26 PLANTS OF MASSACHUSETTS. 



filiform stem, creeping, round, rooting at the joints, with linear 

 and compressed leaves ; plant delicate ; flowers small. June. 



R. repens. L. Creeping Crowfoot. Grows in wet and 

 shaded places, along streams, with flowers often larger than those 

 of R. acris ; is a variable species, being erect or procumbent, 

 often sending out creepers or runners a considerable distance ; 

 leaves generally ternate, deeply cut, often pilose or hairy ; flowers 

 bright yellow, with petals often emarginate, and calyx spreading. 

 May to August. 



R. sceleratus. L. Celery-leafed Crowfoot. Stem smooth, 

 glabrous, branching, succulent, a foot high, with lower leaves in 

 3 segments, and upper ones sessile and cut down, linear and 

 entire ; flowers yellow, numerous in a concave yellowish calyx ; 

 very acrid, and may be used to produce blisters ; grows in wet 

 places, and flowers in June. 



R. Jiammula, L. Small Spearwort. Stem smooth, de- 

 clining, with lanceolate and entire leaves, and small, single, yellow 

 flowers ; in ditches, rare ; found near Boston ; flowers in June, 

 and supposed to be introduced. Big. May be used, like the 

 last, to produce blisters ; but both are liable to create dangerous 

 ulcers. Lind. 



R. aquatilis. L. Water Crowfoot. Stem chiefly under 

 water, creeping, and sending out filiformly dissected leaves at 

 the joints, with 3-6 inches of the end of the stem projecting 

 from the water, bearing fine yellow flowers, and peltate, 3-parted 

 leaves ; in pond-holes ; flowers in June. This corresponds 

 with the plant of this name in Pursh's "Flora," and is a mere 

 variety of the Linnaean species, and is probably the first variety 

 of this plant in the " Flora" of Torrey and Gray, Vol. I. p. 

 16. It may have been included in the following by Professor 

 Hitchcock. 



R. Jiuviatilis. L. River Crowfoot. Stem about a foot long, 

 small, slender, sending out filiform leafets at the joints, floating 



