k 



WOOTON AND STANDLEY ^LORA OF NLW MEXICO, 411 



KEY TO THE SPECIES. 



Corymbs long-peduncled; teeth of the leaves acute. 



Leaves, at least most of them, 3-i)arted 1. A. neomexicanum. 



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



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 neomexicanuni 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; ^^^lite Mountains. Damp 

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



This may be the same as A. tripartUum Nutt., but it seems different. Acer neomexi- 

 canum 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." 



R-\nge: 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 none 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; ^\^lite 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: 146. 1913. 

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



Mearns (no. 535). 



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



New Mexico: San Luis Mountains. 



A species near A. grandidentatum, but the leaves more densely pubescent and with 

 very different lobes and the wings of the fruit much shorter. 



NEGUNDO Boehmer. Box elder. 



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

 leaflets 3, sometimes 5, ovate, with a few coarse teeth near the apex, or sometimes 

 somewhat lobed. 



1. Negundo interius (Britton) Rydb. Bull. Torrey Club 40: 56. 1913. 



Acei- Ulterior Britton in Britt. & Shaf. N. Amer. Trees 655./. 608. 1908. 



Rulac interior Nieuwland, Amer. Mid. Nat. 2: 139. 1911. 



Type locality: Chaparral-covered hills southeast of Ouray, Colorado. 



Range: New Mexico and Arizona to Saskatchewan and Manitoba. 



New Mexico: Pecos; Hun-ah Creek; west of Chloride; Black Range; Cliff; Gila; 

 Animas Peak; Organ Mountains; Trinchera Pass; Tunitcha Mountains; White Moun- 

 tains. Along streams, in the Transition Zone. 



