8 4 ELEMENTARY BIOLOGY. ^ [CHAP. 



P. Inside the calyx the corolla: the most con- 

 spicuous part of the flower. 



y. Inside the corolla the stamens. 

 8. Within the stamens the pistil. 



2. The calyx. 



A cup terminated at its free edge by five prominent 

 points, two dorsal, and three ventral : the five small 

 midribs running along it (one to the end of each of 

 the points) represent the free ends of five sepals, 

 which are united below. 



3. The corolla. 



a. Composed of five pieces or petals. 



a. On the dorsal side, a single large piece (uexil- 

 lum) expanded at its free end and folded over 

 the rest. 



/3. On the sides, two oval pieces (al<z), each 

 attached by a distinct narrowed stalk (unguis). 



y. The inferior part of the corolla (carina\ com- 

 posed of two oval pieces united along their 

 lower edge but readily tearing apart. 



4. The stamens. 



a. Ten in number, each consisting of a stalk-like 

 part, the filament, terminated by a small knob, 

 the anther. V . 



b. The union of the filaments for three-fourths of 

 their length to form the stamen-tube : the sharp 

 bend of the filaments towards the upper side at 

 the point where they separate from one another. 



f. Tease out an anther in water and examine with 

 | obj. : there will be found numerous 



