WALDRON— THE PEANUT 313 



Variety — North Carolina, Florida Runner, African, Wilmington, etc. 



Rank growing plants with dark green massive foliage. Pods not 

 clinging well, medium sized, containing two, sometimes three, mod- 

 erate-sized seeds with reddish testas. 



Variety — Virgin ia Ru n n er 



Similar to the North Carolina, but with much larger pods and 

 seeds. 



Variety — Virgin ia Bunch 



Plants semi-erect with light foliage, often appearing among plants 

 in fields of the Runner type. Pods large, adhering well to the plant, 

 bright, clean, with two, sometimes three, seeds covered by light 

 brown coats. 



Variety — Jumbo 



The same as, or possibly sometimes a strain of, the Virginia Run- 

 ner or Virginia Bunch varieties. 



Histology 



Root 



The internal structure of the root of Arachis is of the normal di- 

 cotyledonous type. The epidermal relation, however, of young roots 

 and the production of root hairs is quite striking. It has been re- 

 ported by Pettit and Richter^'^ that no hairs are produced on the 

 plant. The author, however, found them on all plants examined 

 but usually in different position from the normally produced tip 

 hairs. Although the tip hairs were found, they were rare and appear- 

 ed only on young vigorous plants. Usually they are present in the 

 form of rosettes on and at the base of newly formed side roots. As 

 seen in Plate LXXIX, Fig. 4, those produced nearest the base are 

 comparatively long, but are gradually reduced in length until none 

 appear. Aside from the position relation, these rosette hairs are of 

 the normal root-tip hair structure. The tip hairs when present are 

 usually rather short and scattered, occurring on young delicate, usu- 

 ally few-branched, roots. No hairs of either type have been ob- 

 served on the main root either during germination or later. 



Young elongating roots of the plant which bear no root hairs often 

 have their cuticle mucilaginized causing the soil particles to adhere 

 as if hairs are present. These roots are often very white, delicate 



