Klopper, Ronell Renett; Smith, G.F. (Gideon Francois), 1959-; Figueiredo, Estrela; Crouch, Neil R.
(British Cactus and Succulent Society, 2010)
The Ditepalae, an informal taxonomic grouping recognized in the genus Agave L., currently consists of 12 species, most of which geographically straddle the border between the southern USA and Mexico. All of these species ...