=A. a. frutescens= (shrubby). Dwarfer. _l._ often loose, and shorter, intensely glaucous; peduncle simple. Stem slender, sometimes racemosed.
=A. aristata= (awned). _fl._, perianth red, fourteen to sixteen lines long; raceme simple, loose, 4in. to 6in. long, and about 4in. broad; pedicels sub-patent, thirteen to eighteen lines long; scape simple, 1ft. _l._ about fifty in a dense rosette, ascending, lanceolate, 3in. to 4in. long, six to eight lines broad, without spots or lines; face flat, sparingly tubercled; middle one and a half lines thick; back copiously tubercled; apex bearded with a pellucid awn; marginal teeth diffuse, white, half line long. 1824.
=A. Bainesii= (Baines').* _fl._, perianth fifteen to sixteen lines long, yellowish red; raceme simple, dense, oblong, 3-1/2in. to 4in. in diameter when expanded; pedicels thick, two to three lines long; peduncles upright, strong, eight to nine lines in diameter. _l._ closely packed at the top of the branch, ensiform, 1ft. to 1-1/2ft. long, 2in. to 3in. in diameter, green, spotted, deeply channelled, recurved; middle two to three lines thick; marginal prickles pale, rather distant, one to one and a half lines long. Arborescent, branched. _h._ 40ft. to 60ft.; trunk 4ft. to 5ft. in diameter. SYNS. _A. Barberæ_, _A. Zeyheri_.
=A. barbadensis= (Barbadoes). Synonymous with _A. vera_.
=A. Barberæ= (Barber's). Synonymous with _A. Bainesii_.
=A. brevifolia= (short-leaved).* _fl._, perianth red, fifteen to eighteen lines long; raceme dense, 6in. long, 2-1/2in. to 3in. in diameter; pedicels upright, six to twelve lines long; peduncles simple, hardly 1ft. long. _l._ thirty to forty in a dense rosette, lanceolate, 3in. to 4in. long, and 1in. broad at the base, glaucous, without spots or lines; face unarmed, below swollen or flat; middle three to four lines thick; back convex, sparingly tubercled; marginal teeth whitish, one to one and a half lines long. Stem short, simple. SYN. _A. prolifera_.
=A. b. depressa= (depressed). _fl._ somewhat larger; peduncles 1-1/2ft. to 2ft. long. _l._ 6in. long; bottom 1-1/2in. to 2in. broad; face sometimes sparingly tubercled.
=A. cæsia= (bluish-grey).* _fl._, perianth red, fifteen to sixteen lines long; racemes dense, nearly 1ft. long, 2in. to 3in. in diameter; pedicels twelve to fifteen lines long; scape simple, 6in. _l._ rather dense, lanceolate acuminate, 1ft. to 1-1/2ft.; bottom 2in. to 3in. broad, intensely glaucous, without spot or lines, slightly channelled upwards; middle 3in. to 4in. thick; marginal prickles red, one to one and a half lines long. Stem simple, finally, in old specimens, 12ft. to 14ft. 1815.