530 Mutations 



not fall off after the fading away of the 

 flower, as unfertilized ovaries usually do; 

 neither does it grow out, nor assume the upright 

 position of normal capsules. It is checked in its 

 development, and at the time of ripening it is 

 nearly of the same length as in the beginning. 

 Many of them contain no good seeds at all ; from 

 others I have succeeded in saving only a hun- 

 dred seeds from thousands of capsules. 



These seeds, if purely pollinated, and with 

 the exclusion of the visits of insects, reproduce 

 the variety entirely and without any reversion 

 to the lamarckiana type. 



Correlated with the detailed structures is the 

 form of the flower-buds. They lack the high 

 stigma placed above the anthers, which in the 

 lamarckiana, by the vigorous growth of the 

 , style, extends the calyx and renders the flower- 

 bud thinner and more slender. Those of the 

 hrevistylis are therefore broader and more 

 swollen. It is quite easy to distinguish the in- 

 dividuals by this striking character alone, al- 

 though it differs from the parent in other par- 

 ticulars. 



The leaves of the 0. hrevistylis are more 

 rounded at the tip, but the difference is only pro- 

 nounced at times, slightly in the adult rosettes, 

 but more clearly on the growing summits of the 

 stems and branches. By this character, the plants 



