Other Characters in Oenothera Lamarckiana. 479 



ficially fertilized such plants when it happened to be ne- 

 cessary to record the progeny of all the plants on the bed 

 on which it stood. Otherwise I have suppressed them, 

 so as not to load the cultures with plants of this incon- 

 venient form. 



Double rosettes of the sort figured have appeared al- 

 most every year since the beginning of my experiment 

 and very often in large numbers. I found most of them 

 in 0. Lamarckiana, but also in O. lata, O. nanella, 0. Jiir- 

 tella, etc. 



The second period of the life of the plant in which 

 fasciations are commonest occurs in autumn. If we 

 allow the main stem to go on flowering till autumn its 

 top often broadens out. 



But most of the plants in my cultures have stopped 

 flowering by that time. Those which have been recorded 

 and are not wanted for other reasons are weeded out, 

 seed plants are decapitated, and plants fertilized by in- 

 sects are so heavily laden with fruits that flowering ceases 

 of its own accord. But O. hrcvistylis is very suitable in 

 this respect, because it practically bears no fruit and sets 

 no seed; a character by which it is easily recognizable 

 even when flowering is over. I have often allowed a 

 whole bed of this species to go on flowering into Novem- 

 ber; with the result that the top of many of the plants 

 began to broaden out either in September or October, 

 and so quickly that, in a very few weeks, it attains a 

 breadth of 1-2 cm. The fan-shaped tops of the stems 

 were often as broad as they were long. As to their fre- 

 quency, I had, for example, in 1898, 20 fasciated indi- 

 viduals in a bed of 49 flowering plants of O. brez'isfylis: 

 that is about 40% ; and in another culture of the same 

 species 63 fasciated and 11 not; that is about 70%. 



