33 



PLANT-BREEDING 



make it flower and produce seeds in its first year. Ordina- 

 rily at least one half of the plants remain in the rosette stage, 

 the remainder producing their stems only late in summer 

 or towards the fall, and thus having hardly time enough to 

 display their flowers, and none at all to ripen their fruits. 



Fig. 105. A. A rosette of rootleaves of Lamarck's Evening Primrose 

 in September. B. A similar rosette of one of its mutants {Oen. scintillans) 

 in the same age. 



Only in some very favorable years have I succeeded in saving 

 seed from annual gigas plants. 



Here we have an instance of correlation such as that 

 between hairiness or form of scales and hardiness in winter 

 or resistance to diseases. But here the mutative origin of 

 the type affords a direct proof of the validity of our assump- 

 tion that such divergent quahties may be the effects of the 

 same internal unit-characters. 



