CHAP. II.] 



MIMOSA. 



41 



has its flowers in such dense heads that it is 

 difficult at first sight to discover that they are 

 Papihonaceous. On examination, however, it 

 will be found that each separate flower has its 

 standard, wings, and keel, though the wings 

 are so large as to hide the keel, and nearly to 

 obscure the standard. The calyx is tubular at 

 the base, but divided above into five long, awl- 

 shaped teeth, that stand widely apart from each 

 other. The legume has only one or tvro seeds, 

 and it is so small as generally to be hidden by 

 the calyx. 



TRIBE II.— MIMOSA. 



The second division of Leguminosse com- 

 prises those plants w^hich have heads of flowers 

 either in spikes or 

 balls, like those 

 shown in Jig. 15. 

 This figure repre- 

 sents two heads of 

 flowers oi Acacia ar- 

 mata, a well-known 

 greenhouse shrub, 

 of their natural 

 size ; and Jig. 16 

 shows a head of 

 similar flowers mag- fig. is.-flowers ast> sprig of 



• o 1 T J 1 ^ , Acacia armata . 



nined. In the lat- 



■^i;J^ 



