tlANUNCULACE^. (cROWFOOr FAMILY.) 43 



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

 iutroduced. June -Aug. — Stem thick and hollow, l°high; juice acrid and 

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



++ ++ Leaves variously cleft or divided ; ochenes 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. reCUrv^tUS, Poir. (Hooked C.) Hirsute, 1-2° high; leaves 

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

 broadly 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, stigmatose at the tip, persistent or the upper part 

 usually deciduous; early root-leaves only 3-parted, the later 3-o-j'oliolate ; 

 petals bright yellow. 



14. R. faseicularis, Muhl. (Early C.) Low, ascending, 5-9' high, 

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

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

 the sessile lateral ones, itself 3 - 5-divided or parted and 3 - 5-cleft, the lobes 

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

 spreading calyx ; carpels scarcely 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 icet ground some of them procumbent or forming long runners; 

 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 strongly margined, pointed by a stout straightish beak. (R. repens, of 

 Manual, mainly.) — Moist or shady places, etc.. May -Aug. — Extremely 

 variable in size and foliage, commencing to flower by upright stems in spring 

 before any long runners are formed. 



= = ^ Style 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-vari-egated 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. 



