MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 279 



and smaller; spike leafy, many-flowered; flowers 6-7 cm. long; 

 ovary and tube somewhat pilose, the latter about 3cm. long and 2-3 

 mm. wide ; sepals linear-lanceolate, acuminate, in bud gradually 

 contracted into the short free tips; petals obcordate, 1.5-2 cm. long 

 and almost as broad; capsule 3-4 cm. long, inverted club-shaped; 

 seeds irregular, obtusely angled, reddish brown, about 2 mm. long. 



Nearest related to O. Hookeri, but differs in the much smaller 

 flowers, which are always pure yellow, never tinged with rose. From 

 O. h/'cniu's and O. Oahesiaua it differs in the grayish short-strigose 

 pubescence. It grows in rich soil, in meadows, creek banks, borders 

 of fields, etc. 



Montana : Pony, July 8 and 12, 1897, Rydbcrg & Bessey, 4584 

 Meadow Creek, July 12, 4S^3 ^ Spanish Basin, 1896, JFlodjiian, 680 

 Cottonwood Creek, 1892, \V. F. Shazv ; Helena, 1887, Kelsey 

 Mill Creek, 1887, Tweedy, 2j6; Teton River, 1883, Scribner, 57. 



* Onagra strigosa subulata. 



Like the species, but the sepals in bud abruptly contracted into 

 long subulate free tips. 



Montana: Forks of the Madison, July 26, 1897, Rydberg & 

 Bessey, -/jSS. 



* Onagra f Hookeri (Torr. & Gray) Small, Bull. Torr. Bot. Club, 23 : 



171 ; OEnotliera Hookeri Torr. & Gray, Fl. N. Am. i : 493 ; OE. 



biennis hirsutissinia Gray, PI. Fend. 43 [Bot. Cal. i : 223]. 



Like the preceding, but the more hirsute flowers much larger and 

 generally tinged with red. Rare. 



Montana: Silver Bow Co., Miss Louise Hammond (Small- 

 flowered.) 



* Onagra depressa (Greene) Small, Bull. Torr. Bot. Club, 23: 170; 



OEnothcra depressa Greene, Pittonia, 2: 216. 



Resembling somewhat O. strigosa, but prostrate, the leaves 

 broader, elliptic-lanceolate, and with a much denser pubescence. 



Montana : Custer, Blankinship. 

 Anogra albicaulis (Pursh) Britton, Mem. Torr. Bot. Club, 5: 234 



[111. Fl. 2: 488]; OEnothera albicaulis Pursh, Fl. Am. Sept. 



733; O. pinnatifida^xxii. Gen. i: 245 [Man. R. M. 103]. 



Sandy plains and prairies, up to an altitude of 1500 m. 



Montana: Big Horn River, 1892, Txveedy ; Crow Indian Reser- 

 vation, 1891, Tzveedy ; Lewis & Clarke Co., Mrs. Fannie Har- 

 wood; Custer Co., 1892, Mrs. Light. 



tThe characters of the various genera formerly included in OEnothera are pointed 

 out bv Dr. J. K. Small in Bull. Torr. Bot. Club, 23 : 167-194. 



