Trees , deciduous, to 15 m. Bark almost black, with irregular or rectangular blocks, inner bark orangish. Twigs ashy brown, (1-)2-4(-5) mm diam., pubescent to tomentose. Terminal buds conic or narrowly ovoid-ellipsoid, 5-10 mm, noticeably 5-angled in cross section, tawny pubescent. Leaves: petiole 5-20 mm, densely to sparsely pubescent. Leaf blade obovate to obtrullate, (50-)70-200 × (40-)70-200 mm, base rounded or cordate, blade not decurrent, margins with 3-5 shallow, often very broad lobes and 3-10 awns, apex acute to obtuse, rarely rounded; surfaces abaxially scurfy or with scattered pubescence, adaxially glossy, glabrous, secondary veins raised on both surfaces. Acorns biennial; cup turbinate, 6-10 mm high × 13-18 mm wide, covering 1/3 nut, outer surface puberulent, inner surface pubescent, scale tips loose, especially at margin of cup, acute or acuminate; nut broadly ovoid or ellipsoid, 12-20 × 10-18 mm, often striate, glabrate, scar diam. 5-8 mm. 2 n = 12. [R. C. Friesner 1930. J. W. Duffield (1940) suggested that Friesner was counting bivalents; if so, then 2 n = 24, consistent with all other reports for Quercus .] Small or medium-sized tree with deeply checked bark and thinly pubescent twigs; buds densely pubescent, 5–8 mm; lvs broadly obovate or triangular- obovate, mostly (6–)10–20(–30) cm and half to fully as wide, shallowly and broadly 3-lobed across the summit, rarely with additional lobes below, sometimes nearly or quite entire, rounded or subcordate at base, brownish-green beneath with minute, closely appressed hairs, rarely softly stellate-tomentose; petioles mostly 0.5–1.5 cm; acorns 1.5–2 cm, the cup turbinate, enclosing half the nut, its scales relatively few and large, sericeous. Dry or sterile, especially sandy soil; s. N.Y. to s. Io., s. to Fla. and Tex. The vegetatively persistent, often locally abundant hybrid with Q. ilicifolia is Q. ×brittonii W. T. Davis. Small or medium-sized tree with deeply checked bark and thinly pubescent twigs; buds densely pubescent, 5–8 mm; lvs broadly obovate or triangular- obovate, mostly (6–)10–20(–30) cm and half to fully as wide, shallowly and broadly 3-lobed across the summit, rarely with additional lobes below, sometimes nearly or quite entire, rounded or subcordate at base, brownish-green beneath with minute, closely appressed hairs, rarely softly stellate-tomentose; petioles mostly 0.5–1.5 cm; acorns 1.5–2 cm, the cup turbinate, enclosing half the nut, its scales relatively few and large, sericeous. Dry or sterile, especially sandy soil; s. N.Y. to s. Io., s. to Fla. and Tex. The vegetatively persistent, often locally abundant hybrid with Q. ilicifolia is Q. ×brittonii W. T. Davis. Trees , deciduous, to 15 m. Bark almost black, with irregular or rectangular blocks, inner bark orangish. Twigs ashy brown, (1-)2-4(-5) mm diam., pubescent to tomentose. Terminal buds conic or narrowly ovoid-ellipsoid, 5-10 mm, noticeably 5-angled in cross section, tawny pubescent. Leaves: petiole 5-20 mm, densely to sparsely pubescent. Leaf blade obovate to obtrullate, (50-)70-200 × (40-)70-200 mm, base rounded or cordate, blade not decurrent, margins with 3-5 shallow, often very broad lobes and 3-10 awns, apex acute to obtuse, rarely rounded; surfaces abaxially scurfy or with scattered pubescence, adaxially glossy, glabrous, secondary veins raised on both surfaces. Acorns biennial; cup turbinate, 6-10 mm high × 13-18 mm wide, covering 1/3 nut, outer surface puberulent, inner surface pubescent, scale tips loose, especially at margin of cup, acute or acuminate; nut broadly ovoid or ellipsoid, 12-20 × 10-18 mm, often striate, glabrate, scar diam. 5-8 mm. 2 n = 12. [R. C. Friesner 1930. J. W. Duffield (1940) suggested that Friesner was counting bivalents; if so, then 2 n = 24, consistent with all other reports for Quercus .]General Information
Source: [
Source: [
Manual of Vascular Plants of Northeastern US and Canada
General InformationFlora of North America @ efloras.org
General Information
| Name | Language | Country | |
|---|---|---|---|
| Blackjack oak |
|
