266 



BOTAXICAL GAZETTE 



LamarcMana in 1913, and got from the seeds a uniform generation 

 of 60 flowering individuals, all of which proved to be Lamarckiana. 

 I conclude from this fact that the pollen of the pallesceiis 

 plants does not transmit the characters of the race, exactly 

 as in 0. scintillans and O. caiia. 



0. Lamarckiana lata mut. Lactuca (tig. 5, C).— In the summer 

 of 1Q13 I found, in a race of 0. lata which had been fertilized in the 



previous generations (1905 

 and 1907) by 0. Lamarck- 

 iana, a weak plant which 

 seemed to be new to me, 

 but showed evident signs 

 of affinity with the incon- 

 stant types of 0. cana and 

 0. pallescens as previously 

 described. It was fertil- 

 ized, therefore, purely by 

 its own pollen. It yielded 

 0.8 cc. of seeds, which 

 were sown in 19 14 and 

 gave rise to 65 plants, one 

 of which was a mutant of 

 the ordinary tj-pe of 0. 

 nanella, and subjected to 

 the same bacterial disease 

 which so often deforms the 

 dwarfs of my race. Among 

 the others, two types were represented in about equal numbers. One 

 type was exactly hke normal Lamarckiana; it counted 36 individuals, 

 almost all of which have flowered, without showing any recognizable 

 diflerence from the original wild species. The remaining 28 con- 

 stituted a new and uniform t}pe, repeating the characters of the 

 parent plant of 1913, so far as these had been noticed and recorded. 

 At the time of planting out, in the beginning of May, they very much 

 resembled the compact rosettes of 0. nanella, but without any signs 

 of the disease. About the middle of June, when the rosettes of 

 the tj-pe of Lamarckiana were growing very fast, those of the new 



Fig. 5. — Tj-pical radical leaves of A, Oeno- 

 thera Lamarckiana mut. Uqiiida; B, mut. cana; 

 C, mut. Lactuca; June 1914. 



