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A novel species of Perymenium from Sonora, Mexico is described. It appears to be closest to P. nesomii from southwestern Chihuahua, with which it is compared. A map showing distribution of the two taxa is provided.
The nomenclature of the high Andean genera Pycnophyllopsis Skottsb. and Pycnophyllum J. Rémy is examined. Eight species of Pycnophyllopsis are recognized; lectotypes or neotypes are selected when required; a new species, Pycnophyllopsis smithii is proposed and two new combinations are made. The genus Plettkea Mattf. is reduced to a synonym of Pycnophyllopsis. Ten species of Pycnophyllum are accepted, including a new species, Pycnophyllum huascaranum and lectotypes or neotypes are selected when needed.
The Sierra Mazateca is located in the northern mountainous region of Oaxaca, Mexico, between the Valley of Tehuacán-Cuicatlán and the Gulf Coastal Plains of Veracruz. It is part of the more extensive Sierra Madre de Oaxaca, a priority region for biological research and conservation efforts because of its high levels of biodiversity. A floristic study was conducted in the highlands of the Sierra Mazateca (at altitudes of ca. 1,000–2,750 m) between September 1999 and April 2002, with the objective of producing an inventory of the vascular plants found in this region. Cloud forests are the predominant vegetation type in the highland areas, but due to widespread changes in land use, these are found in different levels of succession. This contribution presents a general description of the sampled area and a checklist of the vascular flora collected during this study that includes 648 species distributed among 136 families and 389 genera. The five most species-rich angiosperm families found in the region are: Asteraceae, Orchidaceae, Rubiaceae, Melastomataceae, and Piperaceae, while the largest fern family is Polypodiaceae.
Lee County is located in the Post Oak Savannah and Blackland Prairie vegetation areas of east-central Texas and encompasses 635 square miles (ca. 405,000 acres). A floristic survey of the vascular plants of Lee County, Texas, was conducted from November 2002 through March 2006 as a requirement for the Master's Degree by the author in the Plant Biology Graduate Program at The University of Texas at Austin. The county was revisited in the summers of 2015 and 2017 to update information for publication. The physical and biotic settings, vegetational history, and previous collecting efforts are outlined. The checklist contains voucher collections from the present study as well as additional records from the TEX/LL, TAES, TAMU and BAYLU herbaria. The annotated checklist includes 732 species and infraspecific taxa, representing 427 genera and 122 families. The most species-rich families are Asteraceae, Poaceae, Fabaceae, Cyperaceae, and Euphorbiaceae. No federally or state listed rare species were documented, although at least two species of conservation concern were collected within the county. Native species comprise about 89% of the county flora, and include 20 species endemic to Texas. The phytogeographic position of Lee County is discussed, with a prominent feature being its position at the extreme western edge of the distributions of many species typical of the southeastern U. S. flora.