iv.] PRIMROSE. 31 



side, are four in number, one stamen being suppressed. 

 On this account the flower is said to be unsymmetrical, the 

 symmetry, or agreement in the number of parts in each 

 series of the flower-leaves, being interrupted. The stamens 

 are adherent to the lower part of the corolla, consequently 

 epipetalous, and two are long and two short, the lower 



FIG. 20. Vertical section of a fljwer of White Deadnettle. 



and outer pair being longer than the upper and inner ; 

 hence they are termed didynamous. The pistil is syncar- 

 pous, consisting of two carpels, as indicated by the bifid 

 stigma, and the ovary is superior and deeply four-lobed, 

 so that the style springs from the centre and base of 

 the lobes of the ovary. Deadnettle has calyx inferior, 

 gamosepalous ; corolla gamopetaloiis, irregular; sta- 

 mens epipetalous, didynamous ; pistil syncarpous, ovary 

 superior. 



10. PRIMROSE, COWSLIP, or AURICULA. Whichever 

 may be most convenient. The calyx is free, the sepals 

 coherent." The corolla regular, the petals coherent. Note 

 carefully the position of the stamens with respect to the 

 lobes of the corolla. We have already observed the 

 tendency to alternation of parts which usually obtains in 

 the arrangement of the floral organs, but here we find the 



