Subspecies, varieties, forms and cultivars of plants belonging to the Agave univittata group

• Agave lophantha var. pallida A.Berger: rosette 25—30-leaved, 50 to 55 cm in diameter. Leaves to 50 cm long, and 25 mm wide, pale green, darker towards the margins, margins with narrow, detaching horny lines, spines hooked, 2.5-5 cm apart, 8-10 mm long.
• Agave lophantha var. poselgeri (Salm-Dyck) A.Berger: has a free suckering habit and occurs in a variety of forms. Leaves only 20-26 cm long, 16—18 mm wide, sinuous, with a long, fine terminal spine, spines small, distant, absent in the upper part. Distribution: Mexico: Plateau near El Paso; Texas.
• Agave univittata Haw.: stemless, 30-60 cm tall, 50–100 cm wide, usually forming offsets. Leaves light green, with or without pale mid-stripe, marginal spines stout, curved downwards, terminal spine 25 mm long. It is extremely variable. Distribution: USA (Texas), Mexico (Coahuila, Nuevo Leon, Tamaulipas, San Luis Potosi, Veracruz, Puebla)
• Agave univittata var. angustifolia (A.Berger) H.Jacobsen: (Variegated form) Leaves not numerous, 75 cm long, 2.5 c. wide, terminal spine slender, leaf dark green on the upper side, more grey-green on the reverse, with numerous darker cross-lines, marginal spines small, 2—7 cm distant.
• Agave univittata var. brevifolia (Jacobi) H.Jacobsen: Leaves 32—33 cm long, 5 cm wide at the base, 3.5 cm wide above the centre, gradually tapering towards the tip, ending in a blunt tip, leaf colour without green longitudinal lines.
• Agave univittata var. coerulescens (Salm-Dyck) H.Jacobsen: Similar to the species; Leaves somewhat shorter and more numerous, rough, light blue-grey, without pale band, spines rather stout, directed downward.
• Agave univittata var. gracilior (Jacobi) H.Jacobsen: Rosette very regular. Leaves more numerous, slender, more narrow, leaf margins more light grey, spines much closer and with browned tip.
• Agave univittata var. latifolia (A.Berger) Breitung: has larger, very dense-leaved rosettes 130—150 cm in diameter, 75—100 cm high, forming offsets. Leaves sword-shaped, 73-76 cm long, below 5.5 cm, at the centre 6 cm wide.
• Agave univittata var. lophantha (Schiede ex Kunth) Maire & Weiller: Same as Agave univittata, and the two plants are not readily distinguishable.
• Agave univittata var. lophantha f. quadricolor: Solitary or slowly clumping succulent rosette, up to 40 cm tall, 60 cm in diameter. Leaves variegated with four distinct colours.
• Agave univittata var. subcanescens (Jacobi) H.Jacobsen: Leaf margins and marginal spines almost white, leaf colour grey-green.
• Agave univittata var. tamaulipasana (A.Berger): Leaves 30-40 cm long, 25—35 mm wide, terminal spine conical, margins with a fine horny edge, marginal spines 15-20 mm apart, 3—7 mm. Distribution: Mexico, Taumalipas.