Examples of Constant Races. 



87 



vulgaris tvicalcarca,^ of many glabrous forms like Lych- 

 nis z'cspcrtina glabra, of thornless types like Datura Stra- 

 monium incrmis- etc., all of which I have tested per- 

 sonally. Space docs not permit of the compilation here 

 of anything like a complete list of constant varieties. 



Fig. 12. Mclilotus coenilea monophyUa. Eacli leaf consists 

 of a single blade but is more or less deeply incised. One 

 of the lateral leaflets in the middle leaf on the right of 

 the figure appears to be quite free. A, a bract from the 

 inflorescence; here the leaves are least incised. 



^ J. H. Wakker, Linaria vulgaris, Nederl. Kruidk. Archief, 1889, 

 with plate X. 



"See Fig. 5 on page 31 of Vol. I. 



