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) 
glauca 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 seedlings. 
and in Centranthus macrosiphon I found 37% of them 
amongst the seeds of a single syncotylous plant. 1 
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- 
1 Eine Methode, Zwangsdrehungen aufzusuchen, Ber. d. d. bot. 
Ges., Vol. XII, 1894, P- 25. 
