C 7 ] 



DESCRIPTION OF SPECIES. 



KEY. 



leaves in section fiat to concave but never channelled throughout : 



Teeth minute, close set . Species A. 



Teeth larger, more or less remote : 



Leaves in a lax rosette or tufted, never less than 3 feet in 

 length . 

 Perianth segments not constricted towards the tip : 



Leaves broadest in the middle, tapering to both extremi- 

 ties : 



Leaves oblong lanceolate, neck sharply constricted . . Species B (americanftj Lhm, 

 Leaves linear oblong, neck not constricted : 



Marginal prickles pointing uniformly downwards, 



leaffiattish throughout Species D (Vera-CrUZ, Mille 



Marginal prickles of upper part of leaf pointing 



upwards, leaf deeply trough-shaped in upper fourth Species (7 - - 



Leaves hardly widened in the middle very narrow in 

 proportion to their length : 

 Leaves linear lanceolate curving outwards throughout 



their length, terminal spine acicular .... Species E (CantalRj Roxb.) 



Leaves narroivly oblong, not curving, stiff', erect, 



terminal spine conical from a stout base . . . Species F 



Perianth segments narrowed from about the middle to the 

 ligulate tip : 



Leaves straight Species G (sisalana, Perrine 



Leanes drooping from their upper third or less . . Species H 



Leaves in a close globose rosette never exceeding 3 feet in length Species / (Wight!!, nobis) 



Leaves in section canaliculate Species JC (decipiens, Baker 



