loS 



RANUN'CULACEAE. 



Vol. II. 



10. Ranunculus pygmaeus Wahl. Pigmy Butter- 

 cup. Fig. 1904. 



Rununculus pygmaeus Wahl. Fl. Lapp. 157. 1812. 



Small, I'-a' high, glabrous or sparsely pubescent. Rasal 

 caves slender-petiolcd, deeply 3-5-lobed or divided, the 

 blade 3"-6" wide; those of the stem similar and nearly 

 sessile; flowers yellow, 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, 4-12' 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'-i5' high, simple or usually spar- 

 ingly branched. Basal leaves long-petioled, 

 orbicular to ovate or oblong-ovate, mostly 

 I'-iS' 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. 



