RANUNCULACE^ 45 



* Aquatic. 

 t Petals white. 



1. R. aquatilis, L. White Water Crowfoot. 

 Leaves finely dissected, submerged, collapsing 



when withdrawn from the water. Common in 

 stagnant or glow-running water, Man.-Alta. 



2. R. circinatus, Sibthorp. 

 Resembling the preceding but the leaves with 



broad stipules and rigid, not collapsing when taken 

 from the water. A rarer form but not uncommon Fig. 38. — Flower of a 

 in the prairie region. Buttercup in Section. - 



ft Petals yellow. 



3. R. delphinifdlius, Torr. Yellow Water Crowfoot. 



Leaves either floating or immersed, all repeatedly 3-forked into long 

 thread-like divisions. Common in slow-running water, but continuing to 

 grow in the mud if the water dries up, in which case the leaves are not cut, 

 and the flowers are smaller. (B. mvltifidus, Pursh.) Man.-Alta. 



** Terrestrial, but often growing in wet places. 

 X Creeping. 



4. R. cymbalaria, Pursh. Seaside Crowfoot. 



Smooth, spreading by means of long runners; scapes several-flowered; 

 leaves rounded, crenate, and clustering at the base. Very common in low 

 places, preferring alkaline soil," Man.-Alta. 



5. R. Flammula, var. reptans, (L.) Mey. Creeping Spearwort. 



Stem slender, creeping, rooting at the joints, pubescent or glabrous; 

 peduncles erect ; leaves linear or nearly so, usually entire, narrowing into 

 petioles ; flowers small, solitary, bright yellow, the petals greatly exceeding 

 the calyx ; achenes flattened, beaked. Sandy shores of lakes and rivers, 

 Man.-Alta. 



6. R. repens, L. Creeping Bdttercup. 



Stem creeping and rooting at the joints ; leaves 3-parted or 3-lobed, the 

 divisions or lobes variously cut or toothed, usually more or less pubescent, 

 sometimes spotted with white ; flowers large, yellow. Low ground and along 

 ditches or streams. " Numerous places on the great plains." — Macoun. 

 "Swamps, foothills of Rooky M.ts." —^ Dawson. 



H Erect, or nearly so. 



7. R. scelerStus, L. Cursed Crowfoot. 



Annual, glabrous; leaves deeply 3-lobed or 3-parted; stem ferge and 

 hollow, often appearing rather naked ; flowers small and pale yellow. Com- 

 mon around the edges of ponds, Man -Altn. 



