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 n 



Fig. 121. — Flowers of Willow (magnified). 

 I, starainate fiower ; n, pistillate flower. 



FlQ. 122. — Bell-Shaped 

 Corolla of Bellflower 

 (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 J, 

 borne on a stalk called the filam.ent, Fig. 127 a. 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 



