So AN INTRODUCTION 



Subularia, Myagrum and Vella. 2. Those in which 

 the Silicula is notched at the apex, of which there 

 are nine, viz. Iberis, Alyssum, Clypeola, Peltaria, 

 Cochlearia, Lepidium, Thlaspi, Biscutella and Ana- 

 statica. 



ORDER II. SILIQUOSAF, comprehending those 

 plants whose pericarpium is a siliqua. This order 

 contains eighteen genera, distinguished into 1. Those 

 where the calyx is close at top, and the foliola ap- 

 proaching lengthways ; of which there are ten, viz. 

 Raphanus, Erysimum, Chamira, Cheiranthus, Hes- 

 peris, Arabis, Brassica, Turritis, Dentaria and Ri- 

 cotia. 2. Those where the calyx is open, its foliola 

 diverging at the top, of which there are eight, viz. 

 Cram be, Isatis, Bunias, Cleome, Cardamine, Sinapis, 

 Sisymbrium and Heliophila. 



CHAP. XIX. 



OF THE SIXTEENTH CLASS MoNADELPHlA*. 



THIS Class consists of such plants as bear herma- 

 phrodite flowers, furnished with one set of united sta- 

 mina. This class consists of nine orders. The cha- 

 racters of the flowers are as follow. 



Character of the Class MONADELPHIA. 



CALYX A perianthium always present, persist- 

 ing, and in most genera, double. 



* In this class the calyx is of great moment for distinguish, 

 ing the genera, and fixes the limits with certainty. They were 

 formerly distinguished by the fruit ; which not being found 

 sufficient, recourse was had to the leaves of the plant. The 

 plants of this class are esteemed to be emollient and mu- 

 cilaginous. 



