620 



Su John Luhhoch 



[Feb. 18, 



produces a little ])od. This would in the present species be useless, 

 or even injurious ; many young plants growing in one place would 

 jostle and starve one another. Hence we see another obvious 

 advantage in the fact that only a few florets perfect their seeds. 



I have already alluded to our Cardamines, the pods of which open 

 elastically and throw their seeds some distance. A Brazilian species, 

 C. chenopodifolia, Fig. 17, besides the usual long pods, Fig. 17 a a, 



Cardamine chenopodifolia. 

 a a, ordinary pods ; h, subterranean pods. 



1 \ 



produces also short pointed ones, Fig. 17 6 6, which it buries in the 

 ground. 



Arachis hypogcea is the ground-nut of the West Indies. The 

 flower is yellow and resembles that of a pea, but has an elongated 



