POTK.NTILLA. ROSACE.E. 445 



Nortlicrn hemisphere, and presenting;, in eonsequence, many varieties. Tlie 

 variety from Oregon is extremely large in all its parts ; the pedieels are 

 often a fool long ; and the root is said to be eaten by the natives. — Silver- 

 weed. 



* * Style filiform, inserted helow the middle of the ovary : seed amphitropous 

 or almost orthotropous : carpels and receptacle clothed with very long villous 

 hairs. — Comocarpa. 



31. P. fndkosa (Linn.): slirubl)y, mueh branched; leaves pinnately 

 5-7-foliolate, on short petioles; leaflets crowded, oblong-lanceolate, entire, 

 silky especially beneath; stipules scarious; petals (yellow) nearly orbicular, 

 longer than the calyx. — Linn.! spec. 1. }). 495 ; IVilld. ! spec. 2. p. 1094 ; 

 Mich.v. ! Jl. 1. 1?. 304 ; Nestl. Pot. t. 1 ; Engl. hot. t. 88 ; Pursh ! Ji. 1. p. 

 355 ; Lehm. ! I. c. p. 31 ; DC. ! prodr. 2. p. 679 ; Hook. .' Jl. Bor.-Am. 1. 

 p. 186. P. floribunda, Pursh ! I. c. 



Bog meadows, and along streams, Arctic America ! Newfoundland ! and 

 Kotzebue's Sound ! to Canada ! and the Northern States ! Also along the 

 Rocky Mountains to lat. 42°, Dr. James! June-Sept. — Shrub 2-3 feet 

 liigh, with large flowers terminating the numerous branchlets. Leaves very 

 variable in size. Disk, receptacle, and aclienia extremely villous with very 

 long stiif hairs. 



32. P. tridentata (Ait.) : stems woody and creeping at the base, branched ; 

 flowering stems ascending ; leaves palinately trlfoliolate ; leaflets oblong- 

 cuneiform, 3-toothed at the apex, nearly glabrous and somewhat shining 

 above, pale and minutely pubescent beneath ; stipules lanceolate ; petals 

 (white) obovate-oblong, nearly twice the length of the calyx. — Ait. ! Kew. 

 {ed. 1.) 2. p. 216, t. 9 ,• Michx. ! Jl. 1. 304 ; ^Engl. hot. t. 2389 ; Lehm. ! I. 

 c. ; Torr. ! Jl. 1. p. 495 ; DC. ! I. c. ; Hook. ! jl. Bor.-Am. 1. p. 195. P. 

 retusa, Retz ; Fl. Dan. t. 799, Sf 1875. 



Greenland! Labrador! Newfoundland! and Canada! to the mountains of 

 the New England States ! New York ! and the higher peaks m Virginia and 

 North Carolina, and from Lake Superior ! to lat. 64'^. June-July. — Stems 

 4-10 inches high. Flowers small, few. Acheiiia roundish-ovoid, at length 

 rather sparsely villous. 



* * * Style fusiform, attenuate at the base, fleshy or apparently glandular, 

 large, rather persistent : seed nearly orthotropous : carpels glabrous. — Clos. 



TEUOSTYLES. 



p. rupcstris belongs to this section, but the style is less thickened than in P. 

 arguta. 



33. P. arguta (Pursh) : stem erect, very pubescent, villous and viscid at 

 the summit, "as also the peduncles and calyx ; radical leaves pinnately 7-9- 

 foliolate, on long petioles ; the cauline ones few, 3-7-foliolate ; leaflets round- 

 ish, ovate, or somewhat rhomboid, oblique at the base, incised or doubly ser- 

 rate, pubescent esjjecially beneath ; stipules tootlied or entire ; flowers in a 

 more or less crowded terminal cyme ; segments of the calyx ovate, acute, 

 shorter than the roundish-obovate yellowisli-white petals ; disk glandular 

 thickened, somewhat 5-lohed.— Pursh! Jl. 2. p. 636; Richards.! appx 

 Frankl. journ. ed. 2. p. 20 ; Lindl. ! bat. reg. t. 137 ; Hook.Jl. Bor.-Am. 1 

 p. 186, t. 63. P. conferliflora, Torr. ! fl. 1. p. 449 ; Lehm. ! stirp. pug. 3 

 ^.24. P. Pennsylvanica /?. arguta, Torr.! in ann. lye. New York, 2. p 

 197, not of DC. Geum agrimonioides, Pwrs/i .' ^. 1. ^. 351. Boottia syl- 

 vestris, Bi<rel. ! fl. Bast. ed. 2. p. 351. 



