Vegetación y flora vascular del ejido Llano de Ojo de Agua, Depresión del Balsas, municipio de Churumuco, Michoacán, México

Abstract

ResumenDerivado del trabajo de campo realizado entre 2012 y 2016, se describen los 2 tipos de bosque tropical (caducifolio y subcaducifolio) y la flora vascular del ejido Llano de Ojo de Agua, ubicado en la Depresión del Balsas (Michoacán). Se registraron 466 especies (2 subespecies), que representan 303 géneros y 84 familias. Fabaceae (83 especies), Euphorbiaceae (34) y Asteraceae (32) destacaron por su riqueza, mientras que en la categoría de género, lo fueron Bursera, Ipomoea (cada uno con 14 especies) y Euphorbia (13). El endemismo de la flora a escala del país fue de 41.1% (192 especies), 4.1% (19) para la Depresión del Balsas, con 7 especies restringidas a Michoacán. Las hierbas fueron la forma de crecimiento más frecuente (216 especies, 46.3%), seguidas por los árboles (155, 33.2%). Un total de 98 especies se encuentran asignadas bajo alguna categoría de riesgo. Se confirma la importancia florística de la Depresión del Balsas y la pertinencia de continuar con su inventario en áreas poco exploradas.

Plant community attributes of a tropical dry forest physiognomically dominated by Heteroflorum sclerocarpum (Fabaceae)

“…The geology is dominated by rocks from the Mesozoic (e.g., andesite) and Cenozoic (e.g., acid tuff), and the most abundant soil type is Leptosol (51.7 %) followed by Phaeozem (32.4 %) (CONANP 2014). The prevailing climate is dry, tropical, with summer rains (BS 0 ); during period from 1981 to 2010 the mean values of minimum and maximum temperature were 17.7 and 46 °C, respectively, with a mean annual rainfall of 564 mm (June-October), and a long dry season between November and May (Luna-Nieves et al 2017, Ibarra-Manríquez et al 2021. Two types of vegetation have been described in the area -TDF and tropical subdeciduous forest -in which 466 species were recorded from 84 families (Ibarra-Manríquez et al 2021).…”

“…The prevailing climate is dry, tropical, with summer rains (BS 0 ); during period from 1981 to 2010 the mean values of minimum and maximum temperature were 17.7 and 46 °C, respectively, with a mean annual rainfall of 564 mm (June-October), and a long dry season between November and May (Luna-Nieves et al 2017, Ibarra-Manríquez et al 2021. Two types of vegetation have been described in the area -TDF and tropical subdeciduous forest -in which 466 species were recorded from 84 families (Ibarra-Manríquez et al 2021). Fabaceae, Euphorbiaceae, and Asteraceae families were the richest, with 83, 43, and 32 species, respectively.…”

“…The ejido is a land tenure regime, where people take collective decisions on the land managements; Churumuco county people live in extreme poverty, with few basic services and the opportunities of jobs are scarce (INEGI 2010), and poorly paid. The main economic activities are the crop fields and land pastures, mainly for cattle raising (Ibarra-Manríquez et al 2021).…”

A Synopsis of Croton (Euphorbiaceae) in Michoacán, Mexico

“…Croton rojasii is named in honor of Misael Rojas López, a naturalist from the community of Llano de Ojo de Agua, municipio de Churumuco, Michoacán. It is in recognition of his significant contributions to the biota of this area, including the co-authorship of a floristic checklist of the region [27]. He also collected the type specimen.…”

“…Reproductive material is needed to determine its identity: mpio. La Huacana, El Lindero, Rancho Las Pilas, fondo de cañada, 27 Webster [8] characterized C. roxanae as having glabrous staminate pedicels and sepals, but some of our plants, otherwise appearing to belong to the taxon and without observable differences, have stellate-pubescent staminate pedicels and sepals, e.g., Y. Ramírez-Amezcua and V.W. Steinmann 1393. distinguished from C. pedicellatus by a shorter, abruptly recurved pedicel.…”