Agave asperrima var. asperrima

Plants acaulescent, frequently suckering; rosettes not cespitose, 7-10 × 15-20 dm. Leaves spreading to recurved and mostly reflexed, 60-110 × 12-18 cm; blade light green to grayish, without bud-prints, lanceolate, scabrous, rigid, adaxially plane and deeply guttered from mid blade to base, abaxially convex; margins straight, toothed, teeth single, usually deflexed along lower leaf edge, 8-15 mm, 1 cm apart; apical spine dark brown to blackish, subulate to acicular, 3-6 cm. Scape 4-7 m. Inflorescences paniculate, not bulbiferous; bracts persistent, triangular, 3-10 cm; lateral branches 8-14, slightly ascending, comprising distal 1/3 of inflorescence, longer than 10 cm. Flowers 14-18 per cluster, erect, 6-8 cm; perianth yellow, tube cylindric, 13-18 × 14-16 mm, limb lobes erect, subequal, 18-26 mm; stamens long-exserted; filaments inserted just above mid perianth tube, erect, yellow, 5-6.5 cm; anthers yellow, 24-30 mm; ovary 3-4 cm, neck constricted, 4-6 mm. Capsules short-pedicellate, oblong, 4-5 cm, apex beaked. Seeds 6-7 mm. 2n = 174.

Flowering late spring--summer. Sandy to gravelly, often calcareous places in desert scrub; 500--1500(--1900) m; Tex.; n Mexico.

M. S. Cave (1964) reported chromosome counts of n = 74-93; H. S. Gentry (1982) stated that only one of Cave´s counts applied to var. asperrima and he gave it as n = 87.