s 2 LAWSON : REVISION OF THE 



The plant having been much confounded with the R. auricomus of Euro^îe, it is dif- 

 ficult to trace its distribution. In some of its forms it runs down the mountains into 

 New Mexico, as appears from Parry and Fendler's collections. I have gathered it on 

 the mesa around the Colorado peaks. 



R. auricomus of Europe has three distinct sets of leaves, viz. : 1. Eadical leaves, which 

 are long petioled, reniform, three-lobed or -partite. 2. Lower cauline leaves, which are 

 shortly petioled, pedatcly divided into broad lobes. 3. Upper cauline leaves, which are 

 sessile and embracing, digitately divided into slender linear lobes. The whole plant is 

 nearly glabrous, of a vivid green colour like the sylvestral form of R. abortwus, the calyx 

 is only slightly hairy, and the achenes are in a globose head. It grows in warm sheltered 

 woods, never in exposed situations, and does not extend far north, nor to very great 

 elevations. R. affinis, on the contrary, is conspicuously arctic and alpine in its range. 



1*7. — Eanunculxjs affinis, var. cardiophyllU!?, Grai/. 



Robust and roughly hairy ; radical leaves rounded-cordate with the base rather 

 deeply emarginate, undivided or many-cleft, crenate; cauline ones palmately cleft into 

 linear incisely crenate lobes ; sepals spreading, half the length of the petals ; head of 

 achenes oblong. 



Ranunculus affinis, var. cardiopliyllus, Gray, Proc. Am. Acad., 1863, p. 56. "Wats., 

 Index, I, p. 16. Macoun, Cat. under No. 34. 



R. cardiopliyllus. Hook., Fl. Bor.-Am. I, p. 14, t. 5. Bot. Mag., t. 2999. Torr. & Gr., 

 Fl., I, p. 18. 



In the central prairie and limestone districts. — Richardson, Dru)nmo7id. Alpine prairies 

 in the Rocky Mountains. — Drtimmond, (Hooker.) Vicinity of Morley, Bow Eiver, seven 

 miles north-west of Edmonton. — Macoun. 



18. — EANtTNCTJLtrs AFFINIS, var. LEIOCARPUS, Trautvetter. 



Eadical leaves divided, the lobes oblong-lanceolate or linear-lanceolate, entire or 

 incisely dentate. Stem leafy. 



Ranunculus affinis, var. leiocarpus. TrautA^etter, in PI. Schrenk., p. '71. Eegel, Fl. Ostsib., 

 I, p. 45. Watson, Index, p. 16. Macoun, Cat., under No. 34. 



R. pedatifidus, of Sm., DC, Ledeb., Trail tv. & Meyer, and Turcz., according to Eegel, 

 Fl. Ostsibir., I, p. 46. 



Top of Mount Albert 4,000 ft. ; Shickshock Mountains, Gaspé. — Macoun, in Herb. 

 Canad. Survey. Table Top Mountain, Gaspé, July 30, 1883. — Porter, in Herb. Canad. 

 Survey. 



19. — Eanunculxjs ovalis, Rajinesque. 



Stem very short, rising from 5 or 6 inches in flower and fruit. Leaves mostly radical, 

 ovate or obovate, more or less rhombic or sagittate, long petioled, toothed, those on the 

 stem nearly sessile, lobed or parted, the upper ones into linear segments. Flowers large. 



