Locality: Salero Ranch is a gated cattle ranch and rural subdivision comprising 16,000 acres in central Santa Cruz County, Arizona. (31.567420, -110.881920)
Abstract: This checklists details the vascular flora of the Salero Ranch for the Plant Atlas Project of Arizona (PAPAZ). As of September 2019, the flora includes 783 species and infraspecific taxa in 442 genera and 103 families. Significant records include an undescribed Polystemma species (Apocynaceae) that is new for the U.S.; Solanum houstonii (Solanaceae), also new for the U.S.; and Sida glabra (Malvaceae), new for Arizona and the western U.S. Dominant families are Asteraceae (128 taxa), Poaceae (114 taxa), and Fabaceae (72 taxa). Non-natives total 71 species (9% of total species), including two species native to Arizona but considered introduced to the study area: Senna covesii and Larrea tridentata. The Salero Ranch is located south of the Santa Rita Mountains and north of Sonoita Creek State Natural Area. It includes parts of the Grosvenor Hills and southern foothills of the Santa Rita Mts. The dominant vegetative community is scrub grassland, with encinal (Madrean or evergreen oak woodland) at the higher elevations in the Santa Rita foothills and Grosvenor Hills. The study area ranges in elevation from 3773 feet in the southwest corner of the ranch to 6344 feet near the northeast corner (a difference of 2571 feet). The terrain is rocky, fractured, and faulted and contains many microhabitats; water sources include seasonal drainages, cattle ponds, and natural springs.