RANUNCULACE^E. ( CROWFOOT FAMILY.) 43 



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

 introduced. June -Aug. Stem thick and hollow, lhigh; juice acrid and 

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

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

 compressed, with an evident firm 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 S-parted, the later 3-5-foliolate; 

 petals bright yellow. 



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

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

 radical leaves appearing pinnate, the 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. K. septentrionalis, Poir. Low, hairy or nearly glabrous; stems 

 ascending, or in wet 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. r&pens, 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. 



