188 Key to the System of 



905. Stipules minutely acicular. (Exception : some forms of 



A. Sentis) ... ... ... ... ... ... 906 



Stipules very small and membranous or absent ... 908 



906. Rough from short glandule-bearing hairlets. 



Tall, visciduluous shrub ; phyllodia rather short, from 

 narrowly elliptic-lanceolar to broad-linear, recurved at 

 the summit, otherwise almost straight ; headlets of flowers 

 on rather short stalks; fruit narrow, somewhat curved, 

 convex ; arillar appendage rather pale, clasping only the 

 base of the seed. A. aspera. 



Smooth or beset with non-glandular hairlets... ... 907 



907. Phyllodia flexuous. 



Shrub, finally tall ; phyllodia obliquely or dimidiately ovate- 

 or narrow-lanceolar, recurved at the summit ; stipules 

 often very conspicuous ; stalks of flower-headlets about 

 as long as the phyllodia or longer ; fruit very narrow, 

 beset with hairlets ; arillar appendage rather pale, clasp- 

 ing only the base of the seed. A. arniata. 



Phyllodia flat. 



Shrub or small tree ; phyllodia from elliptic-lanceolar to 

 broad-linear, somewhat oblique ; stipules often partly un- 

 developed ; headlets of flowers conspicuously stalked, 

 solitary or oftener two together, rarely in racemes ; fruit 

 smooth, flat, broad ; valves (pericarp) thin ; seeds placed 

 transversely, very turgid, mottled ; arillar appendage 

 much twisted, clasping only the base of the seed. 



A. Sentis. 



908. Phyllodia as long as or shorter than the flower-stalks 909 

 Phyllodia longer than the flower-stalks ... .. 911 



909. Phyllodia narrow. 



Shrub, generally low, small, broad-linear ; phyllodia in- 

 equilateral, curved -pointed ; headlets of flowers solitary 

 or two together ; fruit very narrow, generally arched- 

 curved. A. line at a. 



Phyllodia broadish ... ... 910 



