KANUNCVLACE^E. (CROWFOOT FAMILY.) 43 



heads; petals scarcely exceeding the calyx. Wet ditches; appearing as if 

 introduced. June -Aug. Stem thick and hollow. 1 high; juice acrid and 

 blistering ; leaves thickish ; flowers small, pale yellow. (Eu.) 



++ -M- Leaves variously cleft or divided ; achenes in globular heads (except n. 17), 

 compressed, with an evident Jinn margin; hirsute or pubescent. 



= Achenes with long recurved beak; root-leaves rarely divided. 



13. R. recurvatUS, Poir. (HOOKED C.) Hirsute, 1-2 high; leaves 

 of the root and stem nearly alike, long-petioled, deeply 3-cleft, large; the lobes 

 broadlv wedge-shaped, 2-3-cleft, cut and toothed toward the apex; petals 

 shorter than the reflexed calyx, pale. Woods, common. May, June. 



= = Style long and attenuate, sfigmatose at the tip, persistent or the upper part 

 usually deciduous; early root-leaves only 3-parted, the later 3 - 5-foliolate ; 

 petals bright yellow. 



14. R. fascicularis, Muhl. (EARLY C.) Low, ascending, 5-9' high, 

 pubescent with close-pressed silky hairs ; root a cluster of thickened Jieshy Jibres ; 

 radical leaves appearing pinnate, the long-stalked terminal division remote from 

 the sessile lateral ones, itself 3-5-divided or parted and 3-5-clel't, the lobes 

 oblong or linear ; petals ofteu 6 or 7, spatulate-oblong, twice the length of the 

 spreading calyx ; carpels scared ,/ margined, tipped with a slender straight or 

 rather curved beak. Dry or moist hills. April, .May. 



15. R. septentrionalis, Poir. Low, hairy or nearly glabrous; stems 

 ascending, or in >c< t </''<"""/ mi<i' <>f t/n m procumbent or forming lung rttnm rs ; 

 leaves 3-divided, the divisions all stalked (or at least the terminal one), broadly 

 wedge-shaped or ovate, unequally 3-cleft or parted and variously cut, never 

 pinnately compound ; petals obovate, much larger than the spreading calyx; 

 carpels strom/h/ margined, pointed by a stout straightish beak. (R. repens, of 

 Manual, mainlv.) Moist or sliadv places, etc., May -Aug. Extremely 

 variable in si/.e and foliage, commenciug to (lower by upright stems in spring 

 before any long runners are formed. 



= = = St;/Ie subulate, stigmatose along the inner margin, mostly persistent. 



16. R. repens, L. In habit and foliage closely similar to the last spe- 

 cies; leaves frequently white-variegated or spotted; commencing to flower 

 somewhat later. In low grounds ; generally in waste grounds near the coast 

 and probably introduced from Europe, but indigenous westward. 



17. R. Pennsylvanicus, L. f. (BRISTLY C.) Stout and erect from a 

 usually annual root, hirsute with widely spreading bristly hairs, leafy to 

 the top, 1-2 high; leaves all ternately divided or compound, the stalked 

 leaflets unequally 3-cleft, sharply cut and toothed, acute ; flowers inconspicu- 

 ous ; calyx reflexed ; head of carpels oblong. Wet places, common. June - 

 Aug. 



18. R. hispidus, Hook, (not Michx. or DC.). Resembling the last, but 

 the ascending or reclining stems few-leaved, rarely if ever rooting, not always 

 hirsute ; petals (about 3" long) surpassing the hardly reflexed and soon decid- 

 uous calyx ; achenes with a stout straight beak, in a globose or oval head. 

 On the northern shore of Lake Superior, and north and westward ; probably 

 in N. Minn. 



