Potentilla.] ROSACEA. 



187 



calyx ; while the nectary itself is what exists in most or all of the PotentillcB in a greater or less degree j hut 

 is more distinct in our plant than in many others. It is represented in Potentilla^ and in the allied genera, 

 Waldsteinia and ComarqpsiSy in Nestler's " Monographia de Potentilla," t. 1. and is described by the same 

 author in the character of the family 1. c. p. 14. as the " materies staminifera (discxis peristomicus) summum 

 calycis tubum annulatim incrassans." The insertion of the stamens at the margin of this ring gives the 

 stellated appearance. In P. rupestrisy the staminiferous cup is small, but its nature is the same. A splendid 

 new East Indian genus has now been dedicated to Dr. Boott by Dr. Wallich, who, like myself, " is proud to 

 reckon so zealous and excellent a Botanist among the number of his best friends:" — (see Boottin cordata 

 in Wallich*s " Plantie Asiaticae Bariores," v. 1. p. 52. t, 05.)— Dr. Richardson, by a compariaon with the 

 Lambertian Herbai'ium, pi'oved our plant to be the same with the aryuta of Pursh, (not Lcluuauu,) which 

 name is therefore to be adopted. A %ure of the species is here ^ven, and an analysis of the flowers, in 

 order that it may be seen how little the genus Boottia of Dr. Bigelow is in reality at variance with Poten- 

 tilla. Indeed the whole plant bears great afl&nity with our Potentilla rupestris, from which it cannot 

 naturally be separated. [H^ 



Tab. LXIII. Potentilla arguta. Fig. 1, Petal; fg. 2, Section of a calyx and receptacle of pistils; fg. 3, 

 Front view of a stamen; Jig. 4, Back view of do.; fig. 5, Pistil; fig. G, Receptacle of achcnia; figs. 7 

 and 8, Achenia ; fig. 9, Section of an achenium : — magnified. 



3. P. supina; caule decumbente dichotomo, foliis pinnatis, foliolis oblongis inciso-serratis, 

 pedicellis axillaribus soYitaxns.— Linn. Sp. PL jw. 711. Mich. Am. v.\. p. 304. Jacq. 17. 

 Austr. V. 5. t. 406. Pursh, Fl. Am, v. 1. p. 356, Nestl. Monogr. Pot p. 38. Lehm. Monogr, 

 Pot. p. 42. Torrey, FL of Un. St v. 1. p. 498. De Cand. Prodr. v. 2. p, 580. 



Hab. Plains of the Saskatchawan. Dr. Richardson, Drummond. 



4. P. effma; incano-toinentosa, caule adscendeiite debili, foliis interrupte pinnatis, 

 foliolis oblongis inciso-serratis, floribus dichotome paniculatis, stipulis lanceolatis acuminatis 

 integerrimis, petalis obcordatis calycem acuminatum a?c[uantibus. — Douglas^ MSS. 



Radix lignosa, alba, cortice fusco. Caulis subpedalis, adscendens, debilis, teres, in paniculam dichotomam 

 desinens. Folia radicalia longe petiolata, impai-i-et intemipte-pimiata, caulina brevius petiolata, stimma 

 sessilia, temata. Foliola majora 5-9, sessilia, opposita, oblonga, iuciso-sen-ata, serraturis obtusis, utrinque 

 incano-tomentosa, superioia sensim majora, terrainale saepissime biiidum, minora subcuneiforrala, apice 2-3- 

 dentata. Calyx incano-tomentosus, foUolis extenoribus linearibus minimis, interioribus ovato-!auceolatis, 

 acuminatis, integerrimis. Petala aurea, obcordata. longitudine calycis. Receptaculum viUosum : acheniLs 



irrums. 



Red 



adscendente 



acute serratis, petalis lanceolatis acuminatis calyce multo brevioribus.— Scopo/. Fl. Cam. 

 ed. 2.v.\. p. 359. Lehm. Monogr. Pot p. 52. Torrey, Fl. of Un. St v. \.p. 498. De Cand. 

 Prodr. V. 2. p. 583.— P. Comarum. NestL Monogr. Pot p. 36.— Comarum palustre. Linn. 

 Sp PL P' ^19. FL Dan. t 636. Mich. Am. v. I. p. 302. EngL Bot t 172. Purshy Fl. 

 Am. V. 1. p. 356. BigeL Fl. Bost ed. 2. p. 203. Rich, in FrankL \st Joum. ed. 2. App. 



». 21. 



Lake. Dr. Ricliardsony Drumniur 

 f CifUiA TTnnp in Bohriuff's 8traits 



6 P Pennsylvamca ; caule erecto stricto, foliis subinterrupte pinnatis tenuissime tomen- 

 tosis, foliolis majoribus oblongis Uuncatis inciso-serratis, minoribus integerrimis lacinias 



2 A 2 



