516 THE ARTIFICIAL SYSTEM OF LINN^US. 



2. PoLTGAmA SUPEUFLUA, the same as the last, except that 



the rays, or marginal tiowers of the head, are pistillate 

 only. 



3. PoLYGAMiA FRUSTRANEA, those with the maj-giiial flowers 



neutral (Fig. 324, 825), the others perfect. 



4. PoLYGAMiA NECESSAKIA, whcrB the marginal flowers are 



pistillate and fertile, and the central, staminate and 

 sterile. 



5. PoLYGAMiA SEGREGATA, where each flower of the head 



ftas its own proper involucre. 



6. MoNOGAMiA, where solitary flowers (that is, not united 



into a head) have united anthers, as in Lobelia. 



1003. The 23d class, Polygamia, has three orders, founded on the 

 characters of the two preceding classes ; namely, 



1. MoNCECiA, where both sepai'ated and perfect flowers are 



founded in the same individual. 



2. Dice CIA, where they occupy different individuals. 



3. Teicecia, where one individual bears the perfect, another 



the staminate, and a third the pistillate flowers. 



1004. The orders of the 24th class, Cryptogamia, are natural or- 

 ders, and therefore not definable by a single character. They are, 



1. FiLiCES, the Ferns. 



2. Musci, the Mosses. 



3. AlGjE, which, as left by'LinnsBus, comprised the Hepaticos, 



Lichens, &c., as "well as the Seaweeds. 



4. Fungi, Mushrooms, &c. 



