254 The reformed Sexual System of Linnceus, 



If. Orders taken from some curious Particularity in the 

 Stamina, 



XIII, Didynamia , . . four stamina, two long, two short* 



XIV. Tetradijnamia six stamina, four long, two short. 

 XV. Icosajidria .... twenty or more stamina, inserted 



on the calyx or corolla. 

 XVI. Monadelphia . . filaments united in one body. 

 XVII. Diadelplda . . . filaments united, forming two 



bodies. 

 XVIII. r^hjadelphia ,. filaments united, forming three 



or more bbdies. 

 JXIX. Syngenesia , , , five anthers united. 

 XX. Gynandria . . , stamina arising from the pistil. 



XXI. Monoecia stamina apart from the pistil on 



the same plant. 



XXII. Dloecia stamina apart from the pistil on 



different plants. 

 XXIII. Polygamia .... bisexual flowers, and unisexuaL 



Class Cryptogamia has the Natural Orders, 

 1. Fiiices, II. MuscL III. Algce. IV. Fungi^ 



REMARKS. 



T. — ^The Class IV. Tetrandria, being a numerous one, 

 Linnaeus chose to separate it into two, and an opportunity 

 presented itself from the consideration of the difTefences 

 which occur in plants having four stamina, from the pro- 

 portion oi ihtst. Didynamia expresses this ifierence; and 

 the flowers are either ringent ,or personate, a natural tribe. 

 But as all the ringent flowers are not included in the class 

 Didynamia, some coming under class II.Diandria, there 

 can be no good reason for not making this real division of a 

 class into an order. The system hence becomes more easy 

 and regidar, and in fact, freq^iently, more natural. 



II. — ^The Class VI. Hkxandria, also readily separates 

 into two parts, from the like consideration of the proportion 

 in the stamina, and Tetradynamia contains the natural 

 trihe of cruciform plants. 



III.— The 



