Purshia mexicana (D. Don) S.L. Welsh Purshia mexicana (D. Don) S.L. Welsh in Great Basin Naturalist 46(2): 260. 1986 sec. Villaseñor 2016≡Cowania mexicana D. Don in Trans. Linn. Soc. London 14(3): 575, pl. 22, f. 1-6. 1825 syn. sec. Govaerts 2013