184 



MISSOURI BOTANICAL GAEDEN 



LITERATURE CITED. 



1869. Masters, Maxwell, T. Vegetable Teratology. London. 



1890. Penzig, O. Pflanzen-Teratologie. Genua. 



1907. Shull, Geo. H. In Mutations, variations and relationships of 



the Oenotheras, by MacDougal, Vail and Shull. Carnegie 



Institution Pub. No. 81. Washington. 

 1909. Baur, E. Das Wesen und die Erblichkeitsverhaltnisse der 



M Varietates Albomarginatae Hort. " von Pelargonium zonale. 

 Zeitschr. f. ind. Abst.- u. Vererbungslehre 1:330-351. 



1909. DeVries, Hugo. The Mutation Theory. Translated by J. B. 



farmer and A. D. Darbishire. Vol. I. Chicago. 



1910. Gates, R. R. The material basis of Mendelian phenomena. 



Amer. Naturalist 44:203-213. 



EXPLANATION OF PLATES. 



Plate 29. — PUnt belonging to a race known as Oenothera multiflora, 

 originally derived from the English coast near Liverpool. All but the 

 earliest flowers are virescent or f rondescent. 



Plate 30. — 1, Virescent buds photographed natural size, showing the 

 peculiar baggy appearance of the calyx. 2, Virescent buds natural 

 size, opened to show the small petals, tapering pubescent style and 

 (buds on the left) leaves growing out from the interior. 



Plate 31. — Sectorial chimera, in which the leaves on one side of the 

 rosette are lacking in chloroplasts. In certain cases half the leaf is 

 white and half green. 



