ICOSANDRIA-POLYGYNIA. Potentilk. 425 



leaves. Cal. most hairy at the base j outer segments ovate^ 

 about as long as the inner, but more leafy. Recept. hairy. 



I have not seen the variety ^, but it should seem to owe its smaller 

 stature to a dry or barren situation. 



The bark of the root is astringent, and hence this plant has found 

 a place in the Pharmacopoeia ; but it is now out of use, there 

 being many more efficacious medicines of the same kind. 



*** Leaves ternate. 



10. P. tridentata. Three-toothed Cinquefoll. 



Leaflets three, wedge-shaped ; smooth above ; hairy be- 

 neath ; with about three terminal teeth. Stem panicled, 

 erect. Seeds even. 



P. tridentata. Soland. in Ait. Hort. Kew. ed. 1 . r. 2. 216, t. 9. ed. 2, 

 V. 3.279. Sm. Tr. of L.Soc.v. 10.343. Engl. Bat. v.34. f.23S9. 

 Comp. 80. Hook. Scot. 163. Willd. Sp. PI. v. 2. 1 1 10, excl. the 

 syn. of Reizius and Fl. Dan. Nesll. Potent. 66, excl. the syn. also 

 of Sibbald, Scot. III. which is certainly Sihbaldia procumbens. 



On the mountains of Scotland. 



On a mountain called Werron, and some other hills in Angus- 

 shire, to the westward. Mr. G. Don. 



Perennial. May, June. 



Root creeping, woody, of a reddish brown. Stems several, herba- 

 ceous, 3 or 4 inches high, round, purplish, hairy, slightly leafy j 

 somewhat corymbose at the top, bearing 3 or 4 elegant white 

 Jloioers. Leaves all ternate ; dark green above ; paler and 

 clothed with close hairs beneath j each leitflet an inch long, 

 rather unequally toothed at the summit, otherwise entire : the 

 radical leaves largest, on channelled footstalks, exceeding their 

 own length. Lower stipulas undivided ; those of the stem-leaves 

 cut. Cal. hairy, purplish, with equal and uniform segments, 

 Pef. obovate, undivided. Recept. and germeiis hairy. Seeds ovsLle, 

 turgid, even and naked, except a tuft of hairs about the top. 



American specimens, gathered by my valued friend Mr. Francis 

 Boott, on the White Mountains of New Hampshire, have 4 or 

 5 teeth to some of their leaflets, but agree otherwise exactly 

 with those from Scotland. P. retiisa, Fl. Dan. t. 799, bear's 

 densely hairy leaves, and yellow flowers ; and has as little affinity 

 to our plant as the likewise yellow Sibbaldia, which, according 

 to Dr. Nestler, this Potcntilla tridentata represents in the herba- 

 rium of Vaillant. Few of the most obscure of its genus have 

 had more unsuitable synonyms. 



1 1 . P, Fragari^strwn. Strawbei'ry-leaved Cinqiiefoil. 



Leaflets tliree, roundish-obovate, serrated, hairy. Stems 

 prostrate. / Seeds corrugated, hairy at the scar. 



