Dasylirion longissimum Lem. var. longissimum Dasylirion longissimum Lem. var. longissimum in Ill. Hort. 3: misc. 91. 1856 sec. Bogler 1998=Dasylirion juncifolium Rehnelt in Gartenwelt 11: 77. 1906 syn. sec. Espejo-Serna & López-Ferrari 2008