FAGACE^E 



285 



36. Quercus Vaseyana Buckl. Shin Oak. 

 Quercus undulata var. Vaseyana Rydb. 



Leaves oblong, rarely oblong-obovate, acute or rounded at apex, cuneate at base, undu- 

 Jately lobed with small acute lobes pointing forward, rarely nearly entire, when they unfold 

 covered above with short fascicled hairs sometimes persistent until midsummer, and 

 tomentose below, and at maturity thin, pale gray-green, glabrous and lustrous above, pale 

 pubescent below, I'-l-J' long and |'-f wide; deciduous late in winter or in early spring; 

 petioles covered with fascicled hairs when they first appear, becoming glabrous, 5' in 

 length. Flowers: staminate in villose aments l'-l|' long; calyx deeply divided into 4 or 

 ,5 ovate scarious lobes rounded at apex and shorter than the stamens; pistillate on short to- 



Fig. 261 



mentose peduncles, then- involucral scales ovate, acute, pubescent, shorter than the calyx- 

 lobes; stigmas red. Fruit solitary or in pairs, sessile or short-stalked; nut ellipsoidal and 

 only slightly narrowed at the rounded ends to oblong and slightly ovoid or obovoid, i'-J' 

 in length, Y~ in diameter, pale chestnut-brown and lustrous, the base only inclosed in 

 the thin, saucer-shaped to cup-shaped cup, puberulous on the inner surface, covered with 

 closely appressed ovate acute hoary tomentose scales, on some individuals abruptly con- 

 tracted into short acute red-brown nearly glabrous tips. 



A tree, rarely 15-20 high, usually a shrub only l-3 tall, spreading into great thickets, 

 with slender branchlets thickly covered with matted fascicled hairs during their first sea- 

 son, and light gray and glabrous or puberulous in their second year. Winter-buds ovoid or 

 obovoid, about f long, with red-brown scales ciliate on the margins. Bark rough, deeply 

 furrowed and scaly. 



Distribution. Limestone slopes and ridges or in sheltered canons; western Texas; 

 Kimble, Real, Kendall, Kerr, Uvalda, Edwards, Menard and Valverde Counties. 



37. Quercus Mohriana Rydb. Shin Oak. 



Leaves oblong-obovate to elliptic or lanceolate, acute, acuminate or rounded at apex, 

 rounded or cuneate and often unsymmetrical at base, entire, undulate, sinuately toothed 

 with triangular apiculate teeth, or occasionally irregularly lobed above the middle with 

 rounded lobes, thick, gray-green, lustrous and covered above with short fascicled hairs, 



