Splitting Echinocactus: morphological and molecular evidence support the recognition of Homalocephala as a distinct genus in the Cacteae

DOI: 10.3897/phytokeys.111.26856

Keywords: Cactaceae , Cactaceae , HEA clade, morphological character evolution, North American Deserts Plantae, Caryophyllales, Cactaceae Plantae, Caryophyllales, Cactaceae Plantae, Caryophyllales, Cactaceae

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