Amphicarpaa monoica. 



More observations are needed on this point. At present 

 il cannot be stated in which portion of the raceme, reduc- 

 tion is most likely to take place, as the blooming season ap- 

 proaches. 



The seasonal conditions and the general environment 

 exert a marked influence upon the number of purple 

 flowers produced. A hot, dry season is very unfavorable. 

 The summer of '95 showed but few racemes; 111 '96 the 

 plants were covered with them. In the shaded portion of 

 the woods purple flowers are rarely produced; on the other 

 hand, too much sun does not seem favorable. Amphicarpaa, 

 grown in the Botanic Garden in two places where there was 

 constant sunlight, showed but a very few flowers, although 

 the plants were provided with a fair supply of water. 



The calyx is greenish-white, if the corolla is pale, other- 

 wise purplish-white, flecked with deep purple; in both cases 

 it is pubescent. It is four-parted, the teeth acuminate and 

 dissimilar. Thus far nothing has been seen to indicate the 

 presence of a fifth vascular bundle. It is possible in 

 younger buds, some evidence may yet be found. In the bud 

 the calyx parts are valvate, the tips being spirally twisted. 

 The calvx is about half the length of the corolla, it is 

 swollen at the base in the posterior region, and, as the 

 flower-parts expand, the appearance is that of inflation. It 

 persists at the base of the legume. 



The corolla is pale purple, but may van' to pure white. 

 The estivation is that of a typical member of the Papilio- 



naceaj. 



The anterior margins of the carina cohere but for a short 

 distance. The upper portion of each is shaped like a 

 rounded triangle, and narrows abruptly into a long slender 

 claw. In the inferior region of the triangle occurs a marked 

 depression. The alee are rather oblong in the upper por- 

 tion, otherwise they resemble the carinal members in 

 creneral outline. In each of these is seen an invagination 

 pointing posteriorly; the floral parts are so arranged that 

 the pouches thus formed upon carina and alae inter-digitate, 



