STRUCTURE OF THE FLOWER AND ITS ORGANS 201 





portions of the limb are known as divisions, teeth, or 



lobes. 1 Special names of great use in accurately describing 



plants are given to a large number of forms of the gamo- 

 petalous corolla. Only a few of these 

 names are here given, in connection with 

 the figures. 



When the parts of either circle of the 

 perianth are wholly unconnected with each 

 other, that is, polysepalous or polypetalous, 

 such parts are said to be distinct. 



214. Parts of the Stamen and the Pistil. 

 The stamen usually consists of a hollow 

 portion, the anther (Fig. 149, a), borne on a 

 stalk called the filament (Fig. 149, /), which 

 is often lacking. Inside the anther is a pow- 



dery or pasty substance called pollen or microspores (Sect. 



374). The pistil usually consists of a small chamber, the 



ovary, which contains the ovules, macrospores (Sect. 374), 



or rudimentary seeds, a slen- 



der portion or stalk, called the 



style, and at the top of this a 



ridge, knob, or point called 



the stigma. These parts are 



all shown in Fig. 150. In 



many pistils the stigma is 



borne directly on the ovary. 

 215. Union of Stamens with 



Each Other. Stamens may 



be Wholly Unconnected with J,staminate flower; B, pistillate flower. 



1 It would not be safe to assume that the gamosepalous calyx or the garno- 

 petalous corolla is really formed by the union of separate portions, but it is 

 very convenient to speak of it as if it were. 



FIG. MS. -Flowers of wmow. 



(Magnified.) 



