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 — Submonl. 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 — -Submonl. Je-Jl. 



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

 into cuneate-obovate incisetl 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 gromid: Lab.— Md. — N.M. — Alta. Plain — Subtnont. 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. narcissiflora 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 15 mm. long, white, glabrous. Hillsides: Ida. — Wash. Submonl. My-Jl, 



2. PULSATILLA Adans. ^ ^asque-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 niunerous. 

 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. occiclentalis 



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 ram. 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 stonj^ hills 

 and mountains: Alaska — Galif. — 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 





