502 Rydberg: Notes on Rosaceae 



Cercocarpus breviflorus A. Gray. This has nearly the same 

 range as the preceding, but is more eastern, being found also in 

 western Texas and Coahuila. It is, however, lacking in Sonera 

 and western Arizona. 



Cercocarpus ledifolius Nutt. is the most widely distributed 

 species of the genus. Its characters are rather constant. It 

 varies, however, in the width of the leaves and in the margin 

 being more or less revolute. Cercocarpus ledifolius intercedens 

 sub glabra C. K. Schneider is either an extremely narrow-leaved 

 form or else a hybrid with C. intricatus . 



Cercocarpus hypoleuctis Rydb. This has been mistaken for 

 both C. ledifolius and C. intricatus, but the villous pubescence of 

 the lower surface of the leaves should exclude it from either, 

 though it may cause some confusion with C. arizonicus. It has 

 smaller, narrower leaves with sharper petioles than C. ledifolius, 

 but larger leaves, less enrolled, and larger fruit than C. intricatus 

 and C. arizonicus. The following specimens are referred here: 



Montana: Melrose, 1895, Rydberg 2695; Shear 3216; Red 

 Rock, Shear 33 4q; Helena, 1908, Butler 713, 774; Tobacco Moun- 

 tain, Butler 4236; Montana, Kelsey; Lombard, 1900, Blankinship. 



Wyoming: Wolf Creek Canyon, A. Nelson 22Q2; between 

 Sheridan and Buffalo, 1900, Tweedy 3236; Big Horn, 1899, Tweedy 

 2540; Powder River, 1901, Goodding 252; 1893, Evermann; .Big 

 Horn Basin, 1893, V. Bailey; Tongue River, 1898, Tweedy 3 9. 



Idaho : Salmon River, Henderson 3143 and 3790; V. Bailey 49. 



Utah: Raft River, S. Watson 313 in part. 



Oregon: Snake River, 1897, Sheldon 8201. 



Cercocarpus intricatus S. Wats. M. E. Jones reduced this to 

 a variety of C. ledifolius, claiming that they grade into each other; 

 and still he proposed a new species C. arizonicus, which is much 

 closer to C. intricatus than C. ledifolius is. I have seen the speci- 

 mens from Willow Spring, Arizona, on which C. arizonicus was 

 based and these are identical with Jones's own specimens from 

 Deep Creek, determined by Jones as C. ledifolius intricatus. It 

 is evident that Jones did not distinguish these species very well. 

 Some of Jones's specimens are evidently hybrids. See below. 

 The range of C. intricatus includes parts of Utah, Arizona and 

 Nevada. A specimen from California, but with much shorter 



