MUTANTS AND HYBRIDS OF THE OENOTHERAS. IO, 



nearly conforming to normal types in a manner comparable to that of 

 the parent, as noted above. These leaves were ovate- denticulate, 

 abruptly acute, slightly crinkled, and were minutely pubescent. The 

 terminal rosettes were dense and symmetrical and flower-buds were 

 developed, the first of which opened on August 12. About this time 

 some large rosettes were formed from lateral buds near the bases of 

 the stems, which were composed of oblong-lanceolate leaves, slightly 

 crinkled and denticulate and tapering to both ends. The entire 

 plant was tinged with red, and most deeply so in the upper branches. 

 (PL XVII, fig. 4O 



The petals were deeply emarginate, 28 to 30 mm. long and 30 to 

 35 mm. wide, being broader than long in all instances. The segments 

 of the calyx were 30 mm. in length, being less than half the length of 

 the hypanthium, which measured about 38 mm. The ovary was 10 

 mm. long and, with the hypanthium, bore a number of scattered hairs. 

 Perhaps the most noticeable feature of this type was the variability of 

 the relative length of the stamens and pistils. The pistils were fairly 

 constant in length, but in some flowers the stamens were shorter and 

 therefore not adapted to self-fertilization, while in others the anthers 

 were above the stigmas, thus insuring self-pollination. No correlated 

 structures were observed. 



The capsules were about 2 cm. long, 5 to 6 mm. wide below the 

 middle, oblong, tapering from near the base, obscurely angled and 

 channeled, sparingly pubescent with both long and short scattered 

 hairs. 



The exceptional, forms of leaves exhibited by this type were found 

 to be accompanied and probably caused by the presence of a fungus, 

 which seemed to attack this type only of the hybrid progeny. Similar 

 effects in 0. lamarckiana have not yet come under observation, but 

 young rosettes of 0. biennis, together with mature plants coming into 

 bloom, were found growing wild in some waste park-land near the New 

 York Botanical Garden on August 21 , 1904. The leaves of these plants 

 were closely similar to those of the pathological hybrid individual in 

 general appearance, and furnished the curious parallel of showing 

 a partial return to the normal form near the upper ends of the branches. 

 Rosettes of the type described were transplanted to pots in the experi- 

 mental house and the terminal portions of the leaves cut away in 

 accordance with garden practice. Within a few days several leaves 

 were seen to show an abundance of yellowish spermagonia, which 

 appeared to belong to Aecidium peckii De Toni, although aecidia were 

 not found. 



