204 REHDER. 



256); Bowie, September 16, 1884, M. E. Jones (No. 4235). Pima 

 Co.: near Tucson, April 1908, J. N. Rose (No. 12131), March and 

 October, 1895, ./. W. Tourney (U. S. Nat. Herb. No. 619020). Y a v a- 

 pai Co.: Sierra Prieta, near Prescott, alt. 1850 m., Sept. 4, 1916, 

 A. Rehder (No. 512''). 



This Ash is widely distributed through New Mexico and Arizona 

 except in the northeastern part of the former of these states, and is 

 rather common along water courses at elevations of between 1000 to 

 2400 m. It is extremely variable and the most extreme forms have 

 the appearance of distinct species, but they are all closely connected 

 by intermediate forms so that it seems impossible to divide this group 

 of forms satisfactorily into se^'eral species, but by selecting the most 

 distinct forms as types the forms may be grouped under the following 

 varieties. 



To typical F. velutina I refer the specimens enumerated abo\e; 

 they resemble the type specimen in having few, usually 3-5, generally 

 elliptic, short-stalked or nearly sessile leaflets and densely pubescent 

 branchlets and leaves. In the type specimen most of the leaves are 

 3-foliolate; the leaflets of the 3-foliolate leaves are elliptic, acute at 

 the ends, distinctly serrate, the larger terminal leaflets measure 5-5.5 

 cm. by 3-3.5 cm., while the lateral leaflets are similar, but smaller; 

 the lateral leaflets of the 5-foliolate leaves are narrower and measure 

 about 4 cm. by 1.5 cm. The fruits are about 2.3 cm. long, with a 

 slender terete body slightly longer than the linear-oblong w ing which 

 is 3-4 mm. broad. Typical F. velutina is the most common form of 

 this group in southern and western New Mexico and is also found in 

 eastern and central Arizona. 



Fraxinus velutina var. Toumeyi, n. var. 



Fraxinus velutina Sargent, Siha N. Am. W. t. 267 (pro parte 



(1894), tantum quoad plantam depictam. 

 Fraxinus attenuata Jones, Contrib. West. Bot. XII. 59 (pro parte) 



(1908, March 26), quoad specimen ex Arizona. — Wooton & 



Standley in Contrib. U. S. Nat. Herb. XIX. 496 (Fl. N. Mex.) 



(1915). 

 Fraxinus Toumeyi Britton, Trees N. .im. 803, fig. 732 (1908). 



New Mexico. Guadalupe Co.: Guadalupe Canyon, July 

 28, 1892, E. A. Mearns {No. 582). Dona Ana Col: Organ 

 Mts., 1881, G. R. Vasey (U. S. Nat. Herb. No. 49369); Filmore Can- 

 yon, August 4, 1895, and April 15, 1899, E. 0. Wooton (U. S. Nat. 

 Herb. Nos. 735196, 738263). Sierra Co.: Lake Valley, 1916, 



