Quercus macrocarpa bur oak; mossycup oak Fagaceae QUMA(*); Bx, br, pb; NY, ct;


Quercus macrocarpa.USDA.en.wikipedia.org. (Accessed 9/2014).

Quercus macrocarpa.USDA.en.wikipedia.org. (Accessed 9/2014).

Quercus macrocarpa is a tree to 24 m; bark light gray, rough, (white oak group, subgenus Lepidobalanus) deeply furrowed. 

Leaves alternate, deeply lobed to 25 cm long, widest above middle, lobes 4-7 per side, blunt, often with secondary blunt lobes. 

Flowers monoecious. Males catkins. 

Fruit acorn to 4 cm thick, cups bowl shaped, often covering most of nut, scales fringe-like (similar to Q. cerris), hairy, nut fairly short, wide. 

Wetland status: FACU. 

Frequency in NYC: Very infrequent. 

Origin: Mostly originating in Midwest, west and sometimes northeast of NYC region (Maine). 

Habitat: Almost always planted. Trees in Bronx Park may have produced a few seedlings. Soil pH 4.5-7.5, moderately tolerant of shade (USDA, NRCS 2010).