
  • Guadalupe Cornejo-Tenorio Centro de Investigaciones en Ecosistemas, Universidad Nacional Autónoma de México
  • Guillermo Ibarra-Manríquez Centro de Investigaciones en Ecosistemas, Universidad Nacional Autónoma de México
Keywords: diversity, endemism, floristics, temperate forests, temperate vegetation, threatened species, tropical forests, tropical vegetation

Abstract

Based on the review of floristic and taxonomic literature, as well as on the examination of specimens housed at the herbaria of the Centro Regional del Bajío (IEB) and the Instituto de Biología (MEXU), we recorded 845 species, 352 genera and 100 families of trees for the state of Michoacán, Mexico. The largest numbers of species per family were recorded for Asteraceae (82), Fabaceae (74), Mimosaceae (67), Caesalpiniaceae (39) and Burseraceae (38), while at the genus level Bursera (37), Quercus (35), Lonchocarpus (19), Senna (18), and Acacia (16) are the most speciose. The genus Beiselia (Burseraceae) and 14 species (1.8 %) are strict endemics to the state. A total of 28 families (28%) and 210 genera (60%) are represented in the state only by one tree species each. The most important vegetation types according to their species richness are tropical deciduous forest (593, 70.2%), coniferous forest (336, 39.8%) and oak forest (332, 39.3%). A high proportion (69.9%) of Michoacán’s tree species is located in 2-4 vegetation types; 173 species (21.5%) have been found just in one type, mainly in the tropical dry forest (87 species, 10.3%). The floristic richness of Michoacán is largely explained by its complex geologic history, its rugged physiography, its diverse climate, and its multiple vegetation types, as well as by its location at the confluence of the Holartic and Neotropical floristic kingdoms. Counties and species on which to focus conservation efforts for trees in the state are pinponted.
The tree flora of Michoacan, Mexico
Published
2006-06-15
Section
ARTICLES / ARTÍCULOS