ROSACEAE. 



Vol. II. 



2. Dryas integrifolia Vahl. Entire-leaved Moun- 

 tain Avens. Fig. 2285. 



Dryas integrifolia Vahl, Act. Havn. 4: Part 2, 171. 1798. 

 Dryas tenella Pursh, Fl. Am. Sept. 350. 1814. 



Similar to the preceding species, but the leaves are ovate 

 or ovate-lanceolate, obtuse and often subcordate at the 

 base, obtusish at the apex, entire or with i or 2 teeth near 

 the base, the margins strongly revolute; flowers white, 

 generally slightly smaller; sepals linear. 



" White Hills of New Hampshire," collected by Prof. Peck, 

 according to Pursh, Anticosti, Greenland ; Labrador, west 

 through arctic America to Alaska. June-Aug. 



3. Dryas Drummondii Richards. Drum- 

 mond's Mountain Avens. Fig. 2286. 



Dryas Drummondii Richards.; Hook. Bot. Mag. til.2()72. 



1830. . . 



Dryas octopclala var. Drummondii S. Wats. Bibliog. 



Index I : 281. 1878. 



Sim.ilar to D. octopetala, the leaves crenate-dentate, 

 but generally narrowed at the base. Scape floccose- 

 pubescent, often taller; flower yellow, about 9" 

 broad ; sepals ovate, acutish, black glandular- 

 pubescent. 



On gravel, Gaspe, Quebec ; Anticosti and Labrador, 

 throughout arctic America, south in the Rocky Moun- 

 tains to Montana and to Oregon. June-Aug. 



27. CERCOCARPUS H.B.K. Nov. Gen. et Sp. 6: 232. 1823. 



Shrubs or small trees, with alternate simple petioled coriaceous dentate or entire, stipu- 

 late, prominently straight-veined leaves, and short-pedicelled or sessile, solitary or clustered, 

 axillary or terminal, perfect flowers. Calyx narrowly tubular, persistent, contracted at the 

 throat, 5-lobed. Petals none. Stamens 15-25, inserted in 2 or 3 rows on the limb of the 

 calyx; filaments very short; anthers oval, often pubescent. Ovary i, terete, slender, included 

 in the calyx-tube, ripening into a villous achene ; style filiform, villous, persistent, plumose 



and elongated in fruit; stigma obtuse; ovule soli- 

 tary, nearly erect. Seed linear, its testa membra- 

 nous. [Greek, tailed-fruit.] 



About 10 species, natives of western North America 

 and Mexico. Type species : Cercocarpus fothergilloides 

 H.B.K. 



1. Cercocarpus montanus Raf . Small-leaved 

 Cercocarpus. Fig. 2287. 



Cercocarpus montanus Raf. Atl. Journ. 146. 1832-33. 

 Cercocarpus parvifolius Nutt. ; H. & A. Bot. Beechey 



Voy. 337. 1841. 



A low branching shrub. Leaves obovate or oval, 

 coriaceous, obtuse at the apex, cuneate or some- 

 times rounded at the base, short-petioled, dentate, 

 silky-pubescent or canescent below, sparingly so 

 or glabrous above, 6"-i2" long, 3"-8" broad; flowers 

 axillary, solitary or in pairs, short-peduncled, re- 

 curved, about 3" broad ; calyx-tube pubescent, 4"-6" 

 long, its limb deciduous; style becoming 2'-4' long 

 and very plumose in fruit. 



In dry or rocky soil, South Dakota to western Kansas, 

 Montana, Wyoming, Utah and New Mexico. April-June. 



