OF ARTS AND SCIENCES. 339 



I. — Sepals connivent after flowering and persistent upon the receptacle. 



A. — Stems without infrastipular spines, naked or more or less covered with 

 slender prickles. Pedicel and receptacle naked. 



* Fruit oblong. Arctic species. 



1. R. ACiCULARis, Lindl. Stems low, often densely prickly : stip- 

 ules very broadly dilated, or narrow, glandular-ciliate ; leaflets 3 to 7 

 (usually 5), broadly elliptical and obtuse or acutish, to narrowly ob- 

 long and acuminate, more commonly oblong-lanceolate, mostly obtuse 

 or slightly cordate at base and subsessile, coarsely simply or occasion- 

 ally somewhat doubly serrate, often entire below the middle, glabrous 

 above, paler and more or less tomentose beneath, the terminal 1 or 2 

 inches long ; rhachis glabrous or pubescent, unarmed : flowers solitary ; 

 sepals nearly glabrous;, not hispid, entire: fruit 6 lines long, contracted 

 above into a neck. — Ros. Monogr. 44, t. 8. H. Carelica, Fries ; 

 Fl. Dan. Suppl. t. 75. 



Hab. Nortiiern Alaska; also through Siberia and in Northern Europe. — 

 At Fort Yukon (Ketchum) ; Fort Simpson (Onion, Kcnnicutt ^- Hardisty) ; Kus- 

 kokoin Valley (Weinmann) ; St. Michel's Island [Tunmr) ; and on the Kowak 

 liiver (^fcLenegan). 



Only flowering specimens of this species have been seen from Arctic Amer- 

 ica, but these accord closely with the fitrures and with Lindley's and Meyer's 

 descriptions, and with some of the Old World specimens that are so naiiieil in 

 Herb. Gray. The j'oung receptacle varies somewhat in form, but is usually 

 distinctly elongated. Tiie flowers are 1^ to 2 inches broad, deep rose-color and 

 fragrant ; tliey are said to be sometimes two or three together. The leaves 

 vary much in form, but incline to a rather peculiar oblong shape, most strongly 

 serrate toward the summit. Tlie sepals are described as sometimes his{>id in 

 Asiatic specimens, or with a narrow lateral lobe, and the leafstalk as sometimes 



prickly. 



* * Fruit usually globose. More southern species. 



2. R. Bi.ANDA, Ait. Stems 1 to 3 feet high, wholly unarmed, or 

 with usually a few slender straight scattered prickles, sometimes more 

 densely prickly: stipules dilated, naked and entire, or slightly glandu- 

 lar-toothed abnve ; leaflets 5 to 7 (very rarely 9), usually oblong- 

 oblanceolate, mostly cuneate at base anrl shortly petiolulate, coarsely 

 simply toothed, glabrous above, paler and glabrous or more or less 

 pubescent bonpath, not resinous or very rarely slightly so, usually 

 large (the terminal J to 2^ inches long); rhachis pubescent, sometimes 

 sparingly prickly: flowers large, corymbose or often solitary; sepak 

 entire, siiortly hispid or sometimes naked: fruit globose with more or 

 less of a neck below the calyx, sometimes oblong-obovate by a more 

 gradual attenuation of the base, 4 to G lines long. — Hort. Kew. 2, 202 ; 

 Jacq. Frngm. t. 105. R. fraxinifolia, Gmelin ; Lindl. Bot. Reg. t. 

 458. R. Solandrl, Tratt. Ros. 2. 150. 



