706 



Onagraceae 



Oenothera 



o 5o 



Map 1487 



Oenothera rhombipetala Nutt. 



50 



Map 1488 



Oenothera laciniata Hill 



Map 1489 

 Oenothera pilosella Raf. 



6. Oenothera laciniata Hill. (Raimannia laciniata (Hill) Rose.) Map 

 1488. In sandy to very sandy soil along roadsides and in fallow fields. 

 We have one specimen from an open woods and one from hard, white clay 

 soil in a fallow field. It has already become a weed in some kinds of soils 

 and in time it will doubtless become a weed throughout the state. 



Maine to S. Dak., southw. to Fla., and Tex. 



7. Oenothera pilosella Raf. (Oenothera pratensis (Small) Rob. and 

 Kneiffia pratensis Small.) Sundrops. Map 1489. Usually common where 

 found. In low ground in open woods, open marshy places, and fallow 

 fields of slightly acid soil and along roadsides. 



Ohio to Iowa, southw. to Mo. and Ark. Recorded from eastern N. E. 



8. Oenothera tetragona Roth. var. longistipata (Pennell) Munz. 

 (Probably in part, Oenothera fruticosa of Gray, Man., ed. 7 and Kneiffia 

 fruticosa of Britton and Brown, Illus. Flora, ed. 2.) Map 1490. Usually 

 in moist, black sandy soil in prairie habitats. In marshes and along road- 

 sides. 



The species varies from dwarf and simple-stemmed plants to those 

 with long spreading branches, the last form sometimes decumbent. I am 

 citing my no. 48906 as exceptional. It seems to be a hybrid in that it 

 has the pubescence of O. pilosella, flowers intermediate, otherwise as this 

 variety. 



N. E. to Minn., southw. to Ga. and Ind. When this species is studied 

 further, the range may be changed. 



9. Oenothera perennis L. var. typica Munz. {Oenothera pumila L. and 

 Kneiffia pumila (L.) Spach.) Map 1491. Our specimens from southern 

 Indiana were found in hard, white clay soil and those from the northern 

 part were in a wet, prairie habitat. 



N. S. to Man., southw. to Ga. and Kans. 



10. Oenothera speci6sa Nutt. (Hartmannia speciosa (Nutt.) Small.) 

 Map 1492. I have collected this species from the side of a railroad, a 



