1912] Setchell: Studies in Nicotiana 15 



Nicotiana rustica var. texana 



1 7 



U. C. B. G. 07. — Nicotiana rustica var. texana (Naud.) Comes, 

 as interpreted by Comes, is shown in plate 14, representing a 

 plant from pedigreed seed kindly sent by Professor Comes in 

 1907. It is a coarse plant, next lowest in stature to var. humilis, 

 to which it approaches more nearly than it does to other varieties 

 of N. rustica. Its habit is looser, as to the panicle, and the leaves 

 are more rounded at the base. The flowers are more slender 

 than those of N. humilis. On the whole, however, the two 

 varieties are very close to one another, (cf. plate 14). 



Considering all the varieties and forms of Nicotiana rustica 

 which I have been able to obtain and cause to grow in the 

 U. C. B. G., the varieties brasilia and scabra are the most dis- 

 tinct, yet all have more or less definite points of distinction. 

 Most of the plants of this species from other sources which have 

 been grown may be referred more or less definitely to one or 

 other of the six varieties enumerated above or seem to be inter- 

 mediate between some two of them. One other stock, besides 



169 

 those mentioned above has been retained, viz., U. C. B. G. 08. 



Nicotiana rustica var. pumila ? 



169 



U. C. B. G. 08. — This is referred with doubt to Nicotiana 

 rustica var. pumila Schrank (1807, p. 264) and is represented 

 in the photographs reproduced in plates 15 and 16. This plant 

 is the lowest of all the members of the N. rustica assemblage 

 which have come under my observation. It is 12 to 14 inches 

 high, matures early, and is loose in habit. Its leaves are ovate- 

 lanceolate and unequal at the base. They are small compared 

 with those of the other varieties of N. rustica. For three seasons, 

 bred in the pure line, it has retained its lowly habit, earliest 

 flowering of all the varieties of N. rustica, and its narrow leaves. 



Nicotiana Langsdorffii Weinm. 



This species was described by Weinmann (p. 323) and by 

 Schrank (pi. 72) in 1819 as coming from Brazil and was intro- 



