The historical reconstruction of solar activity is a task of great interest for geophysicists and solar physicists. Historical sunspot observations are a fundamental tool for this task. In this short contribution, we present some historical sunspot observations in Mexico.

Hechtia lepidophylla is described and illustrated. A complete description including characters of staminate, pistillate, and fruiting plants is included, with details of growth pattern and ecological characteristics, as well as characters to distinguish it from species with similar vegetative and…

Tillandsia magnispica Espejo & López-Ferrari, known only from the state of Oaxaca, Mexico, in the municipalities of San Pedro el Alto and San Pedro Pochutla, is described and illustrated. The new taxon is compared with T. jaliscomonticola Matuda, a morphologically…

The name Didymaea alsinoides (Schltdl. & Cham.) Standl. has been incorrectly applied to a common and wide-ranging Mexican and Central American species whose correct identity is Didymaea Mexicana Hook. f. In this paper a lectotype is selected and designated for…

This article analyzes the progress obtained in diminishing poverty and inequality in Mexico during the post-NAFTA years ranging from 1994 to 2007, and how it pertains to the broad critical debate surrounding poverty-gap reduction in the context of regional and…

Cypringlea (Cyperaceae), a Mexican endemic genus segregated from Scirpus, includes three species. Cypringlea evadens, previously treated as a variety or under synonymy of C. analecta, is raised here to the specific level. It differs in the degree of inflorescence compounding,…

Fuirena repens was known for many years only from the Mexican state of San Luis Potosí, where it is documented by a few historical specimens. Recent field and herbarium studies have revealed two additional stations for this species in the…

Sedum chazaroi (Crassulaceae), an endemic new species from southern Jalisco, Mexico, is described and illustrated. This taxon belongs to section Sedastrum (Rose) Berger based on characters such as its basal rosettes, dense pubescence and paniculate inflorescences. Among differentiating characters from…

We describe ammonites from a newly discovered, fossil-bearing, marine Liassic locality (Lower Jurassic, Huayacocotla Fm.) in the vicinity of the Zongozotla Municipality (southern Sierra Madre Oriental) in the northern part of Puebla State (Mexico). The fossiliferous strata are about 1…

The holotype of the first sauropterygian described from Mexico, Plesiosaurus mexicanus Wieland, 1910, was recently rediscovered and is here described and discussed for the first time in almost a century. The holotype specimen belongs to an indeterminate metriorhynchine crocodyliform. Doubts…