Principles of Classification, 9r 
included under it have only one stamen. The 2d, 
class, Diandria, indicates two stamens ; the 3d, Trian« 
dria , three stamens; 4th, Tetrandria, four stamens; 
5th, Pentandria, five stamens.; 6 th, Uexandria t six sta- 
mens ; 7th, Ueptandria, seven stamens ; 8 th, Octan~ 
dria y eight stamens; 8th, Enneandria , nine stamens; 
10th, Decandria, ten stamens ; 11th, Dodecandria, from 
12 to 19 stamens ; 12th, Icosandria, 20 or more sta- 
mens ; and, 13th, Polyandria, in which the stamens are 
very numerous. But, in the two last classes, the situa- 
tion of the stamens must be taken into considerations 
When they arise from the inside of the calyx, such, 
plants belong to the class Icosandria, as in the straw- 
berry and bramble, the cherry, and the myrtle ; but 
when they are inserted into the receptacle or base of 
the flower, they fall under the class Polyandria, of which 
the poppy and anemone are good examples. 
The 14th class, Didynamia, is distinguished by the 
proportion in the length of the stamens, which are 
four in number, two of which are long and two short. 
This is justly reckoned a natural class, for it includes 
plants which exhibit the same general character in the 
structure of their flowers, to which the denomination 
ringent or personate has been applied. The deadnettle^ 
foxglove, and snapdragon are examples. 
The 15th Class, Tetr adynamia, is also a natural class, 
and is distinguished by four long and two short sta«? 
mens ; the flowers of this class are called cruciform, be- 
cause the four petals of the corolla are set in opposi- 
tion to each other in the form of a cross, as wallflower, 
radish, and mustard. 
In the 16th class, M.onadelphia , the stamens are uni- 
ted by their filaments into a tube, as is distinctly seen 
