We report 431 taxa in 269 genera and 69 families for the Tónichi area. The most diverse families are Fabaceae (61 taxa); Poaceae (40 taxa); Asteraceae (36 taxa); Euphorbiaceae (27 species); Malvaceae (22 species); Convolvulaceae (20 species…

The northeastern corner of Sonora, Mexico, is lightly populated and contains some spectacular natural landscapes. Among its gems is Sierra El Tigre, a large and high mountain range surrounded on three sides by the Río Bavispe. The range is part of the Sky Islands, also known as the Madrean…

The Sierra La Púrica is a Sky Island mountain range north- northwest of Nacozari de García (municipality of the same name), Sonora, Mexico, in the Área de Protección de Flora y Fauna Bavispe in the Comisión Nacional de Áreas Naturales Protegidas. The Madrean Archipelago Biodiversity Assessment…

The trans-border flora of the San Bernardino National Wildlife Refuge in Arizona and Rancho San Bernardino in Sonora has 541 taxa in 316 genera and 86 families. The most diverse families are Poaceae (88 taxa), Asteraceae (84 taxa), Fabaceae (28 species), …

The Municipality of Huatabampo is located along the coast of the Gulf of California in southern Sonora, Mexico. The vegetation is coastal thornscrub, the more xeric version of tropical deciduous forest. In 1890, Edward Palmer collected plants at Agiabampo in the municipality. In the late 1980s…