FLORAL ENVELOPES 



123 



is:i. Flower of fuchsia in section. 



lobed or divided, in which ease the divisions are called 

 calyx -lobes. In like manner, the corolla may be com- 

 posed of petals, or it may be of 

 one piece and variously lobed. A 

 calyx of one piece, no matter how 

 deeply lobed, is gamosepalous. A 

 corolla of one piece is gamopetal- 

 ous. When these series are of 

 separate pieces, as in Fig. 1S7, the 

 flower is said to be polysepalous 

 and polypetalous. Sometimes both 

 scries are of separate parts, and 

 sometimes only one of them is so 

 formed. 



252. Thf j floral envelopes are 

 homologous with leaves. Sepals and 

 petals, at least when more than 

 three or five, are each in more than 



one whorl, and one whorl stands below 



another so that the parts overlap. 



/4t. , 11/ They are borne on the expanded or 



y ~^-'. thickened end of the ilower- stalk : this 



end is the torus. In Pig. 1ST all the 

 190. Pistil of garden pea, i -, , . , 



the stamens being pulled parts are seen ;is attached to the COrUS. 



ft.^so"sSCs d howi n2 This par. is sometimes called recep- 



the single compartment. t; .] (1> i, u , t |,j s w ,, n ] [ g ., C Ommon- 



Language term of several meanings, whereas torus h;is no 

 other meaning. Sometimes one part is at- 

 tached to another part, a> in the fuchsia //" 

 (Fig. L89) in which the petals are borne 

 on the calj \ -tube. 



253. ESSENTIAL ORGANS. The eeiiti,il 1 '," Simple pistils of 



butte re a p, "in- m 



organs are of two Beries. Thej are also longitudinal section, 

 homologous with leaves. The outer series is composed of 



the stamens. The inner series is composed of the pistils. 



