29 
was suggested to Professor S. M. Tracy that he visit the original 
na on the Alabama river, above the old fort at Tensaw. 
his was done with the result that the plant in question, which 
proves to be Onagra grandiflora (Ait.) Vail was found. Although 
it has been in cultivation since 1776, its place in the American 
flora was uncertain. 
e@ common evening primrose (Oxagra diennis) has been 
found to consist of a number of clearly separated elementary 
Fic. arck’s evening- Laelia ( Onayra aia the parental form 
which has given rise to about 14 mutants, or sports in the last few years, ne of 
these, O. zanel/a, is shown on ite right and {s always m each ae than the parental 
form. (By permission of the Carnegie Institution. ) 
species which apparently do not intercross. The failure to dis- 
criminate among these forms has resulted in the currently ac- 
cepted conclusion that this species is subject to unusually wide 
fluctuations. a matter of fact none of the forms included in 
the species eynibi anything but the ordinary amplitude of varia- 
