No. 568] X CAPSELLA BUBSA-PASTOR1S ARACHXOIDEA 205 



is a difference in the apex of the leaf, the apices of leaves 

 of this type, like those of type 3, being decidedly pointed, 

 while those of types 1 and 2 are rounded. 14 



At the sixth or seventh 

 leaf stage, the marginal 

 indentations make their 

 appearance, at first as 

 slight crenations, then as 

 long and shallow sinnses, 

 and finally, in the eighth 

 or ninth leaf, as a sinus 

 on one or both sides of 

 the midrib and about the 

 middle of the blade (Fig. 

 5). The lower margin of 

 the first sinus ordinarily 

 makes an angle of 45 

 degrees with the midrib, 

 while the upper margin 

 makes an angle of from 

 30 to 45 degrees with the 

 midrib. This renders the 

 first sinus ordinarily 

 greater than 90 degrees 

 (Fig. 7, a). The depth 

 of the first sinus is ap- 

 proximately one half the . a * . . limp**." 

 distance from margin to 



midrib. In subsequent leaves the depth increases, so that 

 in the 11th leaf the sinuses almost reach the midrib. In 

 Treleasi, one of the two forms, which together constitute 

 type 4, the climax leaves show incisions to the midrib, and 

 ' a well-marked terminal lobe, while in the other the sinuses 

 are less deep but the terminal lobe still is well marked 

 (Fig. 8). The number of sinuses increases in propor- 



1 It is to be i 



ves have sharply pointed lobes. What 

 lassed with them under rhomboidea, I 



