438 ROSACEiE. Potentilla. 



teolar calyx-segments very small. Receptacle villous. Achenia very gla- 

 brous. — The var. y. of which Mr. Nuttall collected but a single specimen, 

 not (juite in flower, will probal)ly prove to be a distinct species, as the dis- 

 coverer supposes. 



~ 6. P. Pennsylvanica (Linn.): stem erect, softly tomentose or rather vil- 

 lous ; leaves pinnately 5-9-foliolate, canescently tomentose, as also the pe- 

 duncles and calyx ; leaflets oblong, obtuse, pinnatifid or pinnately incised ; 

 the superior ones larger, often confluent at the base, and mostly crowded ; 

 the inferior pair often very small ; stipules entire or incised ; cyme at length 

 dichotomous and exjianded, fastigiate ; petals ruundish-obovate, emarginate, 

 slightly exceeding the ratlier acute segments of the calyx. — Linn.! mant. p. 

 76"; Jacq. hort. Vindoh. 2. /. 189 ; Willd.! spec. 2. p. 1099 ; Mkhx. ! fl.l. 

 p. 304 ; Pursh,Jl. I. p. 356. 



a. communis : leaflets almost glabrous above when old, with elongated 

 lanceolate rather spreading lacinife ; the lowest ones rather distant, very 

 small, entire or toothed. — P. Pennsylvanica, Lelim. ! Pot, p. bb, Sf in. Hook. 

 I. c. 1. J}. 188 ; and of autliors. P. Missourica, Hornem. ; Bot.reg. t. 1412. 

 1/ p. strigosa (PuTshl) : smaller ; leaflets mostly tomentose on both surfaces, 

 deeply pectinate-pinnatifid ; the segments linear, with revolute margins, en- 

 tire; stipules laciiiiate. — P. pectinata, Fischer. P. absinthiifolia, X?o(/oL .' 

 mss. P. holosericea, Niitt. ! mss. P. Pennsylvanica, 0. strigosa, Lchm. ! I. c. 



y. bipinnatifida : leaflets crowded (3-5) and often almost palmate, deeply 

 pinnatifid (silky-pubescent but not canescent above) ; the segments linear, 

 elongated, mostly spreading. — P. bipinnatifida, Dougl. ! in Hook. I. c. P. 

 arguta, Lehm. ! i. c, not of Pursh. 



i. pulchcrrima: leaflets much crowded (the lower minute ones wanting), 

 elliptical-oblong, pinnalifid-serrate, with lanceolate-oblong scarcely spreading 

 teeth (silkv-pubescent or nearly glabrous above) ; stipules mostly entire. 

 —P. pulcherrima, Lehm. I I. c. 



e. H'ppiana : leaflets narrowly oblong, approximate but scarcely crowded 

 (silky above, silvery-canescent beneath), pinnatifid-serrate ; the teeth slightly 

 spreading, connivent when young ; stipules ovate or lanceolate, entire or 

 somewhat toothed. — P. Hippiana, Lehm.! stirp. pvg- 2. p. 7, 8f in Hook. 

 I. c, t. 64. P. leucophylla, Torr. ! in ami. bjc. NewYork, 2. p. 197, not of 

 Pallas. P. dealbata, Dougl.! mss. not. oi Led eh. 



Canada! and throughout British America to Kotzebue's Sound ! Also a 

 native of Siberia; but not found within the limits of the United States east 

 of the Mississippi. /?. Rocky Mountains to lat. 42°, Nuttall! On the Mis- 

 souri, Bradbury ! y. Saskatchawan ! &c. &. & t. Saskatchawan ! and in 

 the Rocky Mountains to the sources of the Platte, Dr. James ! — "We know 

 not whether the botanists who have paid greatest attention to this genus will 

 coincide with our views respecting the species here united with P. Pennsyl- 

 vanica ; but the examination of an extensive series of specimens seems in- 

 evitably to lead to this result. The stems are usually several from the 

 same root, 1-2 feet high. 



7. P. rubricaulis (Lehm.) : stem ascending ; leaves digitate-pinnate ; the 

 radical ones 5-foliolate, the cauline 3-foliolate ; leaflets oblong, approximate, 

 pinnatifid-serrate, glabrous above, tomentose beneath; stipules entire ; petals 

 obcordate, rather longer than the calyx; receptacle somewhat glabrous. 

 Lehm. ! I. c, Sfin Hook. fl. Bor.-Am. 1. p. 191 



About Bear Lake in lat. 66, Richardson. — Stems a foot high, pubescent, 

 purplish. Lacinise of the leaflets linear-lanceolate, obiuse. Segments of 

 the calyx ovate-lanceolate, twice the size of the bracteoles. — We have not 

 examined this species. It appears to be nearly related to P. pulcherrima of 

 ,^he same author. 



