80 ROSACES. (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. occidentalis, L. (BLACK RASPBERRY. THIMBLEBERRY.) Glau- 

 cous all over: stems recurved, armed like the stalks, etc. with hooked prickles, 

 not bristly : leaflets 3, ovate, coarsely doubly serrate, 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, cuneate : 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 spinesceut : leaves coriaceous : flowers 

 terminal on the short brauchlets, 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 oblanceolate, 

 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 

 narrowly lanceolate with margins more or less revolute, thick-coriaceous and 

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



