256 ENGLISH WILD FLOWEBS. 



founded on the seed-vessel. 1, Siliculosa, having 

 seeds in a short pod or pouch broader than it is 

 long ; and 2, Siliquosa, where the pod is longer than it 

 is broad. 



The orders of the sixteenth, seventeenth, and eigh- 

 teenth class, are founded on the number of the stamens, 

 and they consequently receive the same names as the 

 first thirteen classes tPriandria, Pentandria, and so on. 



In the nineteenth class the orders are three, 

 founded on the structure of the flower. 1, JEgualis, 

 all the florets perfect ; 2, Superflua, florets of the disk 

 perfect, those of the ray with pistil only, and hence 

 superfluous ; 3, Frustranea, florets of the disk per- 

 fect, of the ray with neither stamens or pistil ; 

 4, Necessaria, florets on the disk with stamens, 

 those of the ray with pistils ; 5, Segregata, florets in- 

 cluded within the common involucrum provided with 

 proper calyces. 



In the twentieth class, the orders are founded on 

 the number of the stamens Monandria, Diandria, &c. 



The twenty-first and twenty-second classes have 

 orders founded on the number, and other peculiarities 

 of the stamens Monandria, Diandria, &c. 



In the twenty-third class, the orders are founded on 



