ROSACES 



491 



coarsely serrate, often irregularly and deeply divided into 2 or 3 acute lateral lobes, 

 3'-3^' long and l^-'-l^' wide, their stipules often f long. Flowers about f in 

 diameter, on short slender pedicels, in compact glabrous few or many-flowered 



compound corymbs; calyx-tube glabrous, the lobes nearly triangular, entire, often 

 bright red toward the apex; stamens 20; anthers small, yellow; styles 5. Fruit 

 ripening toward the end of September, on stout pedicels, in compact drooping clus- 

 ters, globose, \' in diameter, dull vinous red and very lustrous when fully grown, 

 ultimately blue-black; calyx small, with reflexed persistent lobes; flesh thin, yellow, 

 dry and sweet; nutlets 5, thick, rounded and slightly ridged on the back, ' jY 

 long. 



A tree, occasionally 20 high, with a short stem, and long slender spreading 

 branches gracefully drooping at the ends, covered with bright red or reddish brown 

 bark, separating on old trunks near the ground into long slightly attached narrow 

 plate-like gray scales, and slender glabrous bright red lustrous branchlets armed 

 with numerous straight slender spines f'-l' long; often forming clumps or small 

 thickets with numerous stems 8-15 tall springing from a single root. 



Distribution. Banks of the Cimmaron, Gunnison, White, and other Colorado 

 streams on both slopes of the continental divide at elevations of 6000-8000 above 

 the sea. 



XVII. TOMENTOS-S3. 



Leaves thin, with midribs and veins only slightly impressed on their upper surface ; anthers 

 rose color or red. 



Mature leaves pale pubescent below. 



Leaves ovate to ovate-oblong ; fruit in erect clusters, pear-shaped, orange-red ; 

 stamens 20. 121. C. tomentosa (A, C). 



Leaves ovate, oval, or obovate, in drooping clusters, globose to subglobose, bright 

 red ; stamens 10. 122. C. Chapmani (A, C). 



Mature leaves glabrous (slightly pubescent on the midribs and veins below in 123). 

 Stamens 20. 



Leaves elliptical to suborbicular, smooth above ; fruit in drooping clusters, sub- 

 globose to short-oblong. 123. C. Gaultii (A). 



