Quercus macrocarpa, Bur Oak

White Oak Group: acorns mature in 1 year, small ones not present on winter twigs, leaves blunt-lobed, rounded at apex, winter buds generally rounded at apex

Size: tree, 60-80' average height and spread at maturity

Buds: clustered at twig tips, about .25" long, persistent threadlike stipules

Leaves: deciduous, alternate, 4-10" long, 2-5" wide, simple, obovate, lower portion of leaf has 2-3 pairs of lobes, upper part has a number of less-distinct, rounded, rather irregular and shallower lobes, dark green on top, grayish or whitish and tomentose underside, fall color yellow to brown

Twigs: light gray or brown, stout, small stain below leaf scar, may develop corky ridges after first year, 5-point star-shaped pith

Flowers: monoecious, male flowers in catkins, females in leaf axils, solitary or in small clusters

Fruit: acorn, nearly sessile, .75-1.5" long, cap encloses half or more, edges of cap conspicuously fringed

Bark: rough with deep ridges and furrows, dark gray or gray brown, not exfoliating on 4-5 year-old wood