RANUNCrLACETE. 37 



13. R. Pennsylvanicus, L. f. (Bristly Crowfoot. Pennsylvanian Crowfoot.) 

 Leaves all .'J-jfartod. Stem stout, 1 to 3 feet high, erect, much branched. 

 Leaves teriiate, villous, segments sub-petiolate, acutely 3-lobe(l, somewhat 

 ovate, incisely serrate ; whole plant clothed with stiff, spreading hairs. 

 Flowers small, ])ale yellow. Calyx reflexed. Sepals longer than the petals. 

 Carpels crowned with a short, straight beak, massed into an oblong head. 

 July and August. 



Geo(jraphy. — Found in wet places, in Canada, eastern United States, and 

 west to Colorado. 



14. R. pusillus, Poir. (Puny Crowfoot.) Stem slender, erect, sometimes 

 prostrate, 6 to 12 inches high, branched. Leaves petioled, lower ones ovate, 

 orbicular or cordate, entire or sparingly toothed, upper ones linear-lance- 

 olate, obscurely tootiied, nearly sessile. Flowers small, pale-yellow, on long 

 peduncles, 1-flowered. Petals 1-5, sometimes 3, barely longer than the 

 sepals. Stamens 5-10. Carpels crowned with small blunt point. Juue 

 to August. 



Geography. — Southern New York, and along the eastern and southern parts 

 of the Southern and Gulf States to Louisiana, in wet places. 



15. R. recurvatus, Poir (Hooked Crowfoot. Wood Crowfoot.) Stem erect, 

 8 to 18 inches high, whole plant clothed with roughish hairs, sometimes fork- 

 edly branched. Leaves ternate, or deeply 3-parted, leaflets or segments 

 broad, wedge-shaped, and acute ; lateral ones 2-lobed ; lower petioles long, 

 sheathing at base ; upper ones much shorter. Plowers small, pale-yellow, on 

 short peduncles ; petals shorter than the reflexed sepals. Carpels in a glob- 

 ular head, margined, and crowned with the sharp-hooked style. Whole plant 

 pale-green. May to July. 



Geograplvj. — LaI)rador to Floritla, throughout northeastern North America. 

 Shady woods and damp jJaces. 



16. R. repens, L. (Creeping Crowfoot.) Stem G to 15 inches long, runners 

 sometimes longer, hairy wiien in dry ground, glabrous when in wet places; 

 sparingly branched. Root fascicled and large. Leaves ternate, on long stalks ; 

 leaflets wedge-shaped, 3-lobed, incisely toothed, middle one })etioled, lateral 

 ones on short petioles or nearly sessile ; hairy on the veins and edges when in 

 dry ground, veins conspicuous underneath. Flowers large, l)right yellow; 

 petals obovate, larger than the pilose sjjreading sepals. Carpels with a straight 

 point, strongly margined. May to .iVugust. 



Foliage and general appearance of tlie ])laiit very variable. Wlien found in 

 a damp meadow and spreading up a dry hillside, it seems to run into No. 13, 

 in form of leaf and stem. 



Geof/rapliy. — Atlantic States, and west to the Pacific. It loves damj) 

 ground, but is fr('(iuoiitly found on the lower edges of hillsides. 



17. R. rhomboideus, (ioldio. (Rhomboi<lleaved Crowfoot.) Stem 3 to (i 

 inches high, much braiuliod, liairy. Leaves at tlie root, on long stalks, rliom- 

 boid-ovate, crenate-dentate ; stem leaves l)elow similar, 3-.5-lobeil, up])er ones 

 nearly se.'^sile, lobes linear. Flowers deep-yellow. Petals larger than the 

 sepals. Carpels globular, beak small, head spherical. April to May. 



Geofp-aphi/. — Micln'gan, 111., Wis., southwest to Colorado, and north to 

 British America. 



18. R. sceleratus, ]j. (Wicked Crowfoot. Celery-leaved Crowfoot. Cursed 

 Crowfoot.) Stem thick, hollow, 10 to 15 inclies high, glabrous, and branched. 

 Leaves at the base 3-lobed, long-petioled ; lobes divided, those on the lower 



