SPECIES CROSSES IN THE GENUS NICOTIANA. 199 



Vol. XIII. (Paris, 1852). It is unfortunate that the publication 

 of Gaertner's work preceded that of the Prodromus, since, 

 owing to Gaertner's omission of references to the authorities 

 for specific names employed in the "Bastarderzeugung," there 

 is a doubt as to the identity of some of tt he forms which he 

 made use of. 



Nicotiana is not an easy genus for the identification of 

 species from pubUshed descriptions, and very little help was 

 obtamed from the collections at Kew and the British Museum, 

 both of which are far from complete. The terminology 

 employed by many of the chief European Botanic Gardens, 

 from which seed was very kindly obtained for me by Mr. 

 R. I. Lynch, appeared to be largely fortuitous.* 



Some of the plants obtained in this way under the names of 

 particular species turned out to be themselves crosses. 



The following is a list of the tj^es employed by me as the 

 parents of crosses —-so far as tliey have been identified : — 



Section Tabacum. 



Nicotiana tabacum, var. fruticosa, Hook. f. 



var. raacrophylla, Schrank. 



var. calycina, Hort. 



Section Rustica. 



Nicotiana rustica var. humilis, Schi-ank. 



var. scabra. Comes. 



paniculata, L. 



glauca, Grah. 



glutinosa, L. 



langsdorfii, Weimn. 



— var. grandiflora, Comes (N. comrnutata, 



Section Petunioides. 



Nicotiana sylvestris, Speg. and Comes. 



alata, Lk. 



var. grandiflora. Comes. 



acuminata, Grah. 



var. grandiflora, Comes. 



longiflora, Cav. 



var. acutifolia, St. HiU. 



plumbaginifolia, Viv. 



viscosa. Lehm. 



forgetiana, Hort. Sand. 



* It is therefore uuly proper to mention tluit all the varieties obtained 

 from the garden at Upsala were correctly named so far as I am able 

 to judge. 



