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Article from Bean's Trees and Shrubs Hardy in the British Isles
'Quercus sadleriana' from the website Trees and Shrubs Online (treesandshrubsonline.
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A semi-evergreen thicket-forming shrub usually under 6 ft high; young stems more or less glabrous. Leaves ovate, elliptic, or slightly obovate, bluntish at the apex, rounded to cuneate at the base, mostly 21⁄2 to 4 in. long, 13⁄4 to 2 in. wide, the mature leaves almost glabrous, glossy rich green above, paler beneath, the lateral veins in twelve to fourteen pairs, very prominent beneath, parallel, running out to short, acute teeth, petioles 1⁄4 to 1 in. long, glabrous; stipules silky, 1⁄2 to 1 in. long. Fruits sessile, ripening the first year, usually borne singly; acorn ovoid, 1 in. or slightly more long, the cup enclosing about one-third of it; scales of cup acute, appressed, downy.
Native of the mountains of S.W. Oregon and N. California up to 9,000 ft; discovered by Jeffrey in 1851 or 1852 when collecting for the Oregon Association, and described in 1871. In Dr Schwarz’s classification of the genus Quercus, this species is more closely allied to Old World species such as Q. pontica and Q. glandulifera than it is to any other American oak, which makes it of considerable botanical interest.