| Quercus macrocarpa | |
| Author | Michx. 1801 Hist. Chênes Amér. 2 |
| Synonyms | macrocarpa var. oliviformis (F.Michx.) A.Gray
1856 macrocarpa subsp oliviformis (F.Michx.) A.Camus 1935 macrophylla hort. not Née oliviformis F.Michx. 1811 ramosa Booth |
| Local names | mossycup
oak ; burr oak ; Northern overcup oak ; |
| Range | Eastern
USA; to 1000 m and more; introduced in Europe in 1795; |
| Growth habit | 20
m tall (may reach 30 m); crown spreading; stout trunk 0.6-1.2 m in diameter;
|
| Leaves | 10-15
(30) x 5-13 cm; oblong; narrower near midblade; apex rounded; base cuneate;
5-9 deep lobes; lustrous green above; greyish tomentose beneath; 4-5 vein
pairs; petiole 1.5-2.5 cm long; |
| Flowers | pistillate
and staminate flowers in early spring; |
| Fruits | acorn
2.5-5 cm long; oval; pubescent at apex; stout peduncle 1-2 cm long; cup
hairy, deep (enclosing 1/2 or more of nut), purplish, 2 cm in diameter;
cotyledons distinct; maturing in 1 year; |
|
Bark, twigs and |
bark
yellowish grey, shiny, becoming furrowed, rough, dark brown; twig pubescent,
sometimes with corky ridges; buds 2-5 mm long, glabrous; |
| Hardiness zone, habitat | hardy;
all types of soils, including calcareous ones; reaches 150 years old;
|
| Miscellaneous | --
A. Camus : n° 279 ; -- Sub-genus Quercus, Section Quercus, Subsection Prinoideae; -- Related to Q.bicolor ; -- Hybridizes with : Q. alba (= x bebbiana), michauxii (= x byarsii), muehlenbergii ( = x deamii), stellata (= x guadalupensis), lyrata (= x megaleia), bicolor (= x schuettei) ; |
| Subspecies and varieties |
--
var. depressa (Nuttall) Engelm. 1876 Trans. Acad. Sci. St.
Louis 3: 382 = Q. obtusiloba var depressa Nutt. 1818 = Q. stellata var. depressa (Nuttal) A.DC 1864 = Q. macrocarpa f. depressa (Nutt.) Trel. 1924 = Q.mandanensis Rydb. 1931 Minnesota, North Dakota; Colorado; probably just a geographic race... |
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