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lc: white centered to 70% of surface.

lc: yellow margined
ns: listed with Glasshouse Works Catalog 1990: no page number.

lc: wide yellow margins
ns: Louisiana Nur. says "Hummel's Dwarf Cornelius" is the common name. This may connect it
ns: with 'Cornelius Baja'?
li: Louisiana Nursery Catalog 1990-92 : 82

ht: 3 ft. tall x 10 ft. wide
ha: larger tha some species clones
lc: rich glaucous blue
or: from Yucca Do seed from near Victoria, Mexico
so: Plant Delights (online catalog 2003)

ht: 40 in. tall x 60 in. wide
lc: rich glaucous blue
lw: wider blade than some clones
or: seedling from Yucca Do, collected near Saltillo and Monterey, Mexico
so: Plant Delights (online catalog 2003)

ha: dwarf, compact, "semi-monstrose"
lc: "rich gold-cream banding"
li: Glasshouse Works Catalog 1990: no page number.

ls: one a single spine per blade
ch: more cold hardy
li: Louisiana Nursery Catalog 1990-92: 82.

lc: rich silvery-blue
so, in: Yucca Do Nursery (online catalog 2004)

ht: 1.5m
lc: striped creamy white
aw: RHS AGM 1994

ns: a listed name. The name would literally mean "yellow-green margined".

lc: margined yellowish-white to golden yellow. 'Striata' is not as uniform and more sparsely striped.
so: Bob Smoleys

ns: white margined, never yellowish as with the other clones.

ns: a listed name, presumably having yellow margins as does ordinary 'Marginata'. Yokoi and
ns: Hirose class it as "greenish yellow margined" while listing 'Marginata' as whitish-yellow
ns: margined.
li: Yokoi, M. and Y. Hirose. 1978. Variegated plants. Seibundo Shinkosha.

lc: yellow margined, less creamy than 'Marginata' and less green than 'Marginata Aurea'. Most
lc: distinctly yellow in new growth.
li: Yokoi, M. and Y. Hirose. 1978. Variegated plants. Seibundo Shinkosha.

lc: yellowish-white centered.
ns: Yokoi and Hirose list it separate from 'Mediopicta' in their inventory.
li: Yokoi, M. and Y. Hirose. 1978. Variegated plants. Seibundo Shinkosha.

ht: 1.5m
lc: creamy yellow to yellow striped in center of blade. The cultivar name means "middle painted".
aw: RHS AGM 1994
ns: some plants under this name are in fact 'Mediopicta Alba' which is more white in coloration.
so: Bob Smoleys

lc: creamy white to white in central band or striping. True 'Mediopicta' is clearly yellow at times.
aw: RHS AGM 1994
so: Bob Smoleys

ht: 1.0-1.4m
ha: foliage distinctly more upright
lc: more glaucous blue than species typical
so: Collector's Corner

lc: striped creamy-yellow, sparsely at times, and usually near the margins only.
so: San Marcos Growers

ht: rosettes to 50cm wide
ha: dwarf, compact, spreading and open rosettes
lc: yellow margined to 50% of width
lm: more undulate than species typical
so: Collector's Corner

lc: banded white. Sounds similar to 'Marginata' which is an accepted name of long standing.

lc: white margins on a blue-green base color.

lc: margined, striped, and blotches white.
li: Louisiana Nursery Catalog 1990-92: 82

ht: 3-4 ft. tall x 5 ft. wide
ha, lw, nfl, lc: as 'Nova' but bluer still
or, so, in: www.smgrowers.com (online catalog 2007), their own named selection from 'Nova'

lc: golden yellow margines on silvery-blue base color.
li: Louisiana Nursery Catalog 1990-92: 82

ht: 3-4 ft. tall x 3-4 ft. wide
lc: rich bluish-gray - bluer than species typical
lw: wider than species typical
id: San Marcos Growers list it separately in 2005 but suspect it may be the same as 'Nova'
or: Huntington Bot. Gardens (?)
so: smgrowers.com (online catalog 2005)

ht: 4-5 ft.
lw: wider blade than species typical
lc: more glaucous blue than species typical
infl: erect - not drooping as most species variants.
or: collected in Sierra de Manantlan at 7200 ft.
so: San Marcos Growers

ns: a listed name for a dwarf variant. Apparently an invalid name in use only after 1959.

ht: rosettes each 3 ft. tall x 2-3 ft. wide, forming larger clumps
ha: leaves sinuous, distinctly flame-shaped, a very elegant and appealing aspect
lc: waxy greenish-blue
lm: finely serrate - not nearly so spinose as other blue cultivars
or: David Verity as hybrid, early 1960's. This was once reported the first known subgeneric cross, involving Subg. Agave and Subg. Littaea. That distinction appears
or: now to belong to the cultivar 'Shark Skin' (see below).
so: smgrowers.com (online catalog 2005)

ht: 2 ft. tall x 3 ft. wide
lc: apple green
ch: USDA 8a
or: collected at 9000 ft. on Sierra Madeo Orientale, Mexico
so, in: Yucca Do Nursery (online catalog 2004)

ht: 18 in. tall x 2.5 ft. wide
lc: waxy bluish-green, very broadly margined (1-2 inches wide) in light yellow, chimera eaisly 50% of blade
ns, id: this plant goes under many names since the late 80's. It is likely not from A. americana as widely labeled. A reversion of this plant produced a smallish, blue-green
ns, id: plant quite unlike that species overall. The name 'Hummel's Dwarf Cornelius' listed by Louisiana Nursery (see entry under A. americana above) has a ring of
ns, id: familiarity to it. Hummel selected many variegated succulents in CA in the last half century and often used 3 word epithets for this products.
so: Plant Delights (2006 Spring Sales Catalog: 13, with color photo). Their stock is from Berkeley Bot. Gard.

ht: 2 ft. tall x 3 ft. wide
lc: greyish-green striped in white
id: is has an affinity to A. desmettiana but a clear association is not possible without flowers.
so: smgrowers.com (online catalog 2005)

lc: green-green with densely set, very showy dark red spines. Almost looks red margined from
lc: some distance.
ns: named for the famous breeding and collector of succulents.

ns: listed name with the RHS PLANT FINDER 1999.

ht: 24 in. tall x 48 in. wide
lc: glossy dark green with paler markings and sections
lm: very wide sinuses between larger than normal spinose teeth
ch: USDA 7B
so: Plant Delights (2006 Spring Sales CataLog: 13, with color photo)
or: Yucca Do Nurseries, obtained at 8000 ft. in Nuevo Leon Prov. of Mexico

ha: miniature
lc: dark green
li: Louisiana Nursery Catalog 1990-92: 82

lc: blue-grey, centered more green with distinct red spines
lw: blades short and wide by genus standards
web: tarrex.com.au

ha: compact, dwarf
lc: whitish-grey blades
so: Glasshouse Work

ht: 60 in. tall x 60 in. wide (one rosette)
ha: clump-forming
lc: rich bluish-green, appearing fairly dark green overall compared to other taxa
lm: very undulate wtih numerous spinose teeth
ch: USDA 8
so: Plant Delights (2006 Spring Sales Catalog: 13, with color photo)
or: Yucca Do Nurseries, obtained from Ciudad de Maize, San Luis Potosi, Mexico in 2001, probably a hybrid of A. salmiana

ht: 3-5 ft. tall x 4-6 ft. wide
lc: dark greyish-green, teeth well imprinted on leaves so as to resemble frosted Baccarat (or any other) brand of Crystal, marginal spinose teeth dark brown and saw-like
ch: 0 deg. F.
ns: if Baccarat crystal is a trademarked product or companyt (this remains unclear but quite likely), this cultivar name would be invalid without trademark holder permission.
or: Wade Rotsch, Yucca Do Nursery 1997, collected near La Encanteda, Mexico at 9000 ft.
so: www.smgrowers.com (online catalog 2006, with photo)

ht: 3 ft. tall x 5-6 ft. wide
ha: artichoke-like in appearance
lc: greyish-green
lm: large spinose teeth
or: collected at 9000 ft. in N.E. Mexico
so, in: Yucca Do Nursery (online catalog 2004)

lc: central band of cream-ochre
li: Glasshouse Works Catalog 1990: no page number.

ns: a listed name for more blue selection.

ha: crested, fasciated variant.

ha: small, neat, dense rosette
lc: margined cream at 15-20% of blade width
ns: the Latin names for this are post-1959 and not useable. John Trager suggested this name to San Marcos and was first used by them.
so: www.smgrowers.com (online catalog 2007)

ns: a listed name for a Japanese clone.

so: Bob Smoleys

so: Bob Smoleys

ht: rosettes 10cm wide
ha: dwarf, clustering well.

ht: 48 in. tall and wide in foliage
lc: dark green, sometimes bluish at the leaf base at first - not so glaucous and blue as variety typical
so: Plant Delights (2006 Fall Sales Catalog: 7, with color photo)
in, or: Yucca Do Nursery T43-29 from near the Sierra Chiquita Mts., Mexico as a notably green, less glaucous plant in the wild population. Introduced by them about 2005.

ht: 36 in. (in leaf) becoming 15' in flower.
lc: powdery blue
ch: 7
ns: may be subsp. maderensis
so: Plant Delights (2002 Spring Catalog: 12, with photo)

ht: 2 ft. tall x 2-4 ft. in foliage becoming 10-12 ft. in flower
ha: symmetrical rosette with leaves much straighter than species typical. Produces about
ha: 100-150 leaves in 10 years.
lc: dark green with white markins and white marginal fibers
ll: 1.0-1.5 ft.
lw: 1 in.
la: very sharply spinose at the apex.
fc: dark purple
infl: dense inflorescence
tm: cultivar name is trademarked by Starr Nursery
so: Starr Nursery (online catalog 2001)

lc: bluish-grey, rough, resembling the texture of familiar shark skins

ht: 48 in. x 70 in. wide
lc: light blue-green fading near white with age
lw: 1 in. wide
ll: to 36 in.
ch: 7
or: collected from Monclova, Coahuila, Mexico.
so: Plant Delights (2002 Spring Catalog: 12, with photo)

ha: dwarf, compact, clustering, often becoming mounded to globose.
lc: blue-green
so: Bob Smoleys

lc: red tints in sun or strong light
so: Glasshouse Works

ht: 20cm
ha: low, spreading and open rosettes
lc: reddish-green with more green central zone or stripe.

ha: miniature, compact
lc: lightly variegated down the center of blades.
so: Bob Smoleys

ha: miniature, 4 inch wide, offsetting well once established.
ll: 2 in. wide and long

ha: dwarf with thicker and heavier leaves.
so: Glasshouse Works

lc: yellow margined
so: Glasshouse Works

ht: 15cm tall, generally under 5-6 in. wide
ha: compact with more numerous small rosettes. It offsets fairly well and thus is widely known.
ll: 2 in. long or less
lc: very highly margined and striped white compared to species typical
so: Bob Smoleys

lc: highly variegated yellow to gold, by one photo about 50% margined golden-yellow.
ns, id: there are several golden margined variants, some more colorful than others. These needs to be sorted out.

ha: smaller, highly clustering
lc: more highly marked white, showy
so: Bob Smoleys

lc: yellow margined

ha: dwarf, clumping
lc; more highly marked with tan and white margins.
so: Glasshouse Works

lc: yellow margined

lc: yellow variegated in some manner.
so: Bob Smoleys

ha: crested, especially near the meristem, having swirled leaves
lc: blue-green

lc: margined bright creamy yellow
li: Glasshouse Works Catalog 1990: no page number.

lc: silvery-green
li: Louisiana Nursery Catalog 1990-92: 82 (listed separate from species).