OF ARTS AND SCIENCES. 341 



The flowers are large (2 to 2i: inches broad), and fragrant. The species 

 commemorates the naturalist, Thomas Say, the collector of Long's party. 



4. R. Arkansana, Porter. Stems usually low (^ to G feet bigh), 

 more or less densely prickly : foliage more or less glaucous, the stip- 

 ules usually narrow, more or less glandular-toothed above and some- 

 times glandular-ciliate ; leaflets 3 to 5 pairs (usually 7 or 9), broadly 

 elliptical to oblong-oblanceolate, somewhat cuneate at base, nearly ses- 

 sile or often petiolulate, glabrous, or more or less pubescent beneath, 

 simply and coarsely toothed, or the pubescence sometimes resinous 

 and the teeth rarely serrulate, the terminal ^ to 2 inches long: flowers 

 corymbose, very rarely solitaiT ; sepals naked or sometimes more or 

 less hispid, the outer with one or more lateral lobes : fruit as in the 

 preceding. — Porter & Coulter, Syn. Fl. Colorado, 38. H. hlanda^ 

 var. setigerd, Crepin, 1. c. 394, mainly. 



IIab. Very frequent in the mountains from Western Texas and New Mexico 

 to British America, and eastward to the Upper Mississippi and Saskatchewan. — 

 Western Texas, on the Liinpio ( Wright, igdow) ; New Mexico, at Sante Fe 

 (Fendler, Engelmann), and Las Vegas (Enqelmann, G. R. Vaseij) ; Colorado, on the 

 Arkansas at Canon City (Bnnulegee), at Hot Sulphur Springs, Manitou Springs, 

 and Empire (Engthnann), Colorado Springs {Torrei/, Recljitld), Twin Lakes 

 ( IVoIf), Sangre de Cristo Pass (Hooker <f- Gray), and at Denver (Engelmann, 

 Jones) ; Nebraska, on Loup Fork [Hayden) ; Montana ( Ward), on Frenchman's 

 Creek {Cones), Upper Yellowstone (Allen), Nevada Creek (Snrgenl), and Hound 

 Creek (Scribner); Dakota, at Devil's Lake (Nicollet), Fort Clark (Slevens), Bis- 

 marck (Sargent), and Pembina (Havard), a form very near R. hianda; Western 

 Missouri, Cass County (Droadhead) ; Iowa (Arthur, Coulter) ; Minnesota, at 

 St. Paul (Zes(7;(ere!(x), near Minneapolis (.l//ss Butler, Engelmann, Uphaw),Fi])e 

 Stone City (Mrs. Bennett), and Wabasha ( Gibson) ; Manitoba, at Brandon (Scott) ; 

 Assiniboine, Souris Plain (Macoun); Saskatchewan (Bourgeau). 



The most pubescent form of this species is common upon dry prairies from 

 the Upper Mississippi westward and to the Saskatchewan. The flowers are 

 here sometimes white. In Eastern Minnesota and Iowa it occurs with the re- 

 ceptacle more or less hispid. 



B. — Stems with infrastipular spines, and often more or less covered with scat- 

 tered prickles. 

 * Pedicels and receptacles naked (very rarely hispid), 

 t- Sepals entire. 

 ++ Flowers large, solitary. Fruit large. Stipules usually dilated. 



5. R. NuTKANA, Presl. Stems stout, 1 to 4 feet high, armed with 

 stout straight or recurved spines, the branches sometimes unarmed, and 

 young shoots sometimes prickly : stipules glandular-ciliate ; leaflets 5 

 or 7 (very rarely 9), broadly elliptical to ovate or oblong or lanceolate, 

 usually rounded at base, obtuse or acute (the terminal ^ to 2 inches 

 long}, resinous beneath (as well as the rhachis and stipules) and the 



