STRUCTURE OF THE FLOWER AND ITS ORGANS 201 
portions of the limb are known as divisions, teeth, or 
lobes." Special names of great use in accurately describing 
plants are given to a large number of forms of the gamo- 
petalous corolla. 
names are here given, in connection with 
the figures. 
Only a few of these 
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 
ie portion, the anther (Fig. 149, a), borne on a 
ARose, Longitudi- stalk called the filament (Fig. 149, f), which 
nal Section. 
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 
Fie. 143.— Flowers of Willow. 
(Magnified.) 
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. 
