CROWFOOT FAMILY 299 



linear; petals oblong to elliptic, 5-6 mm. long; beak short. Wet places and open 

 woods: Mont. — Colo. — -Utah — Ida. Mont. — -Subalp. Je-Au. 



20. R. Eschscholtzii Schlecht. Stem 1-3 dm. high; basal leaf -blades 1-3 

 cm. wide, 3-5 parted and again cleft; lower stem -leaves similar, but short-peti- 

 oled; petals obovate, often retuse, 6-8 mm. long; head of fruit globose to oblong; 

 R. ocreatus Greene, an undeveloped form, with rather large stipules. Wet places: 

 Alaska— Alta. — Colo.— Calif. Mont. — Alp. Je-Au. 



21. R. Helleri Rydb. Stem slender, 1-2 dm. high; blades of basal leaves 

 1-3 cm. wide, 3-cleft, often to near the base, and again cleft; lower stem-leaves 

 similar, but more divided; petals 6-7 mm. long, oblong or obovate; head of fruit 

 almost globose. Bogs: Ida. — Mont. — Wyo. Mont. — Subalp. Jl-Au. 



22. R. vericundus B. L. Robins. Stem 1-3-flowered, ascending, 5-10 cm. 

 high, glabrous or villous above; basal leaf-blades reniform, 3-cleft; middle seg- 

 ment 3-lobed; stem-leaves divided into 3-4 oblong divisions; petals about 5 

 mm. long, exceeding the hairy sepals; head of fruit slightly oblong. Perhaps 

 not distinct from the arctic R. Sabini R. Br. Wet places: Mont. — Wash. 

 Subalp. Jl-Au. 



23. R. ovalis Raf. Stem 0.5-3 dm. high, more or less villous, especially 

 when young; basal leaf -blades 1-3 cm. wide, from reniform or orbicular to rhom- 

 bic-oval, crenate or round-lobed, some occasionally cleft, hairy when young; 

 upper stem-leaves sessile, with linear or oblong divisions; sepals villous; petals 

 obovate to oblong-cuneate, 4-6 mm. long; head of fruit globose; beak short. 

 R. rhomboideus Goldie. R. brevicaulis Hook. Meadows: Lab. — Que. — Colo. — • 

 Alta. Plain — Submont. My-Je. 



24. R. Jovis A. Nels. Roots tuberous; stem 3-4 cm. high, glabrous ; basal leaf- 

 blades divided into 3-4, linear or oblanceolate, obtuse divisions, or entire; stem- 

 leaf solitary, similar, sessile; sepals oval, glabrous; petals oblong-spatulate, 6-7 

 mm. long; head of fruit globose; achenes glabrous, with a stout curved beak. 

 R. digitatus Hook., not Willd. Moist ground, around snowdrifts: Ida. — Wyo. 

 — Nev. Mont.— Subalp. My-Jl. 



25. R. Drummondii Greene. Stem 5-10 cm. high; basal leaf -blades 2-3 

 cm. wide, triternately divided, with short oblong divisions, sparingly pubescent; 

 stem-leaves similar or biternate; sepals oval, pubescent externally; petals oval; 

 head of fruit globose; beak curved, a little shorter than the achene. R. pedaii- 

 fidus Hook., not Smith. R. Hookeri Regel., not Schlecht. R. Grayi Britton, 

 not R. Grayanus Freyn. Barren summits: Canadian Rockies — Colo. 



26. R. stenolobus Rydb. Stem 1-2 dm. high, usually branched; basal 

 and lower cauline leaves petioled; blades three times ternately dissected into 

 almost linear segments, which are 6-15 mm. long and 1-3 mm. wide; sepals 

 oval, 4-5 mm. long; petals obovate, 7-8 mm. (rarely 9-11 mm.) long; head of 

 achene spherical or slightly oblong, about 6 mm. broad. Alpine wet meadows: 

 Utah— Wyo. Mont.— Alp. Jl-Au. 



27. R. adoneus A. Gray. Stem 1-2 dm. high, glabrous, 1-2-flowered ; 

 sepals oblong or elliptic, villous, 6-10 mm. long; petals broadly cuneate-obovate 

 or fiabelliform, usually overlapping, 10-18 mm. long; head of fruit slightly oblong, 

 glabrous. Near snowdrifts: Wyo. — Colo. — Utah. Mont. — -Alp. Jl-S. 



28. R. pygmaeus Wahl. Stem 1-flowered, 2-5 cm. high, pubescent above, 

 decumbent or ascending; leaf -blades reniform, 3-cleft, the lateral divisions of the 

 basal leaves rounded, 2-16bed; petals 2-4 mm. long; head of fruit globose or 

 ovoid; achenes glabrous; beak short. Wet grassy places: Greenl. — -Canadian 

 Rockies — Alaska; Eurasia. Alp. Jl-Au. 



29. R. apetalus Farr. Stem 2.5-3 dm. high, glabrate below, villous above; 

 basal leaf -blades orbicular to cordate in outline, crenate to deeply 5-9-lobed; 

 cauline leaves divided to the base into cuneate incised divisions; sepals very con- 

 cave, suborbicular, villous without; head of fruit oblong to ovoid. Roadsides: 

 Alta. Mont. 



30. R. abortivus L. Stem 1.5-6 dm. high, branched; basal leaf-blades 

 1-5 cm. wide, the later ones more or less deeply 3-cleft; upper stem-leaves sessile. 



