. 
20 A COMPENDIUM OF 
Polygamia segregrata, each flower hav- 
ing its own involucre. 
Monogamia, flowers with united anthers, 
and a solitary inflorescence. 
The above names indicate the character of 
the flowers. , 
The orders of the 23d class are based on the 
likeness or characters in the 21st and 22d classes. 
Tricecia, perfect flowers on one plant, 
flowers with stamens on another, and 
pistillate flowers on a third plant. 
The 24th class includes the Felices or ferns, 
and the Musci or mosses belong to the natural 
order, and are, therefore, not defined artificially. 
