laterali donata, in receptaculo procumbente persistente exsucco capitato. Semen appensmn.
—Herbse aut suffrutices, foliis compositis, stipulis petiolo adnatis, floribus albis luteis rariter
rubris. DC,
* Foliis pinnatis.
1. P.fruticosa; caule fruticoso, foliis pinnatis,. foliolis oblongp-lanceolatis integerrimis,
petalis calyce longioribus.-—Linn. Sp. PI. p. 709. Mich. Am. p. ,304. Engl. Pot. t. 88.
Pursh, Fl. Am. v. 1. p. 355. Nestl. Monogr. Pot. p. 30. t. 1. f . a . Lehm. Monogr.
Pot. p . 31. Torrey, FI. o f Un. St. v. 1. p . 498. De Cand. Prodr. v. 2. p. 579. Rich, in
Frankl. ls£ Journ. ed. 2. App. p. 20.—y. foliis angustioribus densissime pilosis cinereis. Lehm.
Monogr. Pot. p . 32. De Cand. Prodr. v. 2. p . 579.—P. fruticosa, ß . 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, Fl. Am. v. 1. p . 355. Bigel. Fl. Bost. ed. 2.p. 203.
Hab. Throughout Canada, from Lake Huron (var. y., Dr. Todd) to the plains of the Saskatchawan and
Bear Lake Rivers under the Arctic Circle (Dr. Richardson), and from Newfoundland (Dr. Morrison) to the
vallies of the Rocky Mountains, on both sides. Douglas, Drummond. Kotzebue’s Sound in Behring’s
Straits. Lay and Collie.
2. P . arguta; caule erecto pubescente superne viscoso, foliis impari-pinnatis, foliolis sub-
rotundo-ovatis basi obliquis duplicatordnciso-dentatis, stipulis subintegerrimis, calycibus
acutis corolla subbrevioribus. (Tab. LXIII.)—Pursh, FI. Am. v. 2. p. 736, (fide exempl.
Bradbury, Rich.) Rich, in Frankl. ls£ Journ. ed. 2. App. p. 20. Lindl. in Bot. Reg. 1.137.
—P. confertiflora. Torrey, FI. o f Un. St. v . l . p . 499.—P. obliqua. Douglas, MSS. apud
Hort. Soc. Lond.—P. ferruginea. ejusd. in Herb, nostr.—Boottia sylvestris. Bigel. Fl, Bost.
ed. 2. p . 206.—Geum agrimonioides. Pursh, FI. Am. y. .1. p . 351.
Totaplanta pubescens, junior glanduloso-viscosa. Caules ex eadem radice plures, erecti, teretes, striati,
fistulosi, 1-3-pedaies. Folia impari-pinnata, radicalia longe petiolata, caulina breviter petiolata, summa
ternata subsessilia. Foliola 7-11, opposita vel subopposita, superiora sensim majora, brevissime petiolata,
subrotundo-ovata, basi obliqua grosse inciso-dentata, incisuris superioribus duplicatis. Stipules övafee, acuta;,
inferiores integerrim*, superiores subincis*. Flores erecti, plus minusve pedicellati, in summo caule pani-
culam subdichotomam confertam constituentes. Calyx villoso-viscosus, (sub 5-angulatus,) foliola exteriora
lanceolata, acuta, reliquis minora, interibra oblonga, acuta, subintegerrima: tubo subhemisphaerico concavo,
ore staminifero. Petala pallide flava, rotundato-obovata, integemma, calyce longiora. Stam. sub-25 basi intus
annulo nectariformi cincta. Receptaculwn villosum, [subsph*ricum demum elongatum carnosum, fere ut in
P. palustri. Ovaria ovata, pallide rosea: stylo infra medium margine interiore inserto, subulato, flavo, car-
noso, paululum glanduloso. Stigma acutum. Achenia ovata, he via, glabra, stylo persistente laterali donata. H.]
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 in the
neighbourhood of Boston, as the Geum agrimonioides of Pursh, an acknowledged Potentilla, but which Mr.
Lindley, who has examined an original specimen, “ believes to be distinct,” while Dr. Richardson says, " forsan
hujus (P. argutee) varietas, foliolis ternis ultimis subrotundis, proportionatim minoribus.” In the year 1824, the
plant was published by Dr. Torrey, in his Flora of the Northern and Middle of the United States, as P. confertiflora,
and by Dr. Bigelow, in his Florida 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
inconspicuous, and are little more than a depression in each of the sinuses of the five larger segments of the
calyx; while the nectary itself is what exists in most or all of the Potentillce in a greater or less degree; but
is more distinct in our plant than in many others. It is represented in Potentilla, and in the allied genera,
Waldsteinia and Comaropsis, 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 (discus peristomicus) summiim
calycis tubum anrmlatim incrassans.” The insertion of the stamens at the margin of this ring gives the
stellated appearance. In P. rupestris, 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 :’’-r-(see Boottia cor data
in Wallich’s “ Plant* Asiatic* Rariores,” v. 1. p. 52. t. 65.)—Dr. Richardson, by a comparison with the
Lambertian Herbarium, proved our plant to be the same with the arguta of Pursh, (not Lehmann,) which
name is therefore to be adopted. A figure of the species is here given, 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 Potentilla.
Indeed the whole plant bears great affinity with our Potentilla rupestris, from which it cannot
naturally be separated. \H.] ,
Tab. LXIII. Potentilla arguta. Fig. 1, Petal; fig. 2, Section of a calyx and receptacle of pistils; fig. 3,
Front view of a stamen; fig. 4, Back view of do.; fig. 5, Pistil; fig. 6, Receptacle of achenia; 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 solitariis.—Linn. Sp. PI. p. 711. Mich. Am. v. 1. p . 304. Jacq. FI.
Austr. v. 5. t. 406. Pursh, FI. Am. v . l .p . 356. Nestl. Monogr. Pot. p. 38. Lehm. Monogr.
Pot. p. 42. Torrey, FI. o f Un. St. v. 1. p. 498. De Cand. Prodr. v .2 . p. 580.
Hab. Plains of the Saskatchawan. Dr. Richardson, Drummond.
4. P. effusa; incano-tomentosa, caule adscendente debili, foliis interrupte pinnatis,
foliolis oblongis inciso-serratis, floribus dichotome paniculatis, stipulis lanceolatis acuminatis
integerrimis, petalis obcordatis ealyeem acuminatum asquantibus'.—Douglas, MSS.
Radix lignosa, alba, cortice fusco. Caulis subpedalis, adscendens, debilis, teres, in paniculam dichotomam
desinens. Folia radicalia longe petiolata, impari-et interrupte-pinnata, caulina brevius petiolata, summa
sessilia, ternata. Foliola majora 5-9, sessilia, opposita, oblonga, inciso-serrata, serraturis obtusis, utrinque
incano-tomentosa, superiora sensim majora, terminale s*pissime bifidum, minora subcuneiformia, apice 2-3-
dentata. Calyx incano-tomentosus, foliolis exterioribus linearibus minimis, interioribus ovato-lanceolatis,
acuminatis, integerrimis. Petala aurea, obcordata, longitudine calycis. Receptaculum villosum: acheniis
glaberrimis.
Hab. On elevated grounds of the Assinaboyne, and the higher parts of the Red Rivers, plentiful.
5. P . palustris; radice repente, caule adscendente, foliis pinnatis, foliolis lanceolatis
acute serratis, petalis lanceolatis acuminatis calyce multo brevioribus.—Scopol. FI. Cam.
ed. 2. v. 1. p . 359. Lehm. Monogr. Pot. p. 52. Torrey, FI. o f Un. St. v. 1. p. 498. De Cand.
Prodr. v. 2. p. 583.—-P. Comarum. Nestl. Monogr. Pot. p. 36.—Comarum palustre. Linn.
Sp. PI. p. 719. FI. Dan. t. 636. Mich. Am. v. 1. p . 302. Engl. Bot. t. 172. Pursh, FI.
Am. v. 1. p. 356. Bigel. FI. Bost. ed. 2. p . 203. Rich, in Frankl. 1st Journ. ed. 2. App.
p. 21.
Hab. Throughout Canada, and as far north as the Bear Lake. Dr. Richardson, Drummond. Labrador.
Dr. Morrison. Unalaschka, and Bays of Eschscholtz and of Good Hope, in Behring’s Straits. Chamisso.
6. P . Pennsylvania; caule erecto stricto, foliis subinterrupte pinnatis tenuissime tomen-
tosis, foliolis majoribus oblongis truncatis inciso-serratis, minoribus integerrimis lacinias
2 A 2