A SECTORIAL CHIMERA 



Figure 21. A plant of the variety Tochigi 

 was found in which several leaves were half 

 green and half yellow. All these leaves were on 

 the same side of the stem. Normally the stem 

 has four ribs, as shown at II, Figure 22, but 

 in the region of the chimera, one of the ribs 

 was split and one half of the rib was green, the 

 other yellow. (See text, p. 283.) 



expect new forms to appear as a 

 result of inbreeding. A mutant form 

 was sent to the writer by Mr. L. H. 

 Dewey of the United States Depart- 

 ment of Agriculture and Professor 

 A. H. Wright of the University of 

 Wisconsin. This mutant is a simple 

 leafed form which appeared in a 

 strain of Ferramington. Instead of 

 having the normal digitate leaf usually 

 found in hemp, the mutant is charac- 

 terized by a palmately cleft leaf as 

 shown in Figure 20. The leaflets of the 

 normal digitate leaf appear to have 

 grown together as the normal number 



STEM OF THE CHIMERA 



Figure 22. a, d, beginning and end of 



grown togerner as tne iiui ma. nuxuuc ^j^j^j-^ ^j, ^ ^^'^^ ^^^ second chimera leaf; 



of midribs is present with an equal ^^ ^^^^^ ^^^^ ^^ ^jj^. f_ ^^Ho^ half of rib; II, 



number of lobes. There is usually an normal stem; III, stem'in region of chimera; 



unequal growth of tissue between the g, green rib; h, yellow rib 



