MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 73 



twining occur, a result in accord with tests with all other etiolated 

 climbers. The second etiolation did not exhaust the tubers, and Ar/s- 

 tolochia is to be added to the list of species capable of several efforts 

 to reach sunlight while being nourished from storage organs. 



Asparagus officinalis L. 

 Clumps of Asparagus officmalis in a resting condition were placed 

 in the dark chamber in October, 1901, and soon began to send up 

 stems. The normal cultures in the greenhouses formed shoots about 

 a meter in height, with many branches, the branches being subdivided 

 and bearing many cylindrical cladodes. Etiolated stems attained a 

 diameter about double that of the normal, being about the same 



Fig. 27. Portion of normal stem of Asfaragus officinalis, with branch and cladode. 



thickness as the underground portion of normal cultures, but having 

 much longer internodes. The internodes of normal and etiolated 

 stems were about equal. Branches were sent out by only a few of 

 the etiolated stems, generally by those which had fallen prostrate 

 after a growth of about .7 of a meter. The branches were thicker 

 than the normal and attained a length of about 10-15 cm., and were 

 not subdivided. The terminal portion of the stem retained its apo- 

 geotropism and curved upward when the stem had fallen by reason 

 of its mechanical weakness. 



