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THE AMERICAN NATURALIST [Vol. XLV 



will thus account for much species formation, and for the 

 polymorphism of many genera. That it will account for 

 the larger evolutionary trends and for many adaptations, 

 remains to be shown. 



St. Louis, Mo. 



LITERATUKE CITED 



Cook, O. F. '07. Aspects of Kinetic Evolution. Proc. Washington Acad. 

 Davis, B. M.' '10. Notes on the Behavior of Certain Hybrids of (Enothera 



and Darbishire. Chicago and London. 1909. 

 Gates, R. R. '08. A Study of Reduction in (Enothera rubrinervis. Bot. 



'09a. An Analytical Key to some of the Segregates of (Enothera. 20th 



Rept. Mo. Bot. Garden, 123-137. 

 '09b. The Stature and Chromosomes of (Enothera gigas de Vries. Arch. 



'09c. Further Studies of (Enotheran Cytology. Science, 29: 269. 

 '10. The Earliest Description of (Enothera Lamarckiana, Science, 31: 

 425-426. 



'11a. Early Historic, botanical Records of the Oenotheras. Proc. Iowa 

 Acad. Science, 1910: 85-124, Pis. 6. 



(Enothera. Zntschr. /'. i„<l. Ahst.- „„,! V , n ,1m „ „*b hrv, 4: 337-372. 

 Figs. 5. PI. 6. 



'11c. Pollen Formation in (Enothera gigas. Annals of Botany, 25: 

 Hill, E. J. '11. (Enothera Lamarckiana: its Early Cultivation and De- 

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 MaeDougal, D. T. '03. Mutation in Plants. Amer. Nat., 37: 737-770, 

 Figs. 10. 



