Oenothera 



Onagraceae 



705 



o 50 

 Map 1484 

 Oenothera pycnocarpa 

 Atkinson & Bartlett 



~Tu 



Map 1485 



Oenothera nutans Atkinson & Bartlett 



50 



Map I486 



Oenothera canovirens Steele 



weeds. Each plant bears a great number of seed and self-sown seedlings 

 will appear many years afterward. The status of this and the next three 

 species is not yet definitely determined. Some authors regard them simply 

 as varieties of Oenothera biennis but I am regarding them as species as did 

 the authors who described them. The plants are exceedingly variable and 

 only an expert can name them with any degree of certainty. I have a 

 large number of specimens which I am not including in this treatment 

 because I can not satisfactorily name them. 

 N. E. to Minn, and southw. 



2. Oenothera nutans Atkinson & Bartlett. (Rhodora 15: 83. 1913.) 



Map 1485. This form is less common than the preceding one as is shown 

 by the map. The plants have the same habitats as those of the preceding. 

 Widely distributed in e. N. A. 



3. Oenothera canovirens Steele. (Contr. U. S. Nation. Herb. 13: 365. 

 1911.) Map 1486. This is the form that has been regarded as Oenothera 

 strigosa (Rydb.) Mack. & Bush. It is more common than the preceding 

 species and has the same habitats. Probably widely distributed in eastern 

 N. A. 



4. Oenothera cymatilis Bartlett. (Cybele Columbiana, p. 51, 1914.) 

 Our only specimen of this species was collected by the late Carl Buhl in 

 an old tamarack bog about 7 miles west of La Porte, La Porte County. 

 Since it is reported from both Illinois and Michigan, it is doubtless more 

 or less frequent in the dune area. 



5. Oenothera rhombipetala Nutt. (Raimannia rhombipetala (Nutt.) 

 Rose.) Map 1487. In very sandy soil along roadsides and in fallow fields 

 and in the dune area in open woodland, along roadsides, and in waste 

 places, becoming plentiful where conditions permit it to spread. 



Ind. to Minn., southw. to Tex. 



