No. 592] HYBRIDS OF GEXUS Kl'lLOBll M 245 



North America and in England, the former section is rep- 

 resented only by E. angustifolium (L.), while the latter 

 includes numerous species. Moreover, although the 

 species of the Epilobium section are generally recog- 

 nized to hybridize freely with one another, they do not 

 hybridize with the Chamcdnerion section. Accordingly, 

 one would expect to find only good pollen in the anthers 

 of E. angustifolium, and a mixture of good and bad in 

 all the others. Investigation of the North American 

 forms showed that such was indeed the case, and photo- 

 micrographs illustrating these conditions were published. 2 

 When the writer came to examine English specimens, 

 however, a different state of affairs was discovered. 

 Abortive spores were found not only in E. montanum, E. 

 parriflovum and E. hirsutum, as might have been an- 



ticipated, but also in E. angustifolium. E. angustifolium 

 grows wild in only two localities in the vicinity of Cam- 

 bridge, Hardwick and Gamlingay, but in specimens from 



2 Loc. tit. 



