|Quercus x crenata|
|Author||Lam. 1785 Lamarck & al., Encycl. 1(2): 723. 1785.|
= cerris var. lucombeana Loud. 1838
= x lucombeana Holway 1772
= cerris var. fulhamensis 1838
= x fulhamensis Steud. 1841
= x pseudocerris Lojac. 1907, not Boiss. 1853, nec Rouy 1910
= x turneri A.DC not Willd.
|Local names||Chêne de Lucombe;|
|Growth habit||15 m; reaches sometimes to 30 m, with a trunk 2 m in diameter;|
|Leaves||4-7 cm X 3-4, sub-evergreen; oblong; apex pointed; base cuneate or truncate; margin with 5-9 irregular lobes each side, with sinuses deeper near the middle of the blade; adaxially shiny green when the silvery grey hairs have fallen; abaxially grey-gree pubescent; petiole 1 cm long, pubescent;|
|Fruits||acorn 2.5 cm long, brown, with apex slightly depressed; peduncle 1 cm long, thick, tomentose; cup enclosing 1/2 of fruit; cupscales slender, sinuous, 0.2-0.5 cm long, not appressed; maturing in 2 years;|
Bark, twigs and
|bark variable : light grey, fissured or smooth, or in more or less corky plates; young twigs grey-brown, at first densely pubescent then glabrous; terminal buds with less scales than the lateral ones;|
|Hardiness zone, habitat||hardy; all types of soils;|
-- polymorphous species, depending on whether Q. cerris or Q. suber is dominating; which has led to the description of a lot of species, subspecies, varieties and formas;
-- Q. x turneri A.DC (not Willd.) is a synonym of Q. x crenata, whereas the taxon named Q. x turneri Willd. is actually a cultivar (= Q. 'Turneri'), artificial hybrid between Q. ilex and Q. robur (see the description here); but for Govaerts and Frodin 1998, Q. x turneri A.DC has for synonym Q. x pseudoturneri C.K.Schneider while this name is generally considered as a synonym of Q. 'Turneri' !
-- Q. pseudocerris Boiss. 1853 is a synonym of Q. cerris, and Q. pseudocerris Rouy 1910 in a non-resolved name.
-- -- Q.
crenata is strongly threatened with extinction : only ca. 1000
plants remains in Italy, where it is protected, and a few in France.
Recent (2018) genetic studies indicate that this taxon may represent
the remainder of the ancestral form from which Q. suber evolved,
rather than a hybrid between Q. suber and Q. cerris.