XII] 



BOTANY. 



(d) Whether the flower is regular or irregular 

 (Par. 83). 



(e) Whether the flowers are bisexual, having both 

 stamens and pistil (buttercup), or unisexual, having 

 one only of these; and if the latter, whether the 

 flowers that bear the stamens are monoecious, that 

 is, on the same individual with those that bear the 

 pistil (oak, nut), or diccecious, that is, on another 

 individual (willow, common nettle). 



(/) Whether the calyx is above the level of the 

 ovary or below it. 



A. Complete flowers with inferior perianth (the 

 calyx and corolla being below the ovary). 



Buttercup (Fig. 22). Flower regular. Calyx of 5 

 free sepals. Corolla of 5 free petals alternate with the 



FIG. 22. Vertical section of Buttercup flower, enlarged. 



sepals. Stamens many, seated on the receptacle. 

 Pistil of many free carpels. 



