280 Shull. 



from the calyx-tube. The petals were of the usual type, broad, with an 

 apical cleft about one-third their length; stigmas long and very slender, 

 exserted from the corolla about 5 mm. (In typical M. album they are 

 usually included or nearly so, while in M. rubrum they are exserted). 

 Capsules narrowly conical, slender. Another remarkable feature was 

 the apparent absence of the absciss-layer, which, in most other strains 

 of Lychnis dioica, and especially in Melandrium album, causes the buds 

 and flowers to drop off or to be broken off readily. In Figure 4 this 



Fig. 5. Narrow-leafed female No. 12210(2). Numbered divisions on the rule 

 are inches (1 inch = 2'5 cm). 



plant is shown in comparison with one of its narrow-leafed male sibs. 

 See also Fig. 5. 



That this peculiar plant represents a mutation of some sort, there 

 can be little doubt, but its genotypic relationship with its sibs can not be 

 surmised. It may have been a sex-mutant from a narrow-leafed male 

 or a leaf-mutant from a heterozygous broad-leafed female, or something 

 independent of both. Whether its characters are those which will be 

 found in narrow-leafed females, when the latter are produced by normal 

 segregation and recombination, as I have no doubt they will be in 

 some future mating between heterozygous broad (X narrow)-leafed females 



