Plant: perennial scapose herbs; Rosettes freely suckering, open, ca. 1-2 m tall, 2-3.7 m broad Leaves: numerous, 10-20 dm long, 1.5-2.5 dm wide, lanceolate, acuminate to abrubtly acuminate, narrowed above thickened base, rigid, plane or guttered or convex, light gray glaucous to light green, sometimes with cross-zoned or variegated patterns, the margins undulate to crenate to straight; teeth regular or variable, the larger ones 5-10 mm long, the smaller ones 3-5 mm long, straight or curved, 1-6 cm apart, brown to pruinose gray, interstitial teeth absent; terminal spine 2-5 cm long, conic to subulate, shallowly grooved above, shiny brown to pruinose gray Inflorescence: with scape 5-9 m tall, open, of 15-35 long lateral horizontal branchlets in upper ½ of flowering stalk, the stalk thick, gray-green to glaucous Flowers: 70-100 mm long, long-pedicellate, fragrance unknown; tepals unequal, erect, thick, involute, pale yellow, the outer ones 25-38 mm long, thick linear-lanceolate, the apex sometimes red-tipped, the inner ones 2-3 mm shorter; filaments 60-90 mm long, inserted near mid-tube, light yellow, the anthers 30-36 mm long; ovary 30-45 mm long with constricted, grooved neck, green, the style 55-72 mm long when stigma is receptive, yellow; floral tube 8-20 mm long, 16-20 mm wide, deeply grooved, green Fruit: a loculicidal capsule, oblong to globose, 4-5 cm long, short-stipitate, short-beaked; SEEDS black, 7-8 mm long, 5-6 mm wide REFERENCES: Hodgson, Wendy. 1999. Agavaceae. Ariz. – Nev. Acad. Sci. 32(1).