A new and narrowly endemic species from the Tehuantepec District of Oaxaca, Ipomoea tehuantepecensis L. Torres Colín, R. Torres Colín, M.P. Ramírez & J.A. McDonald, is described and illustrated. The new species belongs to a primitive assemblage of hairyseeded lianas…

Mousonnia adpressipilosa D. L Denham ex Ramirez-Roa (Gesneriaceae), a new solitary-flowered species from southern Mexico and Guatemala. is described and illustrated. It has been collected principally in Chiapas, Mexico, with only one location in the Sierra de los Cuchumatenes, Guatemala.…

Aim: The purpose of the study was to assess the degree of floristic differentiation between tropical dry forest (TDF) and savanna occurring in a single landscape. This comparison provides information on the responses of vegetation to the prevailing environmental conditions,…

Aim The purpose of this study was to examine the biogeographical relationships of the tree flora of the Yucatan Peninsula (YP2). To this aim we: (1) evaluated the affinities of political entities of tropical America with the Yucatan Peninsula, considering…

Knowledge of the population dynamics of tropical trees has expanded considerably in the past 20 years. An important observation deriving from these investigations is the confirmation that population behaviour varies both in time and space. A tool recently developed to…

Two new species of the spider genus Ochyrocera Simon 1891 are described from Mexico. Ochyrocera juquila new species was collected under moist rotten logs and hollow trunks on a thick bed of pine needles in oakpine forests located in a…