THE GENUS FRAXINUS. 209 



alt. 1900 m., September 8, 1908, E. A. Goldman (No. 1482). Grant 

 Co.: San Luis Mts., June 25 and October 2, 1892, E. A. Mearna 

 (No. 382); Santa Rita, "Copper Mines, N. E. of El Paso", 1851, 

 J.M. Bigclow. Without precise locality, 1851, C. JVmjht (No. 1697). 

 Arizona. Graham Co.: White Mts., August 6-15, 1903, D. 

 Griffith (No. 5390). Cochise Co.: Huachuca Mts., Ash Can- 

 yon August 6, 1909, L. N. Godding (No. 342); April, 1897, ./. W. 

 Tourney. Pima Co.: Santa Rita Mts., September 20 -October 4, 



1902, D. Griffith & J. J. Thornber (No. 176). Coconino Co.: 

 Oak Creek Canyon, alt. 2000 m. and 1800 m., September 15, 1916, 

 A. Rehder (Nos. 581, 586); shaded ravine near head of Oak Creek, 

 June 21, 1916, F. Shreve (No. 24); San Francisco Mts., Elden Mt., 

 July 17, 1891, D. T. McDougal (No. 396). 



Mexico. So nor a: San Jose Mts., alt. 2400 m., August 7, 



1903, E. A. Mearns (Nos. 1668, 1671). 



This species seems most closely related to F. velutina Torrey, but 

 differs chiefly in the usually 7-9-foliolate leaves and in the fruit which 

 has a thick, terete, ellipsoid or oblong body, similar to that of F. 

 americana Linnaeus and a wing longer than the body; the body is 

 about 2 to 4 times longer than thick and finely striate, while in typical 

 F. velutina the fruit has a thin slender body gradually narrowed 

 toward the base, 5-7 times longer than broad and more or less irregu- 

 larly grooved. The fruit of the latter resembles that of F. pemisyl- 

 vanica Marshall except that it is smaller and has a relatively much 

 shorter wing. From F. americana which it resembles in the fruit F. 

 Standleyi is distinguished by the sessile smaller leaflets with the epi- 

 dermis of the under side not papillose and by the smaller fruit. 



This new species seems to be as variable as F. velutina and of the 

 specimens quoted above no two are exactly alike. Wright's No. 

 1697 differs in the quite glabrous leaflets more glaucescent beneath 

 and in the narrower, deeply emarginate wing of the fruit. Gold- 

 man's No. 1482 has also quite glabrous leaflets, but much smaller 

 and never as many as nine. Griffith's & Thornber 's No. 176 has 

 narrower, more glaucescent leaflets and fruits with narrower pointed 

 wings. Mearn's No. 382 has smaller leaflets sparingly short-pubes- 

 cent on the whole under surface, a puberulous rhachis and fruits with 

 narrower wings. McDougal's No. 396 has leaves with always 7, 

 elliptic, distinctly petioluled leaflets and fruits with narrower wings. 

 Godding's No. 343 has also elliptic leaflets always 7 in number and 

 narrower fruits only 1.5-2 cm. long. Shreve's No. 24 and my own 

 No. 581 have 7, rather large, short-stalked, elliptic or oval obtusish 



