654 
Geological Periods of Mutation. 
l.O 
Fig. 148. Pedigree of Oenothera Lamarckiana, exhibiting 
the yearly origin of new species in my experimental 
garden in the years 1889-1899. g, O. gigas; a, O. albida; 
It, O. lata; n, O. nanella; r, O. rubrinervis ; o, O. oblonga; 
s, O. scintillans. The numbers preceding the letters are 
those in which the species in question arose. The num- 
bers on the main stern show the extent of the yearly cul- 
tures. 
