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259 



(Callahan County) and to western Oklahoma (Dewey and Kiowa Counties), Arkansas, 

 eastern Kansas, southeastern Nebraska and through Missouri to northeastern Illinois, south- 

 western and southern Indiana, and northeastern Kentucky (South Portsmouth, Greenup 

 County, R. E. Horsey); rare in the north, very abundant southward; west of the Missis- 

 sippi River often forming on sterile soils a great part of the forest growth; of its largest 

 size in southern Arkansas and eastern Texas. 



X Quercus Rudkinii Britt., with characters intermediate between those of Quercus 

 marilandica and Q. Phellos, and probably a hybrid of these species, has been found near 

 Tottenville, Staten Island, New York, at Keyport, Monmouth County, New Jersey, and 

 at the Falls of the Yadkin River, Stanley County, North Carolina. 



X Quercus sterilis Trel., believed to be a hybrid of Quercus marilandica and Q. nigra 

 has been found in Bladen County, North Carolina. 



X Quercus Hastingsii Sarg., believed to be a hybrid of Quercus marilandica and Q. 

 texana, occurs near Boerne, Kendall County, and at Brownwood, Brown County, Texas. 



X Quercus Bushii Sarg., believed to be a hybrid of Quercus marilandica and Q. velutina, 

 although not common, occurs in eastern Oklahoma (Sapulpa, Creek County), Mississippi 

 (Oxford, Lafayette County), Alabama (Dothan, Houston County, near Berlin, Dallas 

 County, and Daphne, Baldwin County), Florida (Sumner, Levey County), and in Georgia 

 (Climax, Decatur County). 



14. Quercus arkansana Sarg. 



Leaves broadly obovate, slightly 3-lobed or dentate at the wide apex, cuneate at base, 

 on sterile branches often oblong-ovate, acute or rounded at apex, rounded at base, the 

 lobes ending in long slender mucros, when they unfold tinged with red, thickly covered 

 with pale fascicled hairs persistent until summer, the midrib and veins more thickly 



Fig. 237 



clothed with long straight hairs, and at maturity glabrous, with the exception of small 

 axillary tufts of pubescence on the lower surface, light yellow-green above, paler below, 

 2'-2f long and broad, with a slender light yellow midrib, thin primary veins and promi- 

 nent veinlets; on sterile branches often 4|'-5|' long and 2|'-2f wide; petioles slender, 

 coated at first with clusters of pale hairs, becoming glabrous or puberulous, f -*' in length. 

 Flowers: s laminate in aments covered with clusters of long pale hairs, 2'-2|' long; calyx 



