Abstract
Johnston, Marshall C. (U. Texas, Austin.) The species o Ziziphus indigenous to United States and Mexico. Amer. Jour. Bot. 50(10): 1020–1027. Illus. 1963.—Taxonomic treatment is presented for the 7 species of Ziziphus P. Mill. (Rhamnaceae: Dicotyledoneae) recognized in United States and Mexico, with key, synonymies, descriptions, and distribution maps. The taxon Condaliopsis is restored to Ziziphus after having been treated as a subgenus of Condalia Cav. for more than 60 years on the basis of superficial vegetative characters. The name Z. sonorensis S. Wats. for the widespread Mexican species is replaced by the prior Z. amole (Sessé & Moçiño) comb. nov. The genus Sarcomphalus P. Br. is referred to Ziziphus, the type species becoming Z. sarcomphalus (L.) comb. nov. Some fossil remains attributed to this genus are mentioned, but phyletic speculations arc advisedly postponed until the whole genus and related genera can be reviewed.
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