THE INFLORESCENCE AND FLOWER. 



43 



Other forms of irregular gamopetalous corollas may be 

 described as anomalous. 



A strange aspect is often given to a corolla by a crown 

 or corona, and by spurs and scales. 



SCALES. On the inner surface of the petals of many 

 flowers, scales, and hair-like processes of various kinds, are 

 often seen. Figs. 139, 140 are examples. 



Sometimes these scales become more or less united, 

 and form a cup-shaped part, as shown in Fig. 141. This 



FIG. 142. 



FIG. 143. 



is called a corona, and the corolla is said to be crowned. 

 A petal may grow outward, so as to form a bag or sac 

 (Fig. 143) ; it is then termed saccate. Sometimes this 

 growth is prolonged into a spur. All of the petals in 

 Fig. 142 are seen to be spurred. 



A nectary is a little gland containing sweet liquid, on 

 the claw of a petal. 



EXERCISE XVII. 

 Symmetry of Flowers. 



Look carefully at the pictures and explanations of this 

 exercise. Count the sepals in Fig. 144. Count the petals 

 and stamens. Observe the two-lobed stigma of the pistil, 

 which shows the number of carpels. Has each of the 



