Rydberg: Notes on Rosaceae 501 



locality, Plummer; Winsor's Ranch, 1908, Standley 4104; Ratan 

 Mountains, 1903, Griffiths 5497; White Mountains, 1907, Wooton 

 & Standley 3606; Sacramento Mountains, 1899, Wooton; Las 

 Vegas, 1891, Dewey; Folsom, 1903, A. Howell 171. 



Colorado: North Cheyenne Canyon, 1894, E. A. Bessey. 



Cercocarpus paucidentatus (S. Wats.) Britton. This species 

 was based on Cercocarpus parvifolius paucidentatus S. Wats. In 

 order to determine the type of the species, we must find the type 

 of the variety. The latter was based on Shaffner 114, Parry cf 

 Palmer 224* from San Louis Potosi, and Wright 1056 from Texas 

 or eastern New Mexico. The first, Shaffner 114, must be regarded 

 as the type, but Parry & Palmer 225 is the same. Upon this very 

 number C. K. Schneider based his C. Treleasii, which therefore 

 becomes a synonym. Wright 1056 belongs to another species, 

 the same as Wilcox's specimen from which Britton mainly drew 

 his description of C. paucidentatus. This was without a specific 

 name, and I adopted Schneider's varietal name for it. The fol- 

 lowing specimens belong to C. paucidentatus (S. Wats.) Britton 

 or C. Treleasii C. K. Schneider. 



San Louis Potosi: Shaffner 114, 476, 635; Parry & Palmer 



225. 



Hidalgo: Ixmiguelpan, 1905, Purpus 1383. 



Cercocarpus eximius (C. K. Schneider) Rydb. This is C. 

 paucidentatus Britton, mainly as to the description, but not the 

 type. Sargent regarded it as the same as C. brevifolius A. Gray. 

 Schneider first admitted it as a variety eximius, but afterwards 

 adopted Sargent's views. He, however, did not have a clear 

 conception of the same, for Rusby 125 and other specimens with 

 better developed and more toothed leaves, he referred doubtfully 

 to C. betulaefolius . Leaves toothed above the middle are not 

 uncommon and sometimes found together with perfectly entire- 

 margined leaves on the same bush. It is to be admitted that it 

 is closely related to C. breviflorus, but differs in the spreading 

 pubescence and the longer hypanthium. It is also much more 

 common than C. brevifolius and its range extends through New 

 Mexico, Arizona, Chihuahua and Sonora. 



* This is evidently a misprint for 225, because Parry & Palmer 224 is a species 

 of Rubus and also cited by Watson under Rubas trivialis. It is now known as 

 R. oligospermia Thornber. 



