RANUNCULACE^E. (CROWFOOT FAMILY.) 7 



the root and at the joints of the long filiform rooting runners : petals loDger than 

 the sepals : the akenes striate-veined on the sides, enlarging upwards, with a 

 short oblique beak : head oblong. — Across the continent in marshy ground. 



6. R. glaberrimus, Hook. Stems 1 to 3-flowered : radical leaves broadly 

 oval, either entire or with 3 large blunt teeth at the apex ; stem-leaves cuneate at 

 the base, 3-cleft to the middle: sepals half as long as the petals : akenes plump, 

 tipped with a short curved beak : head globular. — From Colorado to Wyoming 

 and Washington ; also in California. 



* * * Some or all the leaves cleft or divided. 

 •*- Primary root-leaves crenate or toothed. 



7. R. rhomboid eus, Goldie. Dwarf (3 to 6 inches high), hairy: root- 

 leaves roundish or rhombic-ovate, rarely subcordate ; lowest stem-leaves similar 

 or 3 to 5-lobed ; the upper 3 to 5-parted, almost sessile, the lobes linear : petals 

 large, exceeding the calyx : akenes orbicular with a minute beak. — S. W. Colo- 

 rado to British America and eastward to Illinois and Michigan. 



8. R. abortivus, L. Glabrous, 6 inches to 2 feet high : primary root- 

 ieaA r es round heart-shaped or kidney form, barely crenate, the succeeding ones 

 often 3-lobed or 3-parted ; those of the stem and branches 3 to 5-parted or 

 divided, their divisions oblong or narrowly wedge-form, mostly toothed : petals 

 shorter than the refiexed sepals : akenes with a minute curved beak. — From the 

 mountains eastward across the continent. Most variable as to foliage. 



•t- +- Root-leaves lobed, cleft, or parted. 

 ** Style straight or wanting. 



9. R. hyperboreus, Rottb., var. natans, Regel. Stem filiform, creep* 

 ing : leaves glabrous, petioled, 3-cleft ; the lobes oval-oblong, divaricate, the 

 lateral ones somewhat 2-cleft : heads of akenes globose, compact : style wanting. 

 — In swamps at middle elevations, Colorado and northward. 



10. R. nivalis, L. Stem about \-flowered : radical leaves on long petioles, 

 dilated, lobed, the lobes somewhat ovate ; cauline ones nearly sessile, palmate ; 

 calyx very hirsute, shorter than the obovate entire petals : style as long as the 

 glabrous ovaries. — In the mountains of British America. 



Var. Eschscholtzii, Watson. Radical leaves 3-parted, the divisions lobed, 

 ciliate : style shorter than the akenes. — Colorado, Yellowstone Park, and north- 

 ward in the mountains. 



11. R. sceleratus, L. Glabrous: stem thick and hollow, a foot high: 

 root-leaves 3-lobed ; lower stem-leaves 3-parted, the lobes obtusely cut and 

 toothed ; the uppermost almost sessile, with the lobes oblong-linear and nearly 

 entire : petals scarcely exceeding the sepals : akenes barely mucronulate, very 

 numerous, in oblong or cylindrical heads. — From Colorado northward, and 

 across the continent. In drying, the numerous akenes are soon deciduous from 

 the receptacle. 



++ ++ Style curved. 

 = Stem usually 1-fioicered. 



12. R. pygmaeus, Wahl. Stem 1 to 2 inches high : leaves glabrous, 3 to 

 5-clefi ; radical ones petioled : sepals glabrous, longer than the somewhat refiexed 

 petals : heads oblong : akenes subglobose, pointed with a short hooked style. — 

 Mountains of Colorado and far northward. 



