46 



MEMOIRS OF THE NEW YORK fJOTANICAL GARDEN. 



Nearly all of the tubers from which etiolated stems were devel- 

 oped in these cultures survived and contained a large amount of 



storage material, and some of them 

 showed a second growth similar to 

 the first, without perishing. Apios 

 may be classed as a plant capable 

 of making more than one effort in 

 different seasons to carry leafy 

 stems up to sunlight. 



D 



Aplectrum spicatum (Walt.) B.S.P. 

 Fourteen vigorous specimens of 

 Aplccti'itm s^icatwn were placed in 

 the dark chamber on December 27, 

 1898, and soon awakened. Leaves 

 were formed which reached matur- 

 ity in May, 1899. Similar cultures 

 were also made in the following 

 year. These leaves were formed 

 at the extremities of offsets which 

 run 2 or 3 cm. laterally from an old 

 corm and then develop the terminal 

 internodes as a corm with its apical 

 bud apogeotropic. The leaves are 

 put out during the season of swell- 

 ing of the corm. The young corm 

 receives storage matter both from 

 the old corm and from the active 

 new leaf. In the etiolated specimens 

 the corms thus formed attained 

 about twice the length of the nor- 

 mal, with the longitudinal diameter 

 much greater than the transverse, 

 which is the reverse of the normal 

 behavior. 



Fig. S. Aplectrum ipicatuni. A. etiolated 

 plant with young corm, scales and attenuated 

 leaf. B, old corm and young corrn formed 

 in darkness. C, intlorescence of etiolated 

 plant. D, single etiolated flower. 



