The small genus Cercocarpus (Rosaceae), of western North America, consists of two species (according to the most conservative estimate possible), or as many as 21 species (according to Rydberg, N. Am. Fl. 22: 418-424. 1913)….In Texas the genus Cercocarpus is found in three principal areas, namely in the Panhandle, in the Edwards Plateau, and in the trans-Pecos region. In all these areas the plants occur at widely scattered localities, usually in canyons or ravines or on isolated mountain ranges, and often separated by scores or even hundreds of miles from other localities where the same species occurs.
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"Remarks on the Genus Cercocarpus in Texas,"
Field and Laboratory: Vol. 20
Available at: https://scholar.smu.edu/fieldandlab/vol20/iss1/12