MASS. EXPERIMENT STATION BULLETIN 431 



1. CABOT — narrow 



2. GROVER — medium 



3. JERSEY — wide 



Figure 3. Leaf Apex and Base Angles 



4. NO. 73 — narrow 



5. WAREHAM — medium 



6. PIONEER — wide 



7. JERSEY — very wide 



saucer (Figure 4). In others the curving is toward the top of the leaf producing 

 saucer-folding as in Katherine. When the folding is more pronounced and nearer 

 the midrib, a U-fold results as in Pioneer. If the folding is still more abrupt 

 and occurs at the mid-rib, the V-fold of June results. 



Wavi7tg of the leaf margin is another useful character. Some varieties have 

 an unwaved or even margin like Rubel (Figure 5). Others have a distinctly 

 waved margin such as Rancocas. Atlantic has a hoisted midrib which produces 

 an effect something like waving but distinct from it. 



There are four kinds ol curvature of the midrib. Some ha\e a double curve 

 like a broad-flat letter S; that is, a reverse curve as in Pioneer (Figure 6). Some 



^^^ ^-^ 



Figure 4. 



1. SAM — reverse saucer-folded 



2. KATHERINE — saucer-folded 



Leaf Folding. 



3. JUNE — V-folded 



4. PIONEER — U-folded 



