

THE FLOWER. 45 



stamen directly in front of or within a petal ; and the parts 

 are said to be opposite (Fig. 99). But in the other case the 

 petals are in frout of or within the 

 spaces between, that is, alternate A/^%^ 

 Avith the sepals, and the stamens 

 alternate with the petals ; then the 

 parts of the flower are said to be "^ ^°'^ 



alternate (Fig. 100). When the parts of the flower, espe- 

 cially of the calyx and corolla, are each three in number, 

 the flower is said to be three-parted ; and it is generally 

 found that three-parted flowers are borne on plants which 

 have parellel-veined leaves. If the parts 

 are in 4's or 5's, the flowers are respect- 

 ively four or five-parted ; such flowers gen- 

 erally accompany netted-veined leaves. 

 ''* 55- When the sepals are free, or dis- 



I pi6«, tinct from one another, the calyx is said 



101 to be polysepalous (Gr. polus, many) ; 



and when the petals are free, the corolla is polypetalous 

 (Fig. 101). The sepals may be united edge to edge, so that 

 only their upper ends are free, by which the number form- 

 ing the cup or calyx may be deter- 

 mined. The calyx in such case is 

 said to bs monosepalous (Gr. 

 monos, one), or gamosepalous (Gr. 

 gamos, union). When the petals are 

 united, the corolla is monopeta- 

 lous, or gamopetalous (Fig. 102). 

 This union of similar parts or cohe- 

 sion, as it is called, gives rise to a 



Fig. 99. Diagram of a flower with parts opposite. Fig. 100. Diagram of a flower 

 with parts alternate. Fig. 101. A polysepalous and polypetalous flower. Fig. 102. 

 A Rotate corolla. 



