316 Karl M. Wiegand and Arthur J. Eames 



different strains of the same species in hand when he proposed these two names. 

 Other strains of the species besides the two found in" this flora occur on the Atlantic 

 Coast and in western U. S. 



la. O. parviflora L., var. 



Stony and sandy shores; local. 



Shore, Lake Ridge; talus at foot of cliffs n. of King Ferry; shore at Long Point. 



The same form, apparently, occurs on the sandy shores of Lake Ontario. 



2. O. biennis L., var. nutans (Atkins. & Bart.) Wiegand. (See Rhodora 15:83, 



1913, and 26: 3, 1924. O. nutans Atkins. & Bart.) Evening Primrose 



Damp sandy or gravelly fields and stream banks, in rich or calcareous locations ; 

 frequent. July-Aug. 



Widely distributed in e. N. A. 



The present treatment of O. biennis L. and its allies has been worked out after 

 the collection of a large amount of local material and a study of the group at the 

 Gray Herbarium. It has not been possible to correlate all the related species recently 

 proposed by various writers, and the treatment here given is not considered final but 

 simply as the best method of dealing with the local forms for the present. A 

 country-wide consideration of the group seems to show two good " taxonomic" species, 

 O. parviflora and O. biennis, separated by fairly constant characters of pubescence 

 and seed, but the strains within each of these species intergrade extensively. 



2a. O. biennis L., var. pycnocarpa (Atkins. & Bart.) Wiegand. (See Rhodora 

 15 : 83, 1913, and 26 : 3, 1924. O. pycnocarpa Atkins. & Bart.) 



Dry fields and roadsides, in gravel and clay; common. July-Aug., and often again 

 in Sept. 



N. E. to Minn., and southw. 



2b. O. biennis L., var. 



Dry fields and roadsides, in sandy or gravelly, often more acid, soils ; frequent 

 July-Aug., and again in Sept. 



Near the Agricultural College greenhouses; Recknagel lot, Upland Road, Cayuga 

 Heights; n. of Townley Swamp; gravelly lake shores, Lake Ridge, King Ferry, and 

 Long Point ; n. of Cayuta Lake ; sandy field, Phillips farm, West Junius. 



Widely distributed in e. N. A. 



3. O. perennis L. (See Rhodora 25:47. 1923. Bui. Torr. Bot. Club 46:372. 1919. 



O. pmnila L. and of Cayuga Fl.) Sundrops. 



Damp sandy or gravelly fields and roadsides, in sterile, mostly neutral, soils ; 

 abundant. June 20-July. 



Common in nearly all the towns s. and e. of Ithaca, and back from the shores of 

 Cayuga Lake. 



Newf. and Man., southw. to Ga. and Wis. ; less common or rare on the Coastal 

 Plain. 



4. O. pratensis (Small) Robinson. Sundrops. 



Brackish meadows : rare. June 20-Tuly. 



N. e. of Montezuma village, 1919 (K. M. W ., A. J. E., & L. F. Randolph), 

 abundant. 



S. Me. to Conn., also cent. N. Y. to Iowa, southw. to Ark. 



This species is probably adventive here, as a plant so showy would scarcely have 

 been overlooked by Dudley. 



