80 ROSACEA. (ROSE FAMILY.) 



somewhat glaucous : leaflets oblong-ovate, cut-serrate, whitish-downy under- 

 neath, the lateral ones sessile : petals as long as the sepals : fruit light red. — From 

 New Mexico and Colorado northward to British America and thence eastward 

 to the New England and Middle States ; also in Nevada. 



6. R. oecidentalis, L. (Black Raspberry. Thimbleberry.) Glau- 

 cous all over: sterns recurved, armed like the stalks, etc. ivith hooked prickles, 

 not bristly : leaflets 3, ovate, coarsely doubli/ szrrate, whitened-downy under- 

 neath, the lateral ones somewhat stalked : petals shorter than the sepals : fruit 

 purple-black. — From Oregon eastward to Missouri and thence throughout the 

 Eastern States, especially to the north. 



8. PURSHIA, DC. 



Calyx funnel-shaped. Petals exceeding the calyx-lobes, yellow. Stamens 

 about 25, in one row. Carpels sometimes 2, narrowly oblong. Fruit pubes- 

 cent, attenuate at each end, exserted. — Diffusely branched : leaves mostly 

 fascicled, cuueate : flowers terminal on the short branchlets. 



1. P. tridentata, DC. Usually 2 to .5 (rarely 8 or 10) feet high, with 

 brown or grayish bark ; the young branches and numerous short branchlets 

 pubescent : leaves cuneate-obovate, 3-lobed at the apex, petioled, white-tomen- 

 tose beneath, greener above : calyx tomentose with some glandular hairs • 

 petals spatulate-obovate. — Arizona and New Mexico, and northward through- 

 out the Rocky Mountain region to the British boundary; westward to the 

 Sierras. 



9. COLEOGYNE, Torr. 



Calyx with a membranaceous margin, colored within. Stamens numerous, 

 inserted upon the base of a tubular torus which includes the ovary. Style 

 lateral, very villous at base, twisted, exserted, persistent Fruit glabrous, in- 

 cluded. — Diffusely branched, somewhat spinescent : leaves coriaceous : flowers 

 terminal on the short branchlets, subtended by 1 or 2 pairs of 3-lobed bracts, 

 yellow, showy, 



1. C. ramosissima, Torr. The short rigid branches opposite and spines- 

 cent; bark gray: leaves approximate upon the branchlets, linear oblauceolate, 

 puberulent with appressed hairs attached by the middle : tube of the torus 

 membranaceous, dilated below and narrowed to the shortly 5-toothed apex, 

 densely white-villous within : akene somewhat compressed, the obtuse apex 

 incurved. — PI. Frem. 8, t. 4. From S. Colorado to Arizona and Nevada, and 

 in California. 



10. CERCOCARPUS, HBK. Mountain Mahogany. 



Stamens 15 to 25, in 2 or 3 rows on the limb of the calyx. Fruit coria- 

 ceous, linear, terete, villous, included in the enlarged calyx-tube. — Leaves 

 evergreen. 



1. C. ledifolius. Nutt. A shrub or small tree, 6 to 15 feet high: leaves 

 narrou'hj lanceolate with m.argins more or less revolute, thick-coriaceous and 

 somewhat resinous, entire, more or less tomentose, but glabrous above, acute : 



