No. 443] • MUTATION IN PLANTS. 763 



leaves of the rosette in the period immediately preceding flower- 

 ing were petiolate with the apices bluntly pointed and with broad 

 laminiE. TIk- margins of all of the earlier leaves were sparingly 

 but sharply toothed. 



Plants set out early in May were blooming profusely early in 

 August. The basal branches coming out from the axils in or 

 near the rosettes were strong and vigorous but the upper branches 

 of the stem were short and offered a distinct contrast to the 

 longer, more slender branches of iiibiincnns, with which it was 

 also contrasted by its denser foliage and larger more showy 

 flowers. Both stems and branches were thicker and heavier 

 than in rubrincrvis. 



After noting the great variance in behavior and appearance of 

 the parent and two mutants as described above, mature plants in 

 bloom, the dried material of the younger plants, and photographs 

 were submitted to Dr. J. K. Small, who had previously published 

 an arrangement of the American species, and who is familiar 

 with them in (Small, J. K. CEnothera and its Segregates. Bull. 

 Torr. Bot. Club. 23: 167-194, 1896.) the herbarium and in 

 the field. Dr. Small has kindly prepared the following statement 

 concerning three forms, which is given in full below : 



The characteristics of Qinothcra lamarckiana and (2t. nibri- 

 nervis as given by Dr. Small are set in parallel columns for con- 

 venience of comparison : 



