46 EXPOSITION or THE 



thcrs, and a Proper Calyx, all included in one 

 Common Calyx. 



The 6th Lmnasan Order, Monogamia, consisting of 

 Simple Flowers, with united Anthers, is abolished, as 

 being unnatural, and extremely uncertain, fig. 195 b. 



The Orders of the 20th Class are distinguished by 

 the number of their Stamens. Gynandria Monandria> 

 fig. 70-72. Tetrandria, 73-76. 



Those of the 21st and 22d by the same circum- 

 stance, or by any other character of the preceding 

 Classes founded on the union of the Filaments. 



The Orders of the 23d are, 



1 . MONOECIA. The two or three different descrip- 

 tions of Flowers all on the same plant. 



2. DIOECIA. The different descriptions of Flowers 

 on two separate plants. 



3. TRIOECIA. The same on three separate plants. 

 The Orders of the 24th Class are natural orders or 



families. 



1. FILICES. Ferns, fig. 96-98. Equisetum sylva- 



ticum. 99-101. Aspidium FULv-mas. 102-104. 



Scolopendrium vulgare. 

 - 2. Musci. Mosses, fig. 105-108. Dicranum pur- 



pureum. 109-113. Hooker ia lucens. 



3. HEPATIC^. Liverworts, fig. 114, 115. Jun- 

 germannia multifida. 



4. LICHENES. Lichens, fig. 116, 117. Opegrapha 

 scrlpta. 118-120. Lecanora murorwn. 121, 

 122. Peltidea canina. 



