to the Rocky Mountains. 205 



bus pentandris, bracteatis ; petalis angustissimis ; staminibus 

 non exsertis. 



Desc. Root large, perennial. Leaves forming a tuft about the root, 

 petiolate, roundish-cordate, about three-fourths of an inch in diameter, un- 

 equally incised and serrate, somewhat coriaceous, smooth on both sides ; 

 petioles 1-2 inches in length, slightly pubescent, semiterete ; stipules subu- 

 late, carious. Scape 3-6 inches long, slender, naked, terete, subpubescent. 

 Flowers in a spiked raceme, about an inch long, pedicellate ; the pediceli 

 furnished with lanceolate bracts, 1-2-flowered. Calyx campanulate, equal, 

 glandularly-pubescent, deeply 5-cleft ; the segments obovate, obtuse. Pe- 

 tals 5, linear, very narrow, inserted between the segments of the calyx, 

 which they scarcely exceed in length, persistent. Stamens 5 ; filaments 

 shorter than the calyx, and inserted opposite their segments, smooth, subu- 

 late ; anthers oblong, 2-celled, yellowish. Styles 2, distinct to the base, 

 smooth, tapering, rather longer than the stamens ; stigma simple. Capsule 

 semi-inferior, birostrate, opening between the beaks, 1-celled. Seeds mi- 

 nute, numerous, ovate, corrugated, affixed to two lateral placentae. 



Hab. On the Rocky Mountains. 



Obs. A remarkable species, having the appearance of a 

 Saxifraga. It differs from Tiarella in its pentandrous brac- 

 teate flowers, and from Heuchera, in its distinct styles, as well 

 as in habit. It should, perhaps, form a distinct genus. 



169. Hydrangea vulgaris, (3. cordaia. H. cordata, 

 Purshji. i. p. 309. On the Missouri, above St. Louis. Dr. 

 Baldwin. 



CRASSULACE^E. 



170. Sedum stenopetalum, Purshji. u p. 324. On the 

 Rocky Mountains. 



171. S., n. sp. Nutt. Near the Rocky Mountains. Leaves 

 roundish, flat, entire, scattered; cymes terminal, trichotomous. 



172. S. lanceolatum, foliis planis, subalternis, inferiori- 

 bus confertis, oblongo-lanceolatis, acutiusculis, glabris, mar- 

 gtne glanduloso-serrulatis ; caule ramoso, assurgente ; flori- 

 bus cymoso-corymbosis ; petalis lanceolatis, patentibus. 



