=A. macilenta= (thin). A mere form of _A. humilis_.
=A. macracantha= (long-spined). _fl._ unknown. _l._ fifteen to twenty in a dense rosette, lanceolate, 15in. to 20in. long, and 3in. to 4in. broad at the bottom, slightly narrowed from middle to apex; middle four lines thick; face flat, green, obscurely lined, spotted; marginal prickles horny, three to four lines long. Stem simple, 2ft. to 3ft., 1-1/2in. to 2in. in diameter. South Africa, 1862.
=A. macrocarpa= (large-fruited).* _fl._, perianth club-shaped, brilliant red, fifteen to sixteen lines long; raceme loose, terminal, 6in. long, and 2-1/2in. to 3in. in diameter; lower pedicels 1/2in. long; peduncles 2ft. _l._ twelve to twenty in a dense rosette, ovate-lanceolate, less than 1ft. long; bottom 3in. to 4in. broad; top channelled; middle three to four lines thick, green, copiously spotted; marginal prickles spreading, half line long. Stem short, simple. Abyssinia, 1870.
=A. maculata= (spotted). Synonymous with _A. abyssinica_.
=A. margaritifera= (pearl-bearing). _See_ =Haworthia margaritifera=.
=A. mitræformis= (mitre-shaped).* _fl._, perianth brilliant red, eighteen to twenty-one lines long; raceme dense, corymbose, 4in. to 6in. long, and nearly as much in diameter; pedicels ascending; lower ones fifteen to eighteen lines long; peduncles strong, 1-1/2ft., sometimes branched. _l._ rather loosely disposed, ascending, lanceolate, about 1ft. long, 2in. to 3in. broad; green, slightly glaucous, without spots or lines; face concave; middle three to four lines thick; back convex, sparingly tubercled; apex horny, pungent; marginal prickles rather close, pale, one to one and a half lines long. Stem finally 3ft. to 4ft., simple, 1in. to 2in. in diameter.
=A. m. flavispina= (yellow-spined). Differs from the type in having narrower and more lanceolate leaves, and yellow spines. _A. Commelyni_, _A. spinulosa_, _A. pachyphylla_, and _A. xanthacantha_, are also forms of this species.
=A. myriacantha= (many-spined). _fl._, perianth pale red, eight to nine lines long; racemes densely capitate, 2in. in diameter; pedicels four to six lines long; peduncles slender, simple, 1ft. _l._ ten to twelve, falcate, linear, 5in. to 6in. long, four to five lines broad, green, glaucous; face deeply channelled; back convex, spotted white; marginal teeth numerous, white. Plant stemless. 1823.