io8 



RANUNCULACEAE. 



Vol. II. 



10. Ranunculus pygmaeus Wahl. Pigmy Butter- 

 cup. Fig. 1904. 



Ranunculus pygmaeus Wahl. Fl. Lapp. 157. 1812. 



Small, 1-2' high, glabrous or sparsely pubescent. Basal 

 eaves slender-petioled, deeply 3-5-lobed or divided, the 

 blade 2''-(>" wide; those of the stem similar and nearly 

 sessile ; flowers yellovv', 2"-3" wide, the petals slightly ex- 

 ceeding the glabrous or slightly pubescent sepals; head of 

 fruit short-oblong, 2" long; achenes i" long, lenticular, 

 tipped with a slender beak. 



Quebec, Labrador, arctic America, and in the Rocky Moun- 

 tains. Also in Europe and Asia. 



Ranunculus Sabini R. Br. is another arctic and Rocky Moun- 

 tain species, differing from this by larger flowers and densely 

 pubescent sepals. 



II. Ranunculus pedatifidus J- E. Smith. 

 Northern Buttercup. Fig. 1905. 



Ranunculus pedatifidus J. E. Smith in Rees' Cyclop, no. 

 72. 1813-16. 



R. affinis R. Br. in Parry's Voy. App. 265. 1823. 



Erect, 4'-i2' high, branching. Basal leaves peti- 

 oled, broadly ovate or nearly orbicular, about i' 

 broad, obtuse, irregularly deeply cleft, those of the 

 stem deeply lobed, nearly sessile, the lobes narrow; 

 flowers yellow, 4"-6" broad, the petals exceeding the 

 spreading pubescent calyx; head of fruit oblong, 3"- 

 6" long; achenes oval, tipped with a short beak, 

 often hairy. 



Labrador to Alaska, south in the Rocky Mountains to 

 Arizona. Also in northern Asia. Rough-fruited crow- 

 foot. Summer. 



12. Ranunculus cardiophyllus Hook. 

 Heart-leaved Buttercup. Fig. 1906. 



R. cardiophyllus Hook. Fl. Bor. Am. I: 14. 1829. 



Ranunculus pedatifidus cardiophyllus Britton, Bull. 

 Torr. Club 18: 265. 1891. 



Erect, 4-15' high, simple or usually spar- 

 ingly branched. Basal leaves long-petioled, 

 orbicular to ovate or oblong-ovate, mostly 

 I'-il' broad, coarsely crenate, incised or shal- 

 owly lobed, those of the stem short-petioled 

 or nearly sessile, deeply lobed or parted, the 

 lobes narrow, mostly acute or acutish ; flowers 

 yellow, larger than in R. pedatifidus, 8"-io" 

 broad, the petals much exceeding the densely 

 tomentose calyx; head of fruit cylindric or 

 ovoid-cylindric, 6"-8" long; achenes subor- 

 bicular, slender-beaked, finely hairy. 



In wet meadows and low grounds, Alberta and 

 Saskatchewan to Nebraska and Colorado. May- 

 Aug. 



