New Species of Oenothera 541 



which was found more than once in the field, and 

 recently (1902) in a luxuriant flowering speci- 

 men. It has likewise been raised from seeds 

 collected in different years at the original sta- 

 tion. It is also wholly pistillate. AxDparently the 

 anthers are robust, but they are dry, wrinkled 

 and nearly devoid of contents. The inner wall 

 of cells around the groups of pollen grow out 

 instead of being resorbed, partly filling the 

 cavity which is left free by the miscarriage of 

 the pollen-grains. This miscarriage does not 

 affect all the grains in the same degree, and 

 under the microscope a few of them with an ap- 

 parently normal structure may be seen. But the 

 contents are not normally developed, and I have 

 tried in vain to obtain fertilization with a large 

 number of flowers. Only by cross-fertilization 

 does 0. lata produce seeds, and then as freely as 

 the other species when self-fertilized. Of course 

 its chance of ever founding a wild type is pre- 

 cluded by this defect. 



0. lata is a low plant, with a limp stem, bent 

 tips and branches, all very brittle, but with 

 dense foliage and luxuriant growth. It has 

 bright yellow flowers and thick flower-buds. 

 But for an unknown reason the petals are apt to 

 unfold only partially and to remain wrinkled 

 throughout the flowering time. The stigmas 

 are slightly divergent from the normal type, 



