Davis : RANUNCULI OF NORTH AMERICA. 461 



petals several-nerved, deciduous : styles subulate, as long as the 

 ovaries, stigma surface along the inner side : receptacle hairy. 

 July. Chihuahua, Mex., Texas to British Columbia, eastward 

 and northward to Hudson Bay. Also in Europe. 



2. B. aquatile WIMM. Fl. Schles. 8. 1841. 

 Ranunculus aquatilis LINN. Sp. PI. 556. 1753. 



R. aquatilis var. heterophyllus DC. Prod. I : 26. 1824. 

 R. aquatilis var. hispidulus DREW, Bull. Torr. Club, 16 : 



150. 1889. 

 R. Grayanus FREYN, Deutsche Bot. Monats. 8: 179. 



1891. 



Floating leaves round-reniform, 3-5-lobed or parted, and 

 the divisions 2 3-cleft ; submersed ones with filiform segments, 

 widely spreading, rather firm, but collapsing when taken from 

 water ; all the leaves often slightly hispid below : styles sub- 

 ulate, shorter than the ovaries, introrsely stigmatose : recep- 

 tacle hairy among the carpels. Ponds and quiet shallow 

 streams. California to Alaska, Europe and Asia. 



3. B. trichophyllum BOSSCH. Prod. Fl. Bot. 5. 1850. 

 Ranunculus trichophyllus CHAIX. in Vill. Hist. PL Dauph. 



i: 335. 1786. 

 R. jlaccidus PERS. in Usteri. Ann. Bot. 5 : pt. 14 : 39. 



R. pantothrix BROT. ex DC. Syst. i : 235. 1818. 



7?. aquatilis var. ccespitosus DC. Prod. I : 26. 1824. 



R. aquatilis var. brachypus HOOK. & ARN. Bot. Beech. 



316. 1841. 



R. confer-voides FRIES, Sum. Veg. Scand. 1 : 139. 1846. 

 R. aquatilis var. submersus GORDON, in Gren. & Godr. 



Fl. Fr. i : 23. 1848. 



R. aquatilis var. trichophyllus GRAY, Man. 5 ed. 40. 1867. 

 R. Porteri BRITTON, Bull. Torr. Club, 17: 310. 1890. 

 R. aquatilis var. confervotdesGRAY, Syn. Fl. 1:21. 1895. 

 R. aquatilis v&r.Jlaccidus GRAY, 1. c. 21. 



This species is polymorphous, including those with filiform 

 segments to all the leaves or with some of the leaves rather 

 fleshy, or some narrowly linear, and the submersed leaves are 

 mostly flaccid, but ^ay be rigid when taken from the water. 

 The plants have adapted themselves to either aquatic or to 

 muddy habitats. Widely distributed ; America, Europe, Asia. 



