298 THE JOURNAL OF BOTANY 



S. viminalis with triandra, purpurea, Caprea, aurita, cinerea, 

 and repens. 



S. Lapponum with Caprea, aurita, c inertia, phylicifolia, Arbuscula, 

 repens, lanata, Myrsinites, and herbacea. 



S. Caprea with viminalis, Lapponum, aurita, cinerea, phylicifolia, 

 nigricans, repens, and Myrsinites. 



S. aurita with purpurea, viminalis, Lapponum, Caprea, cinerea, 

 nigricans, phylicifolia, repens, Myrsinites, and herbacea. 



S. cinerea with purpurea, viminalis, Lapponum, Caprea, aurita, 

 nigricans, phylicifolia, and repens. fc 



S. nigricans with Caprea, aurita, cinerea, phylicifolia, Arbuscida, 

 Myrsinites, and herbacea. 



S. phylicifolia with purpurea, Lapponum, Caprea, aurita, cinerea, 

 repens, Arbuscula, Myrsinites, and herbacea. 



S. Arbuscula with Lapponum, nigricans, phylicifolia, and herbacea. 



S. repens with purpurea, viminalis, Lapponum, Caprea, aurita, 

 cinerea, phylicifolia, and herbacea. 



S. lanata with Lapponum, herbacea, and reticulata. 



S. Myrsinites with Lapponum, Caprea, aurita, nigricans, phylici- 

 folia, and herbacea. 



S. herbacea with Lapponum, aurita, nigricans (?), phylicifolia, 

 Arbuscula, repens, lanata, Myrsinites, and reticulata. 



S. reticulata with lanata and herbacea. 



Besides, a few triple hybrids have been noticed, such as S. pur- 

 purea x aurita x phylicifolia (S. sesquitertia B. White), S. lutescms 

 X nigricans, and S. aunta x cinerea x repens, which Mr. Marshall 



has recently reported to me. The hybrids in this genus are fertile, 

 and have been crossed with one another for the sake of experi- 

 ment. In this way Max Wichura blended six strains of willow 

 in one. 



Populus canescens Sm. has been reckoned a hybrid, and is given 

 in De Candolle's Prodromus as very probably produced by P. alba 

 X P. tremula. 



Orchidace.e appear to resemble Salices in their great freedom 

 of intercrossing, and in the fertility of the hybrids. Mr. F. J. 

 Hanbury tells me that in the cultivated species many of the hybrids 

 are just as fertile as the original species. All do not equally well 

 produce good pollen-masses, but many hybrids will cross with other 

 hybrids, so that you may have four or more species blended in one. 

 I have no evidence to show that British hybrids are fertile ; as a 

 rule they have only been found very sparsely, and the natural 

 inference would be that they do not reproduce themselves. — Epi- 

 pactis atrorubens x latifolia, one plant on limestone near Tongue, 

 W. Sutherland, 1900, with the parents, E. S. Marshall ; not rare 



according to Focke, in Europe, where the parents grow together 

 (Germany, Russia). — Orchis incamata x latifolia, Mr. Marshall 

 believes, is recorded from Sussex ; and it occurs in the Avon Valley 

 near Christchurch, where both species are rather abundant, and 

 some plants intermediate. — O. latifolia x maculata occurs. I have 

 gathered it near Odiham and near Milford in Hants. — 0. latifolia 

 X ericetorum grows in a wet meadow in Edmondsham, Dorset. 



