Rep. (Annual) Missouri Bot. Gard. 22: 91, plates 84–86. 1912
Plants acaulescent, sparsely suckering; rosettes usually solitary, (4–)5–8 × (5–)10–15 dm, rather open. Leaves ascending, 30–60(–70) × 15–27 cm; blade glaucous-gray to gray-green, not cross-zoned, lanceolate to broadly lanceolate, rigid, adaxially concave, abaxially convex; margins straight, armed, teeth single, well defined, (5–)7–10 mm, 1.5–2 cm apart; apical spine dark brown to gray, subulate, 3–5(–10) cm. Scape 2–7 m. Inflorescences paniculate, not bulbiferous, dense; bracts persistent, lanceolate, (3–)5–10 cm; lateral branches 12–20, slightly ascending, comprising distal 1/2–2/3 of inflorescence, longer than 10 cm. Flowers 21–48 per cluster, erect, 6.8–9 cm; perianth yellow to yellow-green, tube funnelform, 14–22 × 15–22 mm, limb lobes erect, slightly unequal, 18–24 mm; stamens long-exserted; filaments inserted irregularly ca. mid perianth tube, erect, yellow, 5–6.5 cm; anthers yellow, 25–30 mm; ovary 3–4 cm, neck constricted, 2–8 mm. Capsules short-pedicellate, oblong to obovoid, 4–5.7 cm, apex beaked. Seeds 6–7 mm.
Phenology: Flowering summer–early fall.
Habitat: Gravelly to rocky, often calcareous places in grasslands, desert scrub, pinyon-juniper, and oak woodlands
Elevation: 1200–2000 m
Tex., nw Mexico.
Agave havardiana hybridizes with A. lechuguilla to form A. ×glomeruliflora, with which it may also hybridize.