760 



THE AMERICAN NATURALIST. [Vol. XXXVII. 



young plants, indicative of high turgidity and weak development 

 of mechanical and supporting tissues. Both of these characters 

 have been observed by deVries, who notes that the bundles of 



Fig. 7. — Oenothera lamarckiana. Adult plant two weeks after beginning of opening of flow- 

 ers. Photograph of living plant grown in the soil in the open air, and temporarily fixed 

 in a pot. (See Fig. 8.) 



bast fibers of the flowering stems were composed of elements 

 with thinner walls than those of the parent type. 



The leaves of the full rosettes, were silvery white owing to 



