1446 
PURSHIA* tridentata. 
Three-toothed Purshia. 
ICOSANDRIA MONO-DIGYNIA. 
Nat. ord. Rosacex Juss. $ Spireacex De Cand. — (Introduction to 
the natural system of Botany, p. 83.) ; 
PURSHIA De Cand.— Cal. 5-fidus, lobis ovatis obtusis. Pet. 5, orbi- 
culata, et stam. circiter 20 è calyce exserta. Carpella 1-2, ovato-oblonga, 
in stylum brevem attenuata, pubescentia, ovulo 1 basi inserto foeta, demüm 
rimá longitudinali dehiscentia. Frutex ramosissimus, gemmis squamosis, 
foliis confertis cuneatis apice grosse 2-3-dentatis suprà villosis subtús cano- 
tomentosis, stipulis 0 aut minimis, floribus luteis.—De Cand. prodr. 2. 541. 
P. tridentata. De Cand. in trans. Linn. soé. 19. p. 157. Prodr. 2. 541. 
. Hooker fl. boreali americana. E 
Tigarea tridentata. Pursh fl. bor. am. 1. p. 33. t. 15. e 
Frutex, in hortis dumosus, 2-pedalis, ramis teretibus, brevibus, rigidis, 
epidermide divellicante. Folia fasciculata, cuneata, glauca, apice tridentata, 
è gemmis squamaceis erumpentia, suprà pubescentia, ‚subtüs canotomentosa ; 
stipule minime, sepids obsolete. Flores solitarii, in medio fasciculorum 
terminales, foliis breviores. Calyx infundibularis, tomentosus, 5-dentatus, 
dentibus obtusis, patentibus. Petala 5, lineari-obovata, pallidé luteo-viridia, 
incurva. Stamina indefinita, equalia, serie simplici inserta in fauce. Car- 
pella solitaria: v. gemina, tomentosa, simplicissima, ovulis binis v. solitarüs, 
uscendentibus. Stylus terminalis, continuus. Stigma simplicissimum. 
A native of the north-west coast of America, about the 
river Columbia, where it was found by Lewis and Clarke's 
party. Pursh subsequently described it from dried speci- 
mens; but referred it to a-genus of a totally different 
natural order from that to which it really belongs. M. 
De Candolle first pointed out the mistake, with his cus- 
* Named by the learned M. De Candolle after Mr. Frederick Pursh, a 
meritorious Prussian Botanist, who published a well-known Flora of North 
America, in London, in 1814. He died some years since in America: his 
Herbarium now forms part of the vast collection of his friend and patron 
Mr. Lambert. 
