Plectocephalus rothrockii

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Plectocephalus rothrockii closely resembles P. americanus. Although the ranges of the two taxa approach each other in southeastern Arizona and adjacent Chihuahua, they are locally allopatric, separated by habitat differences, and are not known to grow together. Plectocephalus americanus is a species of grassland habitats of the southern Great Plains; P. rothrockii is largely restricted to moister canyon sites in the Sierra Madre Occidental of Mexico and associated ranges of the American southwest. Mexican basketflower is sometimes cultivated, and can be expected to occur outside its native range.