242 



ORDERS. 



22. Dioecia has stamens on one plant, and pistils on 

 another, as in Valisneria and Poplar. 



23. Polygamic/, has stamens and pistils either in the 

 same flower, or in different flowers of the same plant, 

 or in different plants, as in Ficus and Ash. 



24. Cryptogamia. — This class embraces the imper- 

 fect plants whose floral organs are invisible or wanting. 



ORDERS. 



The orders of the first thirteen classes are founded 

 on the number of pistils. 



The 14th class is subdivided into two orders, Gym- 

 nospermia, having (usually four) naked seeds as in the 

 Marjoram and Balm ; and Angiospermia having num- 

 erous seeds in a capsule, as in Snapdragon and Fox- 

 glove. 



The loth class has two orders, distinguished like 

 the preceding by the fruit. The seeds of the first, 

 Siliculosa, are enclosed in a silicle, as in the Shep- 

 herd's-purse. The seeds of the second, Siliquosa, are 

 in a silique, as in the Wall flower and Cabbage. 



The orders of the 16th, 17th and 18th classes are 

 founded on the number of the stamens. 



