CHAPTER SEVENTH. 



FLORAL SYMMETRY, PHYLLOTAXY, PREFOLIATION, 

 CYMOSE INFLORESCENCE, ETC. 



EXERCISE LVII. 

 Numerical Plan of Flowers. 



WHEN, in examining a flower, you count the parts of 

 its calyx and corolla, the stamens and the carpels, and find 



that some particular number oc- 

 curs again and again ; and when, 

 in case of deviation, you fre- 

 quently find multiples of this 

 number, the plan of the flower 

 is said to be based upon it. For 

 instance, the plan of the flower 

 represented in Fig. 383 is based 

 on the number three. The plan 

 of the flower represented in Fig. 

 384 is based on the number four, 



and that of Fig. 385 upon the number five. In other 

 words, in Fig. 383, three, or its multiple, six, is the con- 



FIG. 383. 



FIG. 384- 



FIG. 385. 



