1917J Goodspeed-Clausen: F^ Species Hybrids i)i Nicotiaiia 319 



N. suaveolens X N. macrophylla is reported to be so much like 

 macrophylla that the characters of suaveolens cannot be detected in 

 the hybrid (Gartner, p. 256). It is a vigorous form (p. 527), and 

 possesses extraordinary powers of vegetative reproduction (p. 297), 

 It is also notable for its prolonged period of life (p. 547). 



N. quadrivalvis X A^ Tabacum is reported to be decidedly like 

 the male parent (Gartner, p. 471). On page 401, Gartner includes 

 macrophylla X quadrivalvis among infertile hybrids resembling the 

 female parent. Satisfactory conclusions cannot, however, be drawn 

 from the meager statements concerning the characters of these hybrids. 



N. quadrivalvis X glutinosa is listed by Gartner on one page (p. 

 286) among patroclinous hybrids, and on the next page among those 

 which are decidedly matroclinous. Focke (1881) has pointed out a 

 number of inconsistencies in the descriptions of this hybrid and its 

 reciprocal. It is apparently absolutely sterile (pp. 401, 533), although 

 the blossoms are held for some time when pollinated with pollen from 

 the parent forms. On page 559 its dwarf habit is described. The 

 reciprocal cross, glutinosa X quadrivalvis, is included among those 

 which are prevailingly patroclinous in type, and there is another note 

 as to its patroclinous character on page 257. As with quadrivalvis X 

 glutinosa, the blossoms are abscissed a few days after opening (p. 

 343). It is a dwarfed and stunted form. 



N. rustica X N. quadrivalvis gives a hybi'id resembling the male 

 parent (Gartner, p. 222), but not so strikingly as do some other 

 hybrids (pp. 256, 284). It occasionally sets small, shrunken fruits 

 (p. 367) which appear toward the end of the blooming period and 

 contain a few seeds (p. 393). The hybrid is difficult to obtain (p. 109) 

 and the reciprocal apparently cannot be produced. 



N. quadrivalvis X N. vincaeflora gives a hybrid in which the type 

 of quadrivalvis is distinctly discernible (Gartner, p. 256). On page 

 222, vincaeflora X quadrivalvis is listed among patroclinous hybrids, 

 and statements as to its patroclinous nature are repeated at other 

 places (pp. 267, 286, 290, 471). The hybrid is totally sterile. 



N. suaveolens X N. glutinosa is stated to be of the paternal type 

 (p. 267), but it has much enlarged flowers (p. 296). The blossoms 

 are apparently as deeply colored as those of glutinosa itself (p. 301), 

 but still present differences in form and color from those of the parents 

 (pp. 318, 641). On page 404, botli lliis cross and its reciprocal are 

 listed among infertile hybrids intermediate in characteristics between 

 the two parents. 



