No. 568] X CAPSELLA BURt 



AST OH is A U AC IIS OWE A 203 



shallow, reaching a depth of three-fourths of the width of 

 the leaf from margin to midrib in the eighth, ninth or 

 tenth leaf. However, once the indentations have made 

 their appearance, the leaf next produced ordinarily shows 

 two sinuses on both sides of the blade, usually the upper 

 set, rarely the lower, being the deeper of the two, and 

 almost reaching the midrib. The succeeding leaves show 

 an increase in the number of lateral lobes from two to 

 six. Since the incisions almost, if not quite, reach the 

 midrib, both lateral lobes and the terminal lobes are well 

 defined. Upon the lateral lobes secondary lobes appear, 

 both on the distal and proximal margins. It is to be 

 noted that only the climax leaves of well-grown specimens 

 of the homozygotic form distinctly show the lobing of the 

 proximal margin and this only on the middle lobes. The 

 lobing of the primary lobes results in the setting off of 

 a small terminal portion of each lateral lobe, which 

 possesses a more or less rhomboidal form. This terminal 

 lobe of the primary lobe can be observed to advantage 

 only in the climax leaves of well-developed specimens. 



broad, thus contrasting sharply with the plants to be de- 

 scribed under types 3 and 4, which constitute the " nar- 

 row" group. 



II. The "Narrow" Group.— In the plants belonging 

 here, the first five or six leaves possess a blade which is 

 from 2| to 3 times as long as broad. Usually after the 

 appearance of the seventh leaf, sometimes not until the 

 appearance of the tenth leaf, it is possible, on the basis of 

 marginal indentation, to separate the plants with " nar- 

 row" roset-leaves into two groups, designated respec- 

 tively types 3 and 4. 



Type 3.-Rosets of plants belonging to type 3 can not 

 be distinguished from those of type 4, until after the 



