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

• Agave americana L.: Solitary or slowly clumping grey-blue rosette up to 4 m wide up to 150-200 cm tall. The leaves are often refexed above the middle. Cultivated worldwide with several different variety.
• Agave americana f. aureo-marginata hort.: Variegated cultivar with yellow stripes along the margins of each leaf.
• Agave americana var. expansa (Jacobi) Gentry: has a short trunk up to 60 cm tall with grey-glaucous cross zoned leaves.
• Agave americana f. medio-picta alba: Variegated cultivar with a broad white band down the centre of each leaf.
• Agave americana var. oaxacensis Gentry: Has very large glaucous-white leaves with nearly straight margins. Leaves never reflexed. Cultivated form mainly in Oaxaca Valley.
• Agave americana var. picta (Salm-Dyck) A.Terracc.: The name "picta" has been variously used to indicate a number of varieties, segregated largely on the basis of the yellow or whitish striations. This variegated forms are inconstant in their colour patterns.
• Agave americana subs. protamericana Gentry: Regarded as the wild progenitor of the cultivated Agave americana differs in its greater variability in form, spination and colour of the leaves which generally are shorter, compact and wider.
• Agave americana subs. protamericana cv. Blue Steel: has beautiful steel-blue, tight, upright, leaves with wider blade than some clones.
• Agave americana var. striata Trel. in L.H.Bailey: Variegated cultivar with multiple yellow to white stripes along the leaves.
• Agave cv. Cornelius: small monstrous and strongly variegated form with gorgeous wide creamy-yellow margins on blue-green undulating spidery foliage.