326 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



In the Organ Mountains this species occurs in abundance in the opening of the can- 

 yon in which Van Pattens Camp is located, growing along with Quercus grisca and 

 Q. arizonica. Attempts have been made to use the trees as stocks for grafting various 

 fruits, but they have been unsuccessful. 



The material from the western part of the State may represent a different species. 

 Tliis plant is usually much smaller, only a tall shrub, and its leaves are narrower, 

 thicker, not so bright a green, and on shorter petioles. 



3. Padus melanocarpa (A. Nels.) Shafer in Britt. & Shaf. N. Amer. Trees 504. 1908. 

 Cerasus demissa melanocarpa A. Nels. Bot. Gaz. 34: 25. 1902. 



Prunus melanocarpa Rydb. Bull. Torrey Club 33: 143. 1906. 



Typk locality: Rocky Mountains. 



Range: British Columbia and Alberta to California and New Mexico. 



New Mexico: Zuni Mountains; Chama; Santa Fe and Las Vegas mountains; Raton 

 Moim tains; Magdalena Mountains; Sierra Grande; Sandia Mountains; White and 

 Sacramento mountains. Damp woods, especially along streams, chiefly in the Tran- 

 sition Zone. 



The species, if all our material represents a single one, shows considerable varia- 

 tion, possibly because of altitude. At the lower levels in the northern part of the 

 State it is a ehrub 2 or 3 meters high with very large fruit. Higher up, at Winsors 

 Ranch, it is a very low shrub, usually with only a single stem in a place, not more 

 than 50 to 60 cm. high. Mature fruit could not be secured at the higher levels, so 

 that it is impossible to tell whether there is any substantial difference between the 

 two plants in that feature. 



4. Padus pumicea Woot. & Standi. Contr. U. S. Nat. Herb. 16: 133. 1913. 



Type locality: Craters, Valencia County, New Mexico. Type collected by Woo- 

 ton, July 28, 1906. 



Range: Mountains of western New Mexico. 



New Mexico: Craters; mountains south of Canjilon. 



From all our pubescent species this differs in having the leaves of about the same 

 color on both surfaces. The fruits, too, are very few and the pedicels remarkably 

 short. The branches are densely furnished with leaves, so that in general appearance 

 this is unlike any of our other choke cherries. 



5. Padus mescaleria Woot. & Standi. Contr. U. S. Nat. Herb. 16: 134. 1913. 

 Type locality : On Tularosa Creek near the Mescal ero Agency, New Mexico. Type 



collected by Wooton, August 6, 1901. 



Range: Wliite Mountains of New Mexico, in the Transition Zone. 



The most distinctive features of this are the long pedicels, glabrous racemes, large 

 seeds, and rather narrow deep green leaves, strongly glaucous beneath. 



6. Padus calophyUa Woot. & Standi. Contr. U. S. Nat. Herb. 16: 134. 1913. 

 Type locality: Five miles west of Chloride, New Mexico. Type collected by 



E. A. Goldman (no. 1768). 



Range: Mountains of northwestern New Mexico. 



New Mexico: West of Chloride; Tunitcha Mountains; Santa Fe Canyon. Transi- 

 tion Zone. 



7. Padus vaHda Woot. & Standi. Contr. U. S. Nat. Herb. 16: 134. 1913. 



Type locality: Canyons near Kingston, Sierra County, New Mexico. Type col- 

 lected by Metcalfe (no. 1243). 



Range: Mountains of western New Mexico. 



New Mexico: Kingston; Magdalena Mountains. Transition Zone. 



