250 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



Dry plains and hills, at an altitude of 1000-2000 m. 



Montana: Gallatin Co., 1888, 7^ Tweedy, 206; Fort Benton, 

 Jo/in Pearsall, 838 (Lt. Mullan's Exped.) : 1882, Tweedy, 203; Frid- 

 ley, 1887, 144; Gardiner, 1885, sj8 : Gallatin Co., M?'s. Alderson ; 

 Grafton, 1892, 7?. S. Wi/liams, gy ; Shields River, 1883, Scribner, 

 2ja; Billings, 1898, Williams & Griffith. 



Aragallus sericeus (Nutt.) Greene, Pittonia, 3: 212: Uxytrofis 

 sericea Nutt.; Torr. & Gray, Fl. N. Am. i: 339; O. Lambertii 

 sericca Gray, Proc. Am. Acad. 20: 7 [Man. R. M. 70] ; Spiesia 

 Lambertii sericea Rydberg, Bot. Surv. Neb. 3: 32 [111. Fl. 2: 



309]- 



On plains and prairies, at an altitude of about 1500 m. 



Montana: Custer Co., 1892, Mrs. Light. 



*Aragallus Besseyi. 



Oxytropis argentata Pursh, Fl. Am. Sept. 473 ; not Persoon. 



Perennial, more or less tufted ; basal leaves numerous, 'gra3-ish 

 silky-strigose or somewhat villous; leaflets 5-12 pairs, oblong- 

 lanceolate, 10-18 mm. long and 3-5 mm. wide, acute; scape erect, 

 strict, 1-2 dm. high; spike short and dense, almost subcapitate ; 

 bracts green, lanceolate, about i cm. long, silky-ciliate ; calyx vil- 

 lous with long silky hairs, its linear subulate lobes equalling the 

 claws of the petals ; corolla dark bluish purple : standard rather 

 narrow, oblong, deeply two-lobed at the summit; wings large, a 

 little exceeding the standard in length, two lobed at the end, the 

 upper lobe broadly ovate, the lower rounded ; keel rather small, 

 shorter than and wholly inclosed by the wings ; fruit ovate-oblong, 

 acuminate into a long beak, coriaceous, half two-celled, silky-villous 

 and exceeding the calyx. 



In general habit, pubescence, and the form of the leaflets, it very 

 much resembles A. Lambertii, from which it is easily distinguished 

 by the form of the standard and the wings. It grows on dry 

 hillsides, at an altitude of 1800 m. The species is named in 

 honor of Mr. Ernst A. Bessey, the second son of Professor Charles 

 E. Bessey, of the University' of Nebraska. Mr. Bessey, who is a 

 very promising young botanist, was my assistant during the botanical 

 exploration in 1897. 



Montana: Spanish Basin, June 23, 1897, Rydberg <£- Bessey, 

 4301 (type) ; Melrose, 1895, Rydberg; Bozeman, 1886, Tzveedy, 

 I02J ; Smith River, 1883, Scribner, 2g. 



Yellowstone Park : 1888, Dr. Chas. II. Hall. 



