Ampkicarpaa monoica. 349 



rocky hillside, covered with a dense growth of trees, to 

 find in certain localities, plants of Amphicarpaa in abun- 

 dance, twining around each other and trailing over the soil, 

 or occasionally rising higher. Only glimpses of sunlight 



through the thick foliage of the trees ever reach these 

 plants. No purple flowers are borne here; sometimes a 

 few ^reen aerial ones ; but the number of terrestrial flowers 

 must be truly striking. If these localities are visited in 

 spring the young plants form a close bed of green ; later a 

 dense tangled mass of vegetation results. 



Character of Plants Resulting from Special 



Seeds. 



As previously stated there are four types of seed— [a) 

 from purple flowers, (/;) from green aerial, {c) terrestrial, 

 (cf) winter type. 



Any of the above seeds will give rise to a plant capable 

 of producing terrestrial seeds. 



The terrestrial seed will, in summer, give rise to a plant 

 which may bear a, b, c. This is equally true, if the terres- 

 trial seed has been derived from a plant produced from a 

 purple, a green aerial, or a winter type seed. 



What possibilities lie in plants raised from the other 

 seeds can not yet be confidently stated as a sufficient number 

 of experiments has not been performed. It is likely that 

 the seed of the winter type produces all three kinds of 



flowers. 



The sharp dimorphism referred to in the early portion 

 of this paper, seems to disappear as the sunlight increases 

 in intensity, for then all transitions from the tall vigorous 

 twiner to low-growing feeble specimens exist. 



In the localities where purple flowers fruit abundantly, 

 germinating seeds of this type have not been found. Hun- 

 dreds of seedlings have been uprooted, and terrestrial seeds 

 only have been seen. If none of the preceding germinate, 

 there would seem to be a tremendous waste of energy in the 

 plant, for in some cases the amount of seed produced is 



