STRUCTURE OF THE FLOWER AND ITS ORGANS 201 



FIG. 142. 



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 

 ARose,Longitudi- 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 A, staminate flower ; B, pistillate flower. 



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

 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. 143. Flowers of Willow. 

 (Magnified.) 



