186 



ROSACEA. [Potentilla. 



erali donata, in receptaculo procumbente persistente exsucco capiuito. Semen appensuiu. 

 Herbse aiit snffrutices, foUis compositis, stipulis petiolo adnaiis, florihus albis luteis ranter 



ruhris. DC. 



* Foliis pinnatis* ' 



1. P.fmticosa; caule fruticoso, foliis piniiatis, foliolis oblongo-lanceolatis integerrimis, 

 petalis calyce longiorlbus.— imw. Sp. PL p. 709. Mich. Am. p. 304. Engl Bot t 88. 

 Pursh, PL Am. v. \. p. 355. 'NestL Monogr, Pot p. 30. t. 1. / a. Lehm. Monogr. 

 Pot. p.%\. Torrey, PI. ofUn. St. v. I. p. 498. De Cand. Prodr. v. 2. p. 579. EicL in 

 FrankL IstJourn. ed. 2.App. p. 20.— 7. foliis angustioribus densissime pilosis cinereis. Lehm. 

 Monogr. Pot. p. 32. De Cand. Prodr. v. 2. p. 579.— P. fruticosa, /3. NestL Monogr. Pot. p. 

 30.— P. tenuifolia. Consp. Pot. Herb. Willd. in Mag. der GeselL Natur. Freunde in Berlin 

 Jahrg. 7. p. 285.— P. floribunda. Pursh, PL Am. v. 1. p. 355. BigeL Fl. Bost ed. 2. p. 203. 



Hab. Throughout Canada, from Lake Huron (rar. y., 2)r. Todd) to the plains of the Saskatchawan and 

 Bear Lake Rivers under the Arctic Circle {Dr. Richardson), and from Newfoundland {Dr. Morrison) to the 

 valUes of the Rocky Mountains, on both sides. Douglas, Drummond, Kotzehue's Sound in Behring's 

 Straits. Lay and Collie. 



2. P. arguta; caide erecto pubescente superne viscoso, foliis impari-pinnatis, foliolis sub- 

 rotundo-ovatis basi obliquis duplicato-inciso-dentatis, stipulis subintegerrimis, calycibus 

 acutis corolla subbrevioribus. (Tab. 'LXlll.)—Pursh, Fl. Am. v. 2. p. 736, (fideexempl. 

 Bradbury, Rich.) Rich, in FrankL \st Journ. ed. 2. App. p. 20. LindL in Bot. Reg. 1. 137. 

 —P. confertiflora. Torrey^ Fl. of Un. St v.\. p. 499.— P. obliqua. Douglas, MSS. apud 

 Hort Soc. Lond.—V. ferruginea. ejusd. in Herb, nostr. — Boottia sylvestris. BigeL Fl. Bost 

 ed. 2. p. 206. — Geum agiimonioides. Pursh^ Fl. Am. v. \. p. 351. 



Totaplanta pubescens, junior glauduloso-viscosa. Caules ex eadem radice plures, erecti, teretes. 

 fistulosi, 1-3-pedales. Folia impari-pinnata, radicalia longe petiolata, caulina breviter petiolata, summa 

 ternata subsessilia. Foliolal-\\, opposita vel subopposita, stiperiora sensira majora, brevissime petiolata, 

 subrotundo-ovata, basi obliqua grosse inciso-dentata, incisuris superioribus duplicatis. Stipulm ovatse, acutse, 

 inferiores integerrimre, sitperiores subincisse. Flores erecti, plus mlnusve pedicellati, in summo caule pani- 

 culam subdichotomam confertam constituentes. Calyx villoso-viscosus, (sub 5-angulatus,) foliola exteriora 

 lanceolata, acuta, reliquis minora, interiora oblonga, acuta, subintegerrima : tubo subhemisphaerico concavo, 

 ore staminifero. Petala pallide flava, rotundato-obovata, integerrima, calyce long^ora. Stam. sub-25 basi intus 

 annulo nectariformi cincta. Meceptaculum villosum, [subsphsericum demum elongatum camosum, fere ut in 

 P. palustri. Ovaria ovata, palhde rosea : stylo infra medium margine interiore inserto, subulato, flavo, car- 

 noso, paululum glanduloso. Stigma acutuia. ^c7^e7^m ovata,l3evia, glabra, stylo persistente laterali donata. ff.] 



Hab. Woody country, as far as lat. 65*^, north, and westward to the Rocky Mountains, on both sides of 

 the " Dividing Ridge." Dr. Richardson, Drummond, Douglas. Fort Vancouver, on the Columbia. Dr. 

 Scouler, Douglas.— I had long ago received beautiful specimens of this plant from Dr. Boott, gathered m the 

 neighbourhood of Boston, as the Geum agrimonioides of Pursh, an acknowledged Potentilla, but which Mr. 

 Lindley, who has examined an original specimen, " beheves to be distinct," while Dr. Richardson says, " forsan 

 hujus (P. argut<B) varietas, foliolis temis ultimis subrotundis, proportionatim minoribus." In the year 1 824, the 

 plant was published by Dr. Torrey, in his Flora of the Northern and Middle of the United States, as P. con- 

 fertiflora, and by Dr. Bigelow, in his Florula of Boston, as a new genus, under the name of Boottia, the 

 character of which consists in a " nectary forming a stellated cavity around the receptacle of the germens, 

 having pits in its five points opposite the narrow segments of the calyx." These pits or cavities are very 

 inconsnicuous. and are little more than a denression in each of the sinuses of the five larger segments of the 



striad. 



