No. 539] ORIGIN OF SPECIES IN NATURE 



653 



our selections of these white-flowered forms now breed 

 true." 



In connection with this alba form I wish to call atten- 

 tion to the local distribution of a white-flowered form 

 of Solanum Dulcamara, lately taken into cultivation in 

 the experiment garden. This variety occurs but rarely 



in the vicinity of Ann Arbor, chiefly on river and lake 

 shores and in swampy places. But at Albion, Mich., it 

 was found in great abundance, growing in moist situa- 

 tions alongside of the species. While it will take some 

 years to determine the constancy of this variety there 

 is in my mind no question as to the outcome o ^ .ie ex- 

 periment. It is a variety not alwa>> iec<>uni/<< n <> ^ 

 floras, though evidently met with from tunc to time. 

 But if we give specific rank to mere eolo r % -anetm^as 

 we do in the case of Datura Tatuta and Datura > > ■>>,, .,- 

 nium, why not give taxonomic recognition to the equna- 



