176 



SEEDLINGS. 



" no one who has ever looked at a young plant can have failed to 

 be struck by the contrast they afford to the older specimens be- 

 longing to the same species. This arises partly from the contrast 

 which the cotyledons, or end leaves, afford, not only to the final 

 leaves, but even to those by which they are immediately followed." 



Fig. 37. — Seedling of Impatiens 

 balsamma, half nat. size. 



Fig. 38. — Seedling of Menispej-muni 

 canadense, half nat. size. 



Some cotyledons are narrow, as in Foeniculum, Fig. 35, and 

 Ceratocephulus, Fig. 36. In Ceratocephulus (and in many other 

 species) the order of growth of each successive leaf is shown. 

 and its shape described. Thus, leaves 



T, 2 are linear, entire, similar to the cotyledons. 



3 Spathulate ; apex tridentate. 



4 Spathulate, trifid. 



5, 6 Cuneate, unequally trilobed. 

 7, 8 Cuneate, tripartite ; segments linear, lateral ones 

 bifid at apex. 

 9 Tripartite, wnth linear segments. 



10 Tripartite, lateral segments unequally lobed. 



1 1 Doubly bipartite. 



