82 GENERA OF CLASS SSfc ICOSANDRIA. 



styles. Of this order there are two genera, viz. Heliocarpus 

 ...and Agrimonia {agrimony). 



Order 3. Trigynia, comprehends such plants as have three 

 styles. This order contains three genera, viz. Reseda (dyer's- 

 weed)... Euphorbia (spurge)... and Vismea. 



Order 4-. Tetragynia, contains such plants as have/ow styles, 

 comprehending tivo genera, Aponogeton...Calligonum. 



Order 5. Pentagynia, comprehends such plants as have five 

 styles. This order contains two genera, viz. Glinus.,.Black- 

 wellia. 



Order 6. Dodecagynia, comprehends such plants as have 

 twelve styles. This order contains but one genus, viz. Semper- 

 vivum (houseleek). 



CHAP. XV. 



OF THE TWELFTH CLASS, ICOSANDRIA*. 



THIS class consists of such plants as bear bisexual flowers, of 

 the following characters, viz. 1. A calyx monophyllous, and 

 concave. 2. The corolla fastened by its claws to the inner 

 side of the calyx. 3. The stamina twenty or more. As the num- 

 ber of stamina in this class, notwithstanding its title, is not limit- 

 ed, an attention must be had to the two first characters, to di- 



* This class furnishes the fruits most in esteem. 



