RANXTNCULACEAE (BUTTKRCUP FAMILY) 199 



Flowers large (petals 5-8 mm. long); stamens many. 



Leaves snort and scarcely collapsing when withdrawn from the 



water ' . ■ . , , ' ^ ■ , , , . ; 2, B. triohophyllum. 



Leaveslonger and coUapsinswhen withdrawn fromthewater . 3. B. flaccidum. 

 Flowers smaller; stamens &-12 . . . . , . . 4. B. oonfervoides. 



1. Batrachitun Ipngirostre |(Godr.) F. Schutz. Arch. Fl. Fr. et Allem. 1: 70. 

 1844. Stem lestfy (the intemddea short): leaves nearly sessile, all submersed; 

 segments numerous, filiform, 12-15 mm. long,.: hardly collapsing when with- 

 drawn from the water; the stipules broad and hairy: peduncles moderately 

 stout, 2-3 cm. long: petals ovate, 5-7 mm, long: achenes in a globose head, 

 distinctly beaked. — Ponds and streams; infrequent in our range, but common 

 eastward. ' ' . 



2. Batrachium trichpphyllum (Ghaix) Bossch. Prod. Fl. Bat. 5. 1850. 

 Wholly, submersed; the stems long (3 dm. or more), with rather long inter- 

 nodes: leaves petioled; their segments short (10-16 mm.), scarcely collapsing 

 when withdrawn from the water; stipules broad, short, hairy: flowers rather 

 large, on stoujish, peduncles bringing them just above the surface: achenes 

 apiculate but not beaked, on a hairy receptacle. — Ponds and streams, fre- 

 quent; across the continent and in Eiirope. 



3. Batracl!;ium flaccidum (Pers.) Rupe. Fl. Cauc. 15. 1869. Scarcely dif- 

 fering from the. preceding except jn the shorter mtefnodes, more numerous 

 lo'nger-petioled leaves, which have logger more slender segments that collapse 

 on being witharawn from the water. — Occurring not only in N. America but 

 in Europe and, Asia. 



4. Batrachium oonfervoides Fries, Bpt.^otiser 121. 1844. Differing from 

 the three preceding in the filiform stem, the very flaccid leaves, the smaller 

 flowers, the few sljEimens, and the conic (not pvoiq) receptacles.— In cold wa- 

 ters; northern Wyoming to Alaska and Lake Winnipeg. 



12. RANUNCULUS L. Buttebcup. Crowfoot 



Mpstlylow perennial herbs, more rarely annual, with leaves varying from 

 entire to divided, parted. pr dissected; those of the stem alternate. Mowers 

 solitary or several in a subcdrymbose cluster. Sepals usually 5. Petals 3-15, 

 witli a, little, scale-covered pit at the base inside, yellow (in some degree), 

 often brbad. an^ conspicuous. Achep.es aggregated in a globular or oblong 

 head, '.usually conipressed; the style often in part (more rarely as a whole) 

 persisting and pointing the' achene. , , 



AMPHIBIOUS AQUATICS, the submersed leaves, if any, 

 . capillary-multifid. 



Leaves orbijcular in outline, multifid or many-toothed OF lobed , 1. R. Furshii. 

 L^ves "reruform, 3-lobed . ' , , , , , , , 2. R. natans. 

 MARSH PLANTS, perennial by creeping stolons . . . 3. R. reptans. ' 

 TERRESTRIAL. PERENNIALS, often growing in wet places. 

 All the leaves entire . -. k ,, . . . ; •,, > ., • • ■ 4. R, calthaeflorus. 

 Some of the, leaves entire, . , , • ' • • • .5. R. glaberrimus. 

 None of theleaves entire. ■ ' ' ■ ' n ^ 



Some or aQ of the radical merely crenate-dentate, not divided 

 or parted., , , , , 



Achenes glabrous, in a globose head. 

 ' Sepals densely -villous with brown hair' ■ • • • 6. R. Macauleyi, 



Sepals glabrate or ciliate-pubescent. 

 * , -. ; Radical leaves reniform-cordate . • i« • • 7. R. abortivus. 

 ^ ' Radical leaves ovate or suborbici^ar • '• • . S. R. ovalis. 

 Achenes pubescent, ih an <)bl6ng head. * 



Fetiulg small, spatulate-oblong . , • ' : • ' • • . 0. R. inamoenus; 

 Petals large, obovate-suborbicular • , ... . 10. R. ci^rdiophyllus.' 

 Most' of the ra;dical cleft to the middle or below. 

 Head of^carpels elliptic or oblong. 



Achenes pubescent .....•*. 11. R. pedatifidus. 

 ; Achenesrglabrous ■ . . ; , . . ,, • . «,. .12. R. alpeophilu^. 

 Head of achene's' globose ... • • .' . .13. R. pygiiaaeus. 

 All of the leaves deeply cleft or parted. 



Plants of alpine or subalpine stations, 3-14 cm. high. 

 Flowers small.. 



•Sepals glabrous 14. R. Jovis. 



' ; Sepals villous . . • . , . . . 15. R. Grayi. 



