542 Mutations 



also being partly united with one another, and 

 laterally with the summit of the style, but with- 

 out detriment to their function. 



Young seedlings of lata may be recognized by 

 the very first leaves. They have a nearly or- 

 bicular shape and are very sharply set off 

 against their stalk. The surface is very un- 

 even, with convexities and concavities on both 

 sides. This difference is lessened in the later 

 leaves, but remains visible throughout the whole 

 life of the plant, even during the flowering sea- 

 son. Broad, sinuate leaves with rounded tips 

 are a sure mark of 0. lata. On the summits of 

 the stems and branches they are crowded so as 

 to form rosettes. 



Concerning inheritance of these characteris- 

 tics nothing can be directly asserted because of 

 the lack of pollen. The new type can only be 

 perpetuated by crosses, either with the parent- 

 form or some other mutant. I have fertilized 

 it, as a rule, with Lamarckiana-'poWen, but have 

 often also used that from nanella and others. In 

 doing so, the lata repeats its character in part of 

 its offspring. This part seems to be independ- 

 ent of the nature of the pollen used, but is very 

 variable according to external circumstances. 

 On the average one-fourth of the offspring be- 

 come lata, the others assuming the type of the 

 pollen-parent, if this was a Lamarckiana or 



