56 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



and an undeveloped lamina. The leaf quickly perishes and all 

 of the plastic material is withdrawn into the newly formed tuber. 

 Such small tubers may be started into activity after a period of rest, 

 and may form a second leaf which also perishes during the forma- 

 tion of the second tuber or corm. A third growth in darkness might 

 be made, but the corms formed afterward were incapable of further 

 endurance or existence. (See Fig. 15.) 



D 



Fig. 15. Arisaema'jn'pkylliim. ^, seedling after first etiolation. j5, seedling after 

 second etiolation. C, seedling after third etiolation. D, adult plant after fourth etiola- 

 tion, from corm. 



The capacity of Arisaema by which it is able to construct leaves 

 both from corms, and from the seedling stage in darkness during three 

 and four successive seasons is a remarkable fact, and is illustrative 



