Rosettes (2-)3-6 × 4-10 dm. Leaves (25-)27-50 × 3-5.5 cm; blade lanceolate; marginal teeth (2-)3-5 mm, 2-4 cm apart; apical spine stout, subulate, 2-4 cm. Scape 3.5-5 m. Inflorescences narrowly paniculate; longer lateral branches (1-)4-10 cm. Flowers 4-12 per cluster, (2.6-)2.9-4.3 cm; ovary 1.5-2.9 cm. 2n = 60. Flowering mid spring--early summer. Calcareous or sandstone outcrops in desert scrub, pinyon-juniper, or adjacent conifer woodlands; 700--2500 m; Ariz.