With the uplift of the Sierra Madre Occidental in the late Oligocene-early Miocene, tropical deciduous forest was isolated in northwestern Mexico. Thornscrub and then the Sonoran Desert formed during a drying trend in the middle Miocene. The opening of the Gulf of California at the same time…

The Sierra Bacha is in the Central Gulf Coast Subdivision of the Sonoran Desert along the coast of the Gulf of California, south of Puerto Libertad, Municipality of Pitiquito, Sonora. The flora of the Sierra Bacha has 269 species, one additional subspecies, and one hybrid in 57 families and 183…

Does not include the far northwest or lower portions of the watershed from Tucson area and to the north. Zoom in all of the way to see all features and names. Springs locations included from a unknown springs dataset.

To zoom properly, click on the map to get the image only, then click on…

It took me a bit of effort to find this info, so I figured I'd share it here. Conagua seems to regularly change where they report these data, so until these links stop working, here is how to find the recent flow data (gastos) for some of Sonora's rivers. These Boletins appear to come out…

In recent years, amphibians and reptiles have been observed in Sonora, Mexico, on Madrean Discovery Expeditions (MDE) to Sky Island mountain ranges, MDE wildlife camera studies, MDE student herpetological inventories, and personal field trips. Additional observations are from iNaturalist, the…

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),…