.Ch. XIII. | STAMENS 75 



304. When a corolla is monopetalous, the number of sta- 

 mens is usually either equal or double, or kalf that of the di- 

 visions of the corolla ; the stamens in such flowers never exceed 

 twenty. 



305. In polypetalous corollas, the number of stamens may 

 be much greater. When the number of stamens equals the 

 divisions of the corolla, they usually alternate with these divi- 

 sions of the corolla, half of the stamens are usually placed in 

 the intervals of the divisions, and the remaining half before each 

 lobe of the corolla, corresponding to the intervals in the divi- 

 sions of the calyx. If any of the stamens are barren or with- 

 out anthers, they are those which are placed before the lobes 

 of the corolla. 



306. In commencing the analysis of flowers according to the 

 Linnsean system, you learned that the number of stamens, theii 

 position, relative length, and connexion, taken either singly or 

 in combination, afford certain and distinctive marks for purposes 

 of classification. 



307. In the first place we find the stamens differing in num- 

 ber, in different plants ; some plants have but one, some two, 

 and so till we come to ten ; when they have more than ten sta- 

 mens, we find the number in the same plant varies, and there- 

 fore we cannot depend on the circumstance of number for 

 further classification. 



308. Secondly, we regard the position, and consider whether 

 the stamens are inserted upon the calyx or the receptacle, 

 thus furnishing an eleventh and a twelfth class. 



309. Thirdly, inequality in t/tc length of stamens, consider- 

 ed with respect to number, furnishes us with a. thirteenth and 

 fourteenth class. 



310. Fourthly, the connexion or union of stamens gives us 

 the fifteenth class, where the filaments of the stamens are united 

 in one set ; the sixteenth class where they are in two sets; the 

 seventeeth where the anthers of the stamens are united. 



311. Fifthly, the three remaining classes of phenogamous 

 plants are distinguished by the position of the stamens with 

 respect to (he pistils. In the eighteenth class the stamens 



commencing the 

 analysis of flowers'? 



307. What is the first thing in which we find stamens to differ 1 



309. What do we regard secondly with respect to the stamens ? 

 300. What do we observe thirdly with respect to the stamens 1 



310. What do you observe fourthly n? to the stamens'? 



311. What do we observe ni'hly with rc-rcct to th<' stamens? 



