38 



THE LEAF. 



Fig. 75. 



Oblique, Fig. 75, (twisted,) when the 

 base of the leaf is turned upwards, while 

 the part towards the apex is horizontal, 

 or inclining downwards. Ex. Crown 

 Imperial, (Fritillaria obliqua,) Gel's Tu- 

 lip, (Tulipa Celsiana.) 



With respect to the situation and insertion of the leaves, 

 that is, their places in relation to each other, and the manner 

 in which they are connected with the stem, or petiole, the 

 following distinctions are made. 



Fig. 76. 



Radical, Fig. 76, (root leaves,) 

 when they proceed directly from the 

 root generally around the stem, but 

 never growing on it. Ex. Dandelion, 

 Side-saddle flower, (Sarracenia pur- 

 purea.) 



Fig. 73. 



Alternate, Fig. 77. Leaves are alternate when 

 they are inserted one after the other on opposite 

 sides of the stem. Ex. Large Pinweed, ( Lechca 

 major,) (Prenanthes alba.) 



Opposite, Fig. 78, one against the other, 

 when they are inserted at opposite points, 

 on each side of the stem or petiole. Ex. 

 Sage, (Salvia,) Monkey flower, (Mimulus 

 ringens. ) 



In the majority of annual and herbaceous plants, the 

 leaves are opposite. 



When oblique ? With respect to situation, when are leaves radical T 

 When alternate ? When opposite ? 



