56 LAWSON: REVISION OF THE 



limits observed : 72' 20' : 69' lo .—Hurt, Brit. Polar Expd., 18*75-6. Jacobshavn, Disco 

 Bay, Greenland, 186*7. — Brown. Iceland, 1860. — Dr. W. L. Lindsay. This species inhabits 

 all Sir Joseph Hooker's five Arctic Areas, but does not attain the highest latitudes. 



23. — Ranunculus hyperboreus, Rotlboll. 



Stem filiform, creeping. Leaves petioled, trifid ; lobes oblong-oval, divaricate, the 

 lateral ones somewhat 2-cleft, the middle one entire, the short petioles sheathing at the 

 base, the sheaths aiiricled by tv^^o stipule-like dilatations. Petals 1-flowered, flower 

 small, sepals reflexed, petals yellow, shorter than the sepals. Heads of achenes globose, 

 or ovate. Plant glabrous or somewhat pubescent. 



Ranunculus hyperboreus. RottboU, Act. Hafnise, X., p. 458, t. 4, fig. 16. (1*7*70.) Fl. 

 Danica, t. 331. (Trimen, Jour. Bot., XVIII., p. 2*78.) Retzius, Prod. Fl. Scand., n. 691. DC. 

 Syst. Nat., I., p. 272. Prod., I., p. 35. Brown, Parry's 1st Vo}^, p. 243. Hook, Parry's 

 2ad Voy., App., p. 4 ; 3rd Voy., App., p. 29. Fl. Bor.-Am., I., p.' 16. Torr. & Gr., Fl. N. 

 Am., I., p. 20. Hook. f. & Thoms., Fl. Indica, I., p. 32. Walp. Ann,, IV., p. 19. Hook, f., 

 Arct. PL, pp. 283 and 312. 



R. Ammnni. Gunner, Fl. Norvegica, No. 826. (1772.) 



Marshes in the Rocky Mountains, lat. 52° to 57°. — Driimrnond, in Hook., Fl. Bor.-Am. 

 In Greenland, west coast, lat. 69° 15' to 72" 48'. Disco and Upernavik. In very wet 

 ground near Upernavik Settlement this plant is very common. — Hart, Brit. Polar Exped., 

 1875-6. JacobshaAm and Akatout, Disco Ray, Greenland, 1867. — Brown. Iceland, 1860. — 

 Dr. W. L. Lindsnij. Norway. Lapland. Siberia. Spjtzbergen. Himalayas. Arctic 

 Areas of Europe, Asia and Greenland. — Hook. fil. 



Sir Joseph Hooker observes that he has seen no Arctic American specimen of this 

 plant ; all so called he thinks referable io pygmœiis. Outl. Distr. Arct. PI., p. 312. 



24. — Ranunculus hyperboreus, var. pygm^us, Wuldenberg. 



Stem erect, without creeping flagella. Radical leaves petiolate, cauline ones sessile. 

 Stem 1-flowered. Sepals somewhat reflexed, glabrous or slightly hairy. A very small 

 glabrous plant, with the habit of Saxifraga rivularh, and intermediate between R. hyper- 

 boreus and nivalis. DC. 



Ranunculus pygmœus. Wahlenberg, Fl. Lapponica, n. 286, t. 8, f. 1. Pursh, FL, II., p. 

 393. DC. Syst. Nat., I., p. 273. Hook., Fl. Bor.-Am., I., p. 16. Torr. & Gray, Fl. N. Am., 

 I., p. 20. Regel, Fl. Ost-Sib., I., p. 46. Hook f., Arct. PL, pp. 283 and 312. Lawson, 

 Ranunc. Canad., p. 39. Watson, Bibl. Index, I., p. 22. Macoun, Cat. No. 40. Brown 

 Camp., Fl. Discoana, p. 447. 



R. nivalis, ft. Linn. Sp. Plautarum, p. 778. 



R. nivalis pygmœus. Fl. Lapp., p. 232, t. 3, L 3. 



R. Sabinii. R. Br., in Parry's 1st Voy. App., p. 244. Hook. Fl. Bor.-Am., I., p. 17. 

 Torr. & Gr., FL N. Am., I., p. 20. Durand, Kane Exp., p. 185. 



R. hyperboreus. Hook. f. & Thomson, Fl. Indica, I., p. 32. Walpers, Annales, IV., p. 19. 



Moist grassy places on the high parts of the Rocky Mountains, in lat. 55° .—Dmmmond. 



