Amphicarpaa monoica. 



tion, the contrast between the seedlings of aerial and 

 terrestrial seeds is evident, and becomes more pronounced as 

 growth increases (Plate XXL) The stem from the terrestrial 

 seed, as it appears above -round, is of a deep purple hue; it 



is strong, vigorous and -rows rapidly, soon carrying the first 

 pair of opposite green leaves to a height of four or six inches. 

 After this, compound leaver; are produced ; the internode 

 between the simple leaves and the first compound leaf is 

 short. When the stem is about ten inches in height 

 it exhibits an inclination to twine; if a support is within 

 reach, the plant soon becomes a vigorous twiner and 

 the internodes increase in length. The stem of the plant 

 from the aerial seed is slender, feeble and is usually 

 green. It grows during the first ten days almost to its full 

 height, which is much below that attained by the preceding 

 plant. The simple and compound leaves are about half 

 the size of those of the first described. Twining does not 

 take place ; even tying to a stick failed to induce twining 

 movements. During the winter variations from such types 

 were seen. A terrestrial was found which was low growing, 

 although it still twined. (Plate XXXV., Fig. i.) Occa- 

 sionally an aerial grew taller, or more strictly perhaps, 

 longer ; but reclined upon the ground. This striking dimor- 

 phism continued through tlie winter. Plants produced from 

 filed seeds behaved as the others. In the late spring a good 

 many of the aerial seedlings twined; their general appear- 

 ance was feebler than that of the terrestrial form. Reference 

 to these facts will again be made toward the close of this 

 paper. 



In the descriptions which follow, plants produced from 

 terrestrial seeds are intended, for they furnished specimens 

 apparently most normal in behavior. 



Below the first pair of green leaves the stem is nearly 

 smooth, above these, the stem exhibits all degrees of hairi- 

 ness. The hairs are always retrorse, and vary from a rather 

 scanty growth to a thick brown felt. The vigor of the plant 

 19 



