TO BOTANY.' 75 



plants as have many styles. This order contains 

 twenty genera, viz. Houtuynia, Hydrastis, Atragene, 

 Clematis, Thalictrum, Isopyrum, Helleborus, Caltha, 

 Anemone, Michelia, Troilius, Winttra, Uvaria, An- 

 nona, Liriodendrum, Magnolia, Diilenia, Ranuncu- 

 lus, lllicium and Adonis. 



CHAR XVII. 



OF THE FOURTEENTH CLASS DlDYNAMIA. 



THIS Class consists of such plants as bear herma- 

 phrodite flowers, furnished with four stamina ; two 

 of which are loftger than the rest : this circumstance 

 would suffice to distinguish it from the fourth class, 

 in which the four stamina are equal ; however, as 

 the flowers of this class have a particular structure, 

 there are general characters which will nearly serve 

 for the whole class ; and these we shall give at 

 length. 



Characters of the Class DIDYNAMIA. 



CALYX A perianthium, monophyllous, erect, 

 tubulous, quinquefid, with segments for the most part 

 unequal and persisting. 



COROLLA Monopetalous and erect, the base of 

 which contains the honey, and does the office of a 

 nectarium. The upper lip strait; the lower spread- 

 ing and trifid. The middle lacinia the broadest. 



STAMINA Four filaments, subulate, inserted into 

 the tube of the corolla, and inclined towards the back 

 thereof. The two inner and nearest the shortest. All 

 of them parallel, and rarely exceeding the length of 

 the corolla. The antherae lodged under the upper lip 



