Amphicarpa <i monoica. 



A. Edgeivorthii is a Himalayan species, differing little in 

 appearance from . /. monoica. Concerning those found in 

 Mexico, nothing explicit could be learned. 



Sl'M.M \KV. 



1. A. monoica is strictly annual under ordinary condi- 

 tions. 



2. There are two types of seed, aerial and subterranean 

 The aerial may be divided into (a) those resulting from 

 purple flowers, (/>) and (//) from cleistogamic ones. 



3. Four distinct types of legume are developed (a) aerial, 

 green lanceolate acuminate pods, containing three to four 

 seeds; [&) aerial green oblong acuminate pods, containing 

 two to three seeds ; (of) aerial green, oblong pods, contain- 

 ing two seeds ; (c) subterranean purplish one-seeded ovate 

 pods. 



4. In weight the subterranean pods exceed the aerial in 

 the ratio of 40 to t. 



5. During winter a sharp dimorphism is noticeable in 

 the plants resulting from germination of subterranean 

 and aerial seeds. The form produced from the latter is a 

 low-growing non- twining plant, that from the former is a 

 tall vigorous twiner. During the summer, a dimorphism 

 still exists, but not in so marked a degree. The aerial 

 seed-plant is usually feebler in appearance, although it 

 twines. 



6. The normally hypogean cotyledons of all seeds, if 

 placed so that they are exposed to light, develop chlo- 

 rophyll. 



7. Injury to the main stein below the simple leaves when 

 a plant is young, causes cotyledonary shoots to develop. 

 These normally negatively heliotropic and non- twining 

 shoots become apogeotropic and twining. 



8. Cotyledonary axillary runners if allowed to develop 

 naturally, and then brought above ground, do not twine. 

 If the main stem is destroyed after these shoots have 

 reached a length of several inches, twining does not take 

 place. 



