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Key to families | Table of families and genera
Index to accepted names and synonyms:
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|Family: Fagaceae||View Description||Dichotomous Key|
|Genus: Quercus||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Quercus robur L.
Habit: Tree < 30 m, deciduous; trunk bark scaly, light gray. Leaf: (5)7--15(20) cm; petiole 3--6 mm; blade obovate to narrow-elliptic or -obovate, adaxially shiny or dull, deep to light green or gray, abaxially glabrous (in youth sometimes sparsely hairy), light green, base strongly cordate, often revolute, tip widely rounded, margin lobes 6--12 per leaf, deep (sinuses 1/3--7/8 distance lobe tip to midrib), rounded, generally coarsely 2-toothed at tip. Fruit: cup 13--20 mm wide, 8--10 mm deep, hemispheric to deeply goblet-shaped, scales +- not tubercled; nut 15--30(35) mm, 12--20 mm wide, ellipsoid or oblong, distally obtuse to rounded, shell woolly inside; mature in year 1.
Ecology: Roadsides, pastures, forest margins, woodlands, persisting near old homesites; Elevation: < 1000 m. Bioregional Distribution: s SnFrB (Santa Cruz Mountains); Distribution Outside California: Washington, British Columbia to Prince Edward Island; native to Europe. Flowering Time: Mar--Apr Note: Cordate leaf base distinctive, evidently dominant, present in hybrids. Very important in furniture, previously in sailing ships. Hybridizes with Quercus lobata; hybridized artificially with Quercus turbinella; hybrids with Quercus ilex (Quercus ×turneri Willd.) in cultivation but evidently not in nature despite occurring together.
Synonyms: Quercus pedunculata Ehrh.
Unabridged Note: Hybrids reported with a number of taxa that have not been reported from California: Quercus alba L. (Quercus ×bimundorum E.J. Palmer); Quercus bicolor Willd. (Quercus ×warei T.L. Green & W.J. Hess); Quercus cerris L.; Quercus faginea Lam.; Quercus frainetto Ten.; Quercus humilis DC.; Quercus macrocarpa Michx. (Quercus ×macdanielii T.L. Green & W.J. Hess); Quercus mongolica Fisch. ex Ledeb.; Quercus petraea (Matt.) Liebl. (Quercus ×rosacea Bechst.); Quercus pyrenaica Willd. (Quercus ×andevagensis Hy 1895, Quercus ×henriquesii Franco & Vasc. 1954).
eFlora Treatment Author: Thomas J. Rosatti & John M. Tucker
Jepson Online Interchange
Previous taxon: Quercus parvula var. tamalpaisensis
Next taxon: Quercus sadleriana
Citation for this treatment: Thomas J. Rosatti & John M. Tucker 2017. Quercus robur, in Jepson Flora Project (eds.) Jepson eFlora, Revision 2, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=40723, accessed on March 29, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on March 29, 2017.