OF ARTS AND SCIENCES. 369 



R. NIVALIS, L. Extends across Arctic America, and from Hud- 

 eon's Bay to the Alaskan Islands. A high arctic form, R. sulphureus, 

 Solander in Phipps, &c., comes very near to R. Altaicus. 



++ ++ Calyx not dark-hairy : akenes not muricate nor rough-hispid. 

 = Leaves some of them quite entire (except in the first species), some 

 simply few-lobed and the lobes entire : alpine or subalpine low 

 perennials, with fascicled-fibrous or tuberous roots, glabrous. 



a. Radical leaves round-reniform and with 5 to 9 roundish lobes or 

 deep crenatures : akenes dorsally carinate and subulate-beaked, col- 

 lected in an oblong head. 



R. OXYNOTUS, Gray, Proc. Am. Acad. x. 68. — Higher Sierra Ne- 

 vada, Brewer, Lemmon. 



b. Radical leaves neither reniform nor cordate, nor several-lobed : 

 akenes turgid and dorsally rounded, collected in a globose head. 



R. GLABERRiMUS, Hook. Fl. i. 12, t. 5. — Rocky Mountains to 

 those of the Sierra Nevada and Brit. Columbia ; early flowering. R. 

 brevicaulis, Hook. Lond. Jour. Bot. vi. 66 (but not of the Flora) is a 

 form of this. 



R. DiGiTATUS, Hook. Kew Jour. Bot. iii. 124, t. 4. Smaller, hetero- 

 phyllous, 5-11-petalous ; the roots fleshy-thickened in the manner of 

 R. Ficaria. — Rocky Mountains, and west to those of Nevada and 

 Utah. 



= = Leaves all palmately or pedately lobed or divided, small : akenes 

 turgid-lenticular, acute or acutish on the back, tipped with a small 

 subulate beak : strictly arctic-alpine perennials, fibrous-rooted from 

 a short caudex, tufted, a span or less high : flowers mostly solitary, 

 not large, their rounded petals little surpassing the calyx. 



R. PYGM.'Eus, Wahl. R. Sabinii, R. Br. — Throughout the breadth 

 of Arctic America, and in the higher Rocky Mountains south to 

 Colorado. 



R, HoOKEUi, Regel. Stouter : radical and often the very few cau- 

 line leaves biternately or pedately divided and parted, primary divis- 

 ions sometimes petiolulate and the lobes linear-oblong or spatulate : 

 stem 1-2-flowered : petals 3 lines long, surpassing the rounded sparsely 

 and finely villous sepals : akenes a line long, in a globular head. — PI. 

 Radd. i. 47 ; Wats. Bibl. Ind. 19, not Schlecht. 7?, pedatifidus. Hook. 

 Fl. i. 18, t. 6, not Smith, nor Schlecht. — Northern Rocky Mountains, 

 Drummond. Gray's Peak, Colorado, Patterson, both in flower and 

 fruit. The homonym of Schlechtendal is an extraordinary mixture, 

 VOL. XXI. (N. s. xni.) 24 



