REPRODUCTION 



271 



orous. After fruiting, the whole branch usually dies to the 

 ground, and then the rosette from which it arose will give 

 rise to the lateral creeping branches by which new rosettes 

 will be formed. Thus non-sexual vegeta- 

 tive reproduction follows the sexual mode, 

 the same plant being capable of both but 

 not of both simultaneously. Before it has 

 flowered, however, a rosette is not likely 

 soon to branch and to form new rosettes. 

 If vigorous young plants which, under 

 ordinary conditions, would presently bloom 

 are so placed that they have only enough 

 light for active vegetation but otherwise 

 are very favorably situated, they will not 

 form the erect flower-bearing branches, but 

 will continue to grow and will presently 

 form creeping branches, spreading and 

 maintaining themselves in this way. Plants 

 may be kept from blooming by this means 



Fig. 23 Fig. 22 



Figures 22. 23. Mimnlus Tilingi. Figure 22, a blooming plant from 

 a cutting of the preceding year. Figure 23, a younger plant not yet 

 ready to bloom. (After Vochting). 



for an indefinite length of time. Vochting reports having 

 kept plants sterile for three years. The effect of such 

 enforced sterility on the health of the plants appears 

 to be neither favorable nor unfavorable. Under other- 

 wise like favorable conditions plants which have not flow- 

 ered present as vigorous an appearance as those which 



