Ch. XIII.] STAMENS 75 
304. When a corolla is monopetalous, the number of sta- 
mens is usually either equal or double, or half 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 
Linnzan system, you learned that the number of stamens, their 
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 gn 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 the 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 the pistils. In the eighteenth class the stamens 
a JS Sa Aaa aE EMR Ober 
304. What is said of the stamen of monopetalous corollas ? 
305. What is said of the stamens of polypetalous corollas? 
306. What did you learn respecting stamens, in commencing the 
analysis of flowers ? 
307. What is the first thing in which we find stamens to differ 2 
308. What do we regard secondly with respect to the stamens ? 
_ 309. What do we observe thirdly with respect to the stamens? 
ay What do you observe fourthly as to the stamens? 
(811. What do we >bserve fifthly with respect to the stamens ? 
