288 RANUNCULACEAE 



bic-obovate, 3-cleft and coarsely toothed; inflorescence cymose; sepals greenish 

 white, 1 cm. or less long; heads of fruit 1-2.5 cm. long, 12-15 mm. thick. Woods 

 and river banks: N.S. S.C. Kans. Wyo. Alta. Plain Submont. Je-Au. 



9. A. riparia Fernald. Stem 6-10 dm. high, somewhat pubescent, 1-5- 

 flowered; leaf -blades ternate or quinate; divisions lanceolate, cuneate at base, 

 3-cleft and toothed; inflorescence cymose; head of fruit subcylindric, 2-3 cm. 

 long, 1 cm. thick. River banks: Me. Va. Alta. Plain -Submont. Je-Jl. 



10. A. Richardson! Hook. Basal leaf-blades round-reniform, deeply 5-cleft 

 into cuneate-obovate incised divisions; involucres of 3, dilated, cuneate, 3-lobed, 

 dentate leaves; sepals sulphur-yellow, elliptic, 8-15 mm. long; heads of fruit 

 subglobose; achenes comparatively few. Arctic and subarctic regions: Greenl. 

 -Hudson Bay Alta. Alaska. Subalp. My-Jl. 



11. A. canadensis L. Stem strigose, 2-6 dm. high, 1-3-flowered; leaf- 

 blades 10-12 cm. wide, 3-5-parted; divisions oblanceolate, 3-cleft and toothed; 

 involucral leaves similar but larger, often 15 cm. long or more, sessile and more 

 deeply cleft; sepals obovate or oval, 12-18 mm. long, white; head of fruit globose. 

 Low ground: Lab. Md. N.M. Alta. Plain Submont. My-Au. 



12. A. zephyra A. Nels. Stem 1-4 dm. high; leaf-blades more or less silky- 

 villous, but in age often glabrate, 5-8 cm. wide, ternate or quinate; divisions 

 cuneate to broadly obovate in outline, twice cleft into obtuse lobes; involucral 

 leaves much smaller, sessile and 3-cleft; petals white, broadly obovate, 10-15 mm. 

 long; head of fruit about 15 mm. broad, spherical; achenes flat,broadly spatulate 

 in outline. A. nardssiflora Am. auth. Alpine-arctic regions: Colo. Wyo. 

 Alaska. Mont. Alp. Jl-Au. 



13. A. Piperi Britton. Stem 1.5-3 dm. high, slender, very sparingly ap- 

 pressed-silky; basal leaves ternate; middle lobe rhombic-obovate or rhombic- 

 cuneate, coarsely toothed above the middle, 2-7 cm. long, the lateral ones broader, 

 obliquely ovate, 2-cleft to about the middle; sepals elliptic-obovate to oval, 

 about 15mm. long, white, glabrous. Hillsides: Ida. Wash. Submont. My-Jl, 



2. PULSATILLA Adans. PASQUE-FLOWER, BLUE TULIP, 



WILD CROCUS, LION'S BEARD (Fruit). 



Perennial scapose herbs, with a thick taproot and short caudex. Leaves 

 basal, palmately or rarely pinnately divided or dissected. Bracts of the scape 

 somewhat similar to the leaves, 3 in number, verticillate, often connate. Flow- 

 ers mostly solitary. Sepals 5-7, colored blue, purple, or white. Petals wanting. 

 Stamens numerous, the outer often changed into staminodia. Pistils numerous. 

 Fruit of numerous achenes, with much elongated, persistent, plumose styles. 



Flowers purple or violet, seldom white; involucral leaves sessile, palmately divided into 

 linear lobes. 1. P. ludoviciana. 



Flowers white or tinged with purple; involucral leaves petioled, ternate and twice pin- 

 nately dissected. 2. P. occidentalis 



1. P. ludoviciana (Nutt.) Heller. Leaf -blades ternate and repeatedly dis- 

 sected into linear divisions, 5-10 cm. in diameter, villous-hirsute or in age gla- 

 brate; scape 1-4 dm. high, villous; sepals ovate-oblong, 25-35 mm. long; achenes 

 silky, their styles about 3 cm. long. Anemone patens Nuttalliana A. Gray. P. 

 hirsutissima Britton. Prairies, plains, and hillsides: 111. Tex. -Utah -Wash. 

 Alaska. Plain Subalp. Mr-S. 



2. P. occidentalis (S. Wats.) Freyn. Leaf-blades ternate and then twice 

 pinnate-dissected, sparingly silky-hirsute; scape 1-6 dm. high, silky-villous ; 

 sepals oval or oblong, 2-2.5 cm. long; achenes silky, in fruit reflexed, their style 

 3 cm. long or more. Anemone occidentalis S. Wats. On gravelly or stony hills 

 and mountains: Alaska Calif. Mont. Alta. Submont. Mont. Je-Au. 



3. THALICTRUM L. MEADOW RUE, MAID-OF-THE-MIST. 



Perennial herbs, with rootstocks. Leaves alternate, ternately decompound; 

 petioles with dilated bases. Flowers perfect, dioecious, or polygamous, in pan- 

 icles or racemes. Sepals greenish white, 4 or 5. Petals wanting. Stamens 



