1OT,YAN 7 D. POLYGYN. 1/3 



1. R. aquatills (IVater Crowfoot}, stem floating submersed, 

 leaves capillaceo-multifid, floating ones tripartite their lobes cut, 

 petals obovate larger than the cal., pericarps glabrous or hispid. 

 Ligkif.p. 295. E. B.t. 101. 



/3. all the leaves capillaceo-multifid. R. pantothrix, Decand. 

 Syst. Veg. v. \.p. 235. 



HAB. Lakes, ditches, and rivers, abundant. H.May. "I/.. 



This varies in the size and shape of the lobes of the upper leaves, 

 which are generally cuneate, and more or less deeply and obtusely 

 cut and notched, sometimes peltate. The pericarps vary in hispi- 

 dity. I have seen specimens which before the fruit was ripe had very 

 apparent bristles, but were afterwards glabrous. These slight 

 variations taken into consideration, together with a small difference 

 in the size and shape of the petals, seem to have given rise to the 

 R. tripartitus of Decand. and the R. obtusiflorus of D, Don's 

 MSS. incd.; for I can find no other marks whatever. In ]6. all the 

 leaves are repeatedly divided in a di-trichotomous manner, yet 

 gradations of specimens may be found where the one kind runs 

 completely into the other. Sometimes the segments of the dicho- 

 tomies are short and spreading, so as to form a nearly orbicular 

 outline ; at other times they are long and parallel to one another. 

 Decandolle describes the fruit as glabrous, but Mr. G. Don finds 

 the pericarps setoso-pilose, and hence he separates that appearance 

 from R.pantothrix under the name of R. circinnatus, MSS. ined. 

 Species might thus be multiplied without end. 



2. R. hederaceus (Ivy-leaved Crowfoot), stem creeping, leaves 

 roundish kidney-shaped with 3 5 rounded entire lobes, pe- 

 tals small scarcely longer than the cal., stam. 5 10, pericarps 

 glabrous. Ltghtf. p. 294. E. B. I. 2003. 



HAB. Ditches and wet places, but not very common. Moist beds of 

 the Clyde and the Kelvine, which are nearly dry in the summer, Mr. 

 Murray. FL summer. 11 . 



** Pericarps smooth or echinated (not transversely wrinkled). Petals, 

 with a small scale at the base. (Decand.) 



f Flowers white. 



3. R. alpestris (alpine white Crowfoot), leaves glabrous orbi- 

 cular deeply 3-lobed, lobes at the extremity lobulato-crenate, 

 stem mostly I -flowered, petals obcordate. E. B. /.2390. 



HAB. Sides of rills on the Clova mountains, G. Don. FL May. 1J. . 

 Four to five inches high. Leaves almost entirely radical, on rather 



short footstalks ; one generally undivided lanceolate leaf upon the 



stem. Flower entirely white, large. 



ft Flowers yellow. Leaves undivided. 



4. R. Lingua (great Spear-wort), leaves lanceolate subserrated 

 sessile semiamplexicaul, stem erect glabrous. Ughtf. p. 286. 

 E.B. t. 100. 



HAB. Sides of lakes and deep muddy ditches, but not common. Dud- 



