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. Pl. 556. 1753. 
Fe. aquatilis var. heterophyllus DC. Prod. 1: 26. 1824. 
Le. aquatilis var. hispidulus DREw, Bull. Torr. Club, 16: 
150. 1889. 
fe. Grayanus FrRrEyN, 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 Bosscu. Prod. Fl. Bot. 5. 1850. 
Ranunculus trichophyllus Cuatx. in Vill. Hist. Pl. Dauph. 
E435. 17S6. 
mn feccdus PERS. in’ Usteri. Ann: Bot. 5): pt. 14:30. 
£795° 
Mea panlornrin BROT. ex DC. Syst. 52 235. 1818. 
fe. aquatilis var. cespitosus DC. Prod. 1: 26. 1824. 
LP. aquatilis var. brachypus Hoox. & ARN. Bot. Beech. 
316. 1841. 
fe. confervoides FrRiES, Sum. Veg. Scand. 1: 139. 1846. 
Le. aquatzlis var. submersus GORDON, in Gren. & Godr. 
BI Brig: 2326 248. 
Le. aquatilis var. trichophyllus Gray, Man. 5 ed. 40. 1867. 
wt: Portert BRiTToN, Bull. Torr. Club, 27: 310: 1890. 
Pe. aquatilis var. confervoides GRAY, Syn. Fl. 1:21. 1895. 
fe. aquatilis var. flacctdus GRAY, |. 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 ‘may be rigid when taken from the water. 
The plants have adapted themselves to either aquatic or to 
muddy habitats. Widely distributed; America, Europe, Asia. 
