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A study of the diversity of legumes in the northern part of the state of Nuevo León was undertaken. 38 genera, 94 species and 26 infraspecific taxa of legumes were recorded. The family Fabaceae comprises 18 genera and 42 species, Mimosaceae 10 and 30 and Caesalpiniaceae 10 and 22 respectivelly. The genera with highest number of species are Acacia (12), Dalea (10), Mimosa (6), Senna (5), Caesalpinia (4) and Bauhinia (4). Shrubby legumes are the most abundant in the zone, representing 47% (46 species); the herbaceous ones constitute 46% (45) and the arboreal ones comprise 7% (7). The highest number of taxa was recorded on semithorn shrubland (52) piedmont scrub (48), oak-pine forest (44), while the mezquite shrublands shelter the lowest number of species (23). [ABSTRACT FROM AUTHOR]

A review is made of the endemic plants following the Megacoahuila concept, that increases the state area for more than 100%. The region has climatic and physiographic variation that leads to the development of at least 13 main vegetation types, the desert shrubland being the dominant one. A total of 350 species and infraspecific taxa are listed, representing 11.2% of the total flora. The desert shrubland (matorrales micrófilo y rosetófilo) is the vegetation with the highest endemism and the Cuatro Cienegas basin the richest locality. The areas with highest endemism are suggested to be considered biotic reserves. [ABSTRACT FROM AUTHOR]

Ipomoea rzedowskii is described as a new species to science, from the Mexican states of Guanajuato, Hidalgo and Querétaro. This white flowered shrub grows in xerophilous shrublands on steep slopes east of Xichú and in the canyons of Estórax, Moctezuma and Tolimán rivers. This new taxon belongs to the series Arborescentes. [ABSTRACT FROM AUTHOR]