Banunculus. UANLNCL'LACE.E. 31 



reductiou to one species and the admission of 35, pruluiljlv tlic 1k.-Uit elioi<-e is Uj 

 admit the following tiloiig with Ji. Jiuitans, Lum., and thus preserve the earliest 



names. 



* Styles subulate, nut loii^r,-r tliaii tlio ovary, iutmrsciy Mlif,'iii:it..s.^ f..r pari ..r :ill <.f their 



length : petals deciduous. 

 H- Carpel-receptacle more or less hairy : submersed (■ai)ilhiry-niultilid folia^'e always 

 preseut, oftener no other in American jdants: petals several-nerved.— A', w/uulihs, L. 



R. circinatUS, Siuxn. Wholly sul)mersed and destitute of emersed foliaf^e: leaves seswilc 

 (down to the very sliort stipular-dilated base) and dissecte<l into rigid lobes, all spreading in 

 one plane (at riglit angles to stem) in an orl)icular outline of about an indi in diameter, not 

 at all collapsing when drawn out of water : style as long as tlie ovary, stigmat^)se above, n<.t 

 rarely persisting as a subulate beak. — Fl. Oxon. 175 ; Eng. Bot. Sui)pl. iv. t. 28G'J ; Ueichenl*. 

 Ic. Fl. Germ. iii. t. 2; Fl. Dan. t. 22.36. R. af/uatilis, /3, L. Spec. i. 55G, in part; Sciik. 

 Ilandb. t. 152. R. stafjnatalis, Wallr. Sched. Crit. 285. R. rhjidus, Uutli. En. I'l. Pba:uog. 

 Germ. i. sec. 2, 633. R. dicuricatus, Kocii in Sturm, Deutsch. Fl. xvi. Heft 67, &c. (not, 

 it is said, of Schrank, nor of Ma-uch) ; Godroii, Ess. 27, f. 7 , Gray, Man. cd. 5, 40, & PI. 

 Wright, ii. 8. R. aquatUis, var. divaricatus, Gray, Man. ed. 2, 7. R. lunyuostris, Godron, 

 1. c. 32, f. 9. R.aquatilis,\aT. hmjiroslris, Lawson, 1. c. 43. /Jiilracluum c'n'inntum, Spach, 

 Hist. Veg. vii. 201 ; Fries, Herb. Norm. 1842, &c.i — In still water, Gauada and Hudson liay 

 to Brit. Columbia, and W. Texas, but mainly northeastward. (Eu.) 



R. aquatilis, L. Leaves pctioled ; the emersed ones present in the type, renifonn or orbicu- 

 lar, 3-.")-lobed or sometimes parted and tlie divisions 2-3-cleft : sultmersed ones dissected 

 into eitlier filiform or capillary divisions, wliich are widely spreading, usually of rather tirin 

 texture, or else flaccid so as to collapse when drawn out of water : style short. — Spec. i. 

 556, &c. The typical form is var. HKTEROrnYLLUS, DC. Frodr. i. 26 (/i. ui/uutilis, DC. 

 Sys't. i. 234, R. heterophjlUis, Weber, Fries, &c.) ; Hook. Fl. Bor.-Am. i. 10; Gray, .Man. od. 

 5^ 40..2 — Growing in shalbjw waters, in this country only from Alaska and the a<ijacent 

 islands (where taken by Schlechteudal for R. hedema'us) to Oregon and California. (Eu., 

 Asia.) 



Var. trichophyllus, Gu.w, 1. c. All the leaves di.ssected : tlie most available 

 name for the collective forms [R. pantothnx, Brot in DC. Syst. i. 235); l>ut used in 

 restricted sense for tliose witli rather sliort and slightly rigid leaves, whicli do not collap.<;e 

 on withdrawal from the v>a.ter. — R. tric/iophj/llus, Chaix in Vill. Fl. Daupli. i. 335, & 7.'. 

 divaricatus, Schrank, Baiersclie Fl. ii. H)4,Jide Hiern.8 Var. nuAenvpus, Hook. & Arn. Bot. 

 Beech. 316, with peduncle shorter tliaii tlic leaf, is the commoner form of this in California.* 

 "Var. C/KSI'1t6sus, DC. Prodr. i. 26, is a dwarf and coinlenscd form, boconiing terrestrial ; 

 the leaves becoming somewbat fleshy or rigiil. Var. coNKKKVofuES (A', con/firoides, Frie.o, 

 Sum. Veg. Scand. i. 139) is aTlwarf form with capillary flabby leaves, found only north- 

 ward. Var. flAccidls (A. flnccidus, I'ers. in Usteri, Ann. Bot. v. pt. 14, 39), with soft 

 cai)illary dissected leaves, collapsing on withdrawal from the water : New England, New 

 York, &c., commonly a large form, in rather deep water, with longer or le.-js numerous leaf- 

 divisions : answering to A. aquatilis, var. submersus, Godron in Cireu. & Godr. Fl. Fr. i. 23, 



1 Add syn. Batrachium divmicatum, Britton, Mem. Torr. Club, v. 160, not Wimm. (wbi.-li Wing 

 R. divaricntus, Schrank, was, ace. to Hieni, a fomi of the plant here called lianuncultu nyipiti/M, vnr. 

 trichophyllus). 



2 Add syn. A. Grnynntis, Freyn, Deutsche Bot. Monat.sschr. viii. 179, and A. wiuatihs, var. his- 

 pididiis. Drew, Bull. Torr. Club, xvi. 150. The hispid character of the lower surface of the eniei-swi 

 leaves is a very general one both in European and American specimens, and is in no wise restricted to 

 plants with trifid leaves. 



8 Add syn. Batrachium trichnphyllum, Roscb, Prodr. Fl. Bat. .1. 



* R. Porteri, Britton (Bull. Torr. Club, xvii.310). known from iniiierfect specimens, appears to 1k) 

 hut 11 form of the same polymorphous species. Its akenes are three fourths line in .liamet^r and iU 

 leaves are dissected, .some into narrowly linear, others into lilifomi segments. If a form of this si>ecio9 

 it may also be placed between vars. caspHo.tus and Iricho/dri/llii.';. 



