- - 337 — 



Leaves fibrous, dagger-shaped, straight . . A. angiistifoUa murginata. 

 Leaves with continuous horny margin . . A. lophnntha marginata. 

 Variegation median (passing into the next). 



Leaf witliout end spine or witli a short horny 



button Furcrciea gigatitea »icdio-picta. 



End spine präsent (Agave). 

 Leaves not horny-margined. 

 Leaves fleshy: plants stemless. 



Large, coarselyrepand, withlargedistantteeth . A. annricaiia medio-picta. 

 Small, not repand : prickles close and very 



small .1. albicans medio-picta. 



Leaves fibrous: plants with a trunk . . . A. fourcroi/des »ledio-picta. 

 Leaves with continuous horny margin connecting the very 



large teeth A. xglonacantha medio-picta. 



Variegation striata (passing into the preceding): end spine present (Ag-ave.) 

 End spine stout, scarcely decurrent, shallowly grooved : leaves thick, 



elongated, glaucous A. americann striata. 



End spine slender, decurrent, deeply channeled : leaves thinner, with 

 thin edges, broad, green when mature . . . A. llookeri striata. 



Synony mic List. 

 Under each genus, the arrangement of species follows chronologi- 

 cally the ascertained first appearance of a variegated form of each- 

 but all variegations of one species are placed together. Many of 

 the references cited are too indefinite to be located with certainty 

 under a given form: such citations are grouped coUectively under 

 the species or its more generalized variegation type. No doubt some 

 of the Synonyms under Ä>i(ioe americana nuirglnata and A. pida 

 should be transposed, but if so this can be secured only through 

 thus calling attention to the uncertainty in the hope tliat the 

 unrecorded knowledge of the few living gardeners who have 

 authentic specimens bearing the doubtful names may be brought 

 to a record. Though accessible dealers' catalogues have been care- 

 fuliy searched, it is certain that many really important items in these 

 ephemeral publications have escaped notice. 



Agave americana L. 



A. (tnierlcana [variegated]. Seh 1 echten d al, Linnaea 5 : 4Q6. 

 (1830). — Wallis, Belg. Hort. 1879: 198. — Gard. Chron. n. s. 

 20: 294. (1883j. — Gard. & Forest. 6: 300. (1893). 



A. americana variegata. Steudel, Nom. 2. ed. 36. (1841). 

 ?? A. umbellata aureo-picta. De Cock, Cat. 4: 49. (1869-70). 

 Wiesner-Festschrift 22 



