WOOTON AND STANDLEY — FLORA OF XLW MEXICO. 411 



KEY TO THE SPECIES. 



Corymbs long-ped uncled; teeth of the leaves acute. 



Leaves, at least most of them, 3-parted 1 . A. neomexicanum. 



Leaves merely 3 or 5-lobed, never parted 2. A. glabrum. 



Corymbs nearly sessile; teeth of the leaves obtuse. 



Lobes of the leaves broadly oblong, with several teeth, 

 broadest near the apex; wing of the fruit 30 mm. long 



or more 3. A. grandidentatum. 



Lobes of the leaves triangular-lanceolate, mostly entire, 



broadest at the base; wings 15 mm. long 4. A. brachypterum. 



1. Acer neornexicanum Greene, Pittonia 5: 3. 1902. 

 Type locality: Mountains near Las Vegas, New Mexico. 

 Range: New Mexico and Arizona to southern Colorado. 



New Mexico: Santa Fe and Las Vegas Mountains; Sandia Mountains; Copper Can- 

 yon; Mogollon Mountains; Lookout Mines; Cloudcroft; White Mountains. Damp 

 woods and along streams, in the Transition and Canadian zones. 



This may be the same as A. tripartitum Nutt,, but it seems different. Acer mum, \ i- 

 cii mi in and the following are slender shrubs, usually from 2 to 4 meters high. 



2. Acer glabrum Torr. Ann. Lye. N. Y. 2: 172. 1828. 

 Type locality: "On the Rocky Mountains." 



Range: Wyoming and Nebraska to Utah and New Mexico. 



New Mexico: Zuni Mountains; Tunitcha Mountains; Dulce; Sierra Grande. Damp 

 woods, in the Transition and Canadian zones. 

 The specimens show noue of the divided leaves of A. neomexicanum. 



3. Acer grandidentatum Nutt.; Torr. & Gray, Fl. N. Amer. 1: 247. 1838. 

 Type locality: "Rocky Mountains, on Bear River of Timpanagos." 

 Range: Montana to Arizona and western Texas. 



New Mexico: Holts Ranch; Lookout Mines; Organ Mountains; White and Sacra- 

 mento mountains. Woods, in the Transition Zone. 

 A medium-sized tree with spreading branches. 



4. Acer brachypterum Woot. & Standi. Contr. U. S. Nat. Herb. 16: 1 16. 1913. 

 Type locality: San Luis Mountains, New Mexico. Type collected bj E. A. 



Mearns (no. 535). 



Range: Southwestern New Mexico, southeastern Arizona, and adjacent Mexico. 



New Mexico: San Luis Mountains. 



A specie aear .1. grandidentatum, bu1 the Leaves more denselj pube cei i and with 

 very differenl lobes and the wing of the fruil much shorter. 



NEGXJNDO Boehmer. Bos elder. 



Medium-sized tree with pinnate leaves; young twigs Bmooth and glaucous, green; 



It .it!, i :;, sometimes 5, mate, with a fe^ coan <■ teeth aear the apex, or i omet 



snini'u hat lobed. 



1. Negundo interius (Britton) Rydb. Bull. Torrey Club 40: 56. L91S. 

 interior Britton in Britt. A: Shaf. N. Amer. Trees 6 L90S 



Rulac interior Nieuwland, Amer. Mid. Nat. ~: L39. L911. 

 Type lo< Uirnr: < Ihaparral-coA ered hill- southeast of < hiray, < iolorado. 

 Rj [i iii«i Arizona to Saskatchewan and Manitoba, 



Mexico Pecos; Eurrah Creel I Chloride; Black Ran e; Cliff; Gila; 



Anima Peak; Organ Mountains; Trinchi ra Pa runitcha Mountains; White Moun- 

 tain \ loni tn .ii.i , in the Transition Zone. 



