300 Key to the System of 



1359. Vestiture much consisting of simple septate hairlets. 



Shrub, seldom tall, invested extensively with minute 

 glandule -bearing hairlets ; leaves short, linear, soon re- 

 curved along the margin ; headlets of flowers short, 

 terminally sessile, forming narrow leafy panicles ; floral 

 ray bluish ; fruits beset with short hairlets. 



A. Beiithami. 



Vestiture consisting of somewhat cottony hairlets ... 1360 



1360. Marginal corollas with a minute flat expansion .. 1361 



Marginal corollas with a very conspicuous flat 

 expansion ... ... .. ... ... 1362 



1361. Flowers few within each involucre. 



Bather tall; leaves linear, somewhat elongated, revolute 

 at the margin, many in clusters ; headlets of flowers very 

 small, axillary, nearly sessile ; involucral bracts blunt ; 

 expansions of marginal corollas almost obliterated ; fruits 

 beset with hairlets. A. tubuliflorus. 



Flowers several within each involucre. 



A coast-shrub, rather tall; leaves somewhat elongated, 

 from obovate-cuneate to linear, revolute at the margin ; 

 headlets of flowers axillary, sessile, small ; involucral 

 bracts blunt ; expansions of marginal corollas almost 

 obliterated ; fruits usually beset with hairlets. 



A. axillaris. 



1362. Flowers several within each involucre ... ... 1363 



Flowers few within each involucre ... ... ... 1364 



1363. Leaves from orbicular- to elliptic-ovate. 



Shrub, rather tall, much beset with very minute but usually 

 spreading hairlets ; leaves very small, recurved at the 

 margin, many in clusters, somewhat cottony underneath ; 

 headlets of flowers quite small, mostly on abbreviated 

 branchlets singly terminal; floral ray white; fruits beset 

 with very short hairlets. A. iiiicropliyllus. 



Leaves almost linear. 



Shrub, finally tall, much beset with minute but usually 

 spreading hairlets ; leaves very small, soon much spread- 

 ing, recurved at the margin, many in clusters, often 



