146 ELEMENTS OF BOTANY. 
180. Union of Similar Parts of the Perianth. — The sepals 
may join or cohere to form a calyx which is more or less 
entirely united into one piece, as in Figs. 115, 117. In this 
case the calyx is said to be gamosepalous, that is, of-wedded- 
sepals. In the same way the corolla is frequently gamo- 
petalous, as in Figs. 122,123. Special names are given to a 
large number of forms of the gamosepalous corolla, and these 
names are of great use in accurately describing plants; 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 
i Il Fic. 122. — Bell-Shaped 
Fia. 121. — Flowers of Willow (magnified). Corolla of Bellflower 
I, staminate flower ; II, pistillate flower. (Campanula). 
unconnected with each other, that is, polysepalous or poly- 
petalous, they are said to be distinct. 
181. Parts of the Stamen and the Pistil.— The stamen 
usually consists of a hollow portion, the anther, Fig. 127 6, 
borne on a stalk called the filament, Fig. 1274. Inside the 
anther is a powdery or pasty substance called pollen. Not 
infrequently the filament is lacking. The pistil usually con- 
sists of a small hollow chamber, the ovary, which contains 
the ovules or rudimentary seeds, a slender portion or stalk, 
called the style, and at the top of this a ridge, knob, or point 
