no 



THE WATERLILIES. 



The internodes above the epicotyl are not developed, but the stem 

 gradually thickens and enlarges into a miniature tuber. In nearly all of the 

 genus the plant is now essentially mature ; it needs only to enlarge. But 

 in Eu-castalia a marked change takes place. The internodes after a time 



Fio. GO. Seedling: leaves: (a), ff. amazomim ; a, first leaf; t>, second (first broad) leaf; c, third leaf; 

 e, epicotyl ; p, primary root ; (, first secondary root ; (h), N. cacrulea ; 1, 2, 3, 4, first and following broad 

 leaves ; (c), first floating leaf, X. odnrata yiganlen ; (rt), K. lotus var., 1, 2, 3, 4, first and following leaves, the 

 last very young ; (e), X. zanzittarlemitt ; 1, 2, 3, first and following broad leaves ; (/), If. tetragona, 1, 2, 3, first 

 ami following broad submerged leaves ; 1 fl, first floating leaf. Twice uatural size. 



regularly, but slightly, elongate, and the stem suddenly becomes plagio- 

 tropic ; thus a tiny horizontal rhizome is produced. From this point 

 onward maturity is simply a matter of size. 



In structure the characteristic features of the order are evident at a 

 very tender age. While the primary root is still a mere papilla, the root- 

 cap consists of a single layer of cells, and behind it are three to four close 



