186 SUMMEK FLOWERS. 



glabrous, the stem hollow ; lower leaves stalked, three-parted 

 with obtusely-lobed segments, the upper sessile, trifid with 

 narrow segments ; flowers small, numerous, pale yellow ; car- 

 pels very small and numerous, in a dense oblong head. Wet 

 places, sides of pools, etc. Fl. July to September. 



Leaves hairy. 



B. acris : stems erect, six inches to 2-3 feet high, hairy ; 

 leaves stalked, palmately three-parted, the segments again cut 

 into three acutely-toothed lobes, those of the upper ones nar- 

 rower and fewer; flowers rather large, bright yellow, forming 

 large loose panicles, the calyx lobes spreading horizontally; 

 carpels ovate, glabrous. Buttercups. Meadows and pastures. 

 Fl. June, July. 



B. repens : distinguished by having creeping runners, and 

 spreading calyx-lobes; and 



B. bulbosus : known by the bulbous base of its stem, and 

 by its reflexed calyx-lobes both noticed at p. 43 are also 

 met with in flower during summer. 



JJ Carpels slightly tulerculate near the edge. 



B. Philonotis (hirsutus) : annual, erect, much branched from 

 the base, |-1 foot high, hairy ; leaves ternate, with stalked 

 trifid leaflets ; flowers numerous, rather small, pale yellow, the 

 calyx-lobes reflexed ; carpels marked with minute tubercles 

 within the margin. Moist fields and waste places. Fl. July 

 to October. 



+tt Carpels covered with prickles. 



B. arvensis : annual, erect, branching, nearly glabrous, pale 

 green, \-\\ feet high ; leases once or twice deeply three-cleft, 

 with narrow segments ; flowers small, pale yellow ; carpels 

 few, rather large, much flattened, covered on both sides with 



