458 Syncotylous Races. 



species, however, produced them more abundantly. Among 

 these were the following which produced the proportions 

 of syncotyls from the seeds of single individuals, indi- 

 cated by the attached figures: Oenothera (Kneiffia) 

 glaiica 16% (Figs. 89 and 90), Picris hieracioides 8%, 

 Valeriana alba 3%. Dahlia variabilis and Sycios angu- 

 lata were also found to be rich in syncotylous seedlings, 



Fig. 89. Oenothera glauca. A plant which produces an 

 abundance of syncotylous seedHngs. 



and in Centranfhus inacrosiphon I found 37% of them 

 amongst the seeds of a single syncotylous plant. -^ 



By syncotyls we mean, in the strict sense of the term, 

 those individuals whose seed-leaves are completely, or 

 almost completely, fused together along one side. Smaller 

 degrees of fusion are called hemi-syncotyls, and they 

 constitute an uninterrupted series between normal di- 



^ Eine Methode, Zwangsdrehungen aufzusuchen, Ber. d. d. hot. 

 Ges., Vol. XII, 1894, P- 25. 



