142 FAGACEAE (BEECH FAMILY) 



surface brownish, pale, densely and softly pubescent, almost velvety, strongly 

 veined: fruit subsessile; cup hemispheric, 12-15 mm. in diameter; scales 

 pubescent, ovate, with much thickened corky backs; acorn ovoid, barrel- 

 shaped, mostly obtuse, 15-20 mm. long, light brown. From Wyoming to 

 New Mexico and Arizona. 



3. Quercus Vreelandii Rydb. 1. c. 204. 1901. A small shrub, 1-1.5 m. 

 high : bark of young branches brown, puberulent ; that of the older branches 

 and trunks ashy gray: bud-scales brown, thiri, puberulent on the margins: 

 petioles 5-10 cm. long, puberulent; leaf -blades 5-7 cm. long, obovate, deeply 

 lobed about two thirds to the midrib, thick, firm; lobes rounded, the larger 

 often lobed or sinuate; upper surface slightly stellate, soon glabrate, bright 

 green but not glossy; lower surface slightly paler and somewhat brownish 

 and puberulent: fruit subsessile; cup very shallow, covering one fifth or one 

 sixth of the acorn; scales ovate and very corky on the back; acorn barrel- 

 shaped or slightly ovoid, obtuse, about 15 mm. long, light brown. Colorado 

 and New Mexico. 



4. Quercus leptophylla Rydb. 1. c. 205. A tree 10-15 m. high: bark of 

 young twigs brownish or purplish, slightly pubescent at first ; that of the older 

 branches gray; that of the trunk rough and furrowed: bud-scales very thin, 

 brown, glabrous: petioles about 1.5 cm. long, sparingly stellate; leaf -blades 

 broadly obovate, very thin, pinnately 5-9-lobed scarcely more than halfway 

 to the midrib; lobes rounded; upper surface at first sparingly stellate, soon 

 glabrate, bright green, but not very glossy; lower surface paler, almost per- 

 fectly glabrous, or pubescent on the veins: fruit subsessile; cup hemispheric, 

 about 15 mm. wide, covering about half the acorn; scales ovate-lanceolate, ob- 

 tuse, only slightly thickened on the back; acorns short, barrel-shaped, obtuse 

 or even depressed at the apex. Colorado and New Mexico. 



5. Quercus Gunnisonii (Torr.) Rydb. 1. c. 206. A low shrub 1-3 m. high: 

 bark of young branches light brown, puberulent, of the older branches and 

 the trunk gray, somewhat shreddy: bud-scales brown, pubescent: petioles 

 about 1 cm. long, puberulent; leaf -blades oblong, elliptic or narrowly obovate 

 in outline, lobed halfway to the midrib or more with rounded lobes, very 

 thick, green above, sparingly stellate or soon glabrate, shiny; lower surface 

 paler, puberulent, veined: fruit subsessile; cup 12-15 mm. in diameter, hemi- 

 spherical, covering about one third of the acorn ; scales ovate with a lanceolate 

 tip, at least the lower much thickened and corky on the back; acorns barrel- 

 shaped, obtuse or even depressed at the apex (Q. nitescens and Q. novo- 

 mexicana Rydb. 1. c. 207 and 208). Colorado and New Mexico to Utah and 

 Arizona. 



6. Quercus Gambellii Nutt. Journ. Acad. Phila. II. 1: 179. 1848. A shrub 

 3-5 m. high: bark of young twigs light brown and puberulent; that of the 

 older branches and trunk gray: bud-scales brown, puberulent: petioles about 

 1 cm. long, puberulent; leaf-blades broadly obovate in outline, lobed one half 

 or two thirds the distance to the midrib, thinner than in the preceding; upper 

 surface glabrate, green, not very glossy; lower surface only slightly paler, 

 puberulent or nearly glabrous; lobes rounded: fruit subsessile: cup hemi- 

 spheric or somewhat turbinate; acorn ovoid, acute, half inclosed in the cup, 

 about 15 mm. long, light brown (Q. Eastwoodae Rydb. 1. c.). Utah to Colo- 

 rado and New Mexico. 



6a. Quercus Gambellii Fendleri (Liebm.) A. Nels. The shrub smaller 

 and reduced in all its parts: lobes of the leaves mostly acute: the acorn varying 

 from obtuse to acute (Q. Fendleri Liebm., Rydb. 1. c.; Q. venustula Greene, 

 Rydb. 1. c.)- Colorado to New Mexico and Texas. 



7. Quercus undulata Torr. Ann. Lye. N. Y. 2: 248. 1828. A shrub 1-3 m. 

 high: bark of the trunk gray, rough and much cracked; that of the branches 

 light gray and with numerous lenticels; that of the young twigs sparingly 

 stellate-pubescent: petioles 2-6 mm. long; leaf -blades firm, pale bluish or 

 brownish-green and shining above, pale brownish beneath, stellate when 

 young, almost glabrous in age on both sides or even densely stellate-pubescent 

 beneath, only sinuately dentate, acute at both ends; teeth mucronate, scarcely 



