SYSTEM OF LINNAEUS. 155 



terms as designate the first thirteen classes, Monandria, 

 Diandria, and so on to Polyandria. 



12. The nineteenth class, Syngenesia, containing 

 plants whose flowers are collected together within a com- 

 mon involucrum, has six orders according to Linnaeus ; 

 but five only are generally allowed. These are Polygamia 

 aqualis, in which the plants have the florets both of the 

 disk and ray hermaphrodite ; Polygamia superflua having 

 those of the disk hermaphrodite, and those of the ray 

 pistilliferous ; Polygamia frustranea having those of 

 the disk hermaphrodite, and those of the ray neuter ; 

 Polygamia necessaria, having the florets of the disk sta- 

 miniferous, those of the ray pistilliferous ; and Polyga- 

 mia segregata, having the florets, which are included 

 within the common involucrum, provided with proper 

 calyces besides. Theother order, Monogamia, is founded 

 upon the plants not having their flowers collected toge- 

 ther in heads. These plants are now put under other 

 classes. 



13. The 20th, 21st, and 22nd classes, Gynandria,Mo- 

 noceia, andDitecia, have their orders dependent upon the 

 number and relationship of connection of the stamens, 

 and receive their names accordingly. 



14. The 23rd class has three orders, Moncecia, 

 Dicecia, and Trioecia formed as these classes are. 



15. The 24th, or last class, Cryptogamia, has the 

 orders dependent upon the general natural relationships 

 the plants bear to each other, as Filices, Musci, etc. 



16. The following table will give a general view of 

 the System of Classification of Linnaeus : 



