WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 411 
KEY TO THE SPECIES, 
Corymbs long-peduncled; teeth of the leaves acute. 
Leaves, at least most of them, 3-parted...........2.....--- 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 
OF MOTe...-.-.----2 ee eee ee ee eee eee eee eee eee 3. A. grandidentatum, 
Lobes of the leaves triangular-lanceolate, mostly entire, 
broadest at the base; wings 15 mm. long........... 4, A. brachypterum. 
1. Acer neomexicanum Greene, Pittonia 5: 3. 1902. 
Type Locauity: 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 neomext- 
canum and the following are slender shrubs, usually from 2 to 4 meters high. 
2. Acer glabrum Torr. Ann. Lyc. N. Y. 2: 172. 1828. 
Type Locauity: ‘‘On the Rocky Mountains.” 
Range: Wyoming and Nebraska to Utah and New Mexico. 
New Mexico: Zuni Mountains; Tunitcha Mountains; Dulce; SierraGrande. Damp 
woods, in the Transition and Canadian zones. 
The specimens show none of the divided leaves of A. neomexicanum. 
83. Acer grandidentatum Nutt.; Torr. & Gray, Fl. N. Amer. 1: 247. 1838. 
Type Locauity: ‘‘Rocky Mountains, on Bear River of Timpanagos.”’ 
Rance: 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. & Standl. Contr. U. 8. Nat. Herb. 16: 146. 1913. 
TypPE LOCALITY: San Luis Mountains, New Mexico. Type collected by E. A. 
Mearns (no. 535). 
RanGeE: 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. 
Acer interior Britton in Britt. & Shaf. N. Amer. Trees 655, /. 608. 1908. 
Rulac interior Nieuwland, Amer. Mid. Nat. 2: 139. 1911. 
TypPE LocaLity: Chaparral-covered hills southeast of Ouray, Colorado. 
Rana@e: New Mexico and Arizona to Saskatchewan and Manitoba. 
New Mexico: Pecos; Hurrah 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. 
