Oaks of the World

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  Quercus x undulata
Author Torr. 1828 (pro sp) Ann. Lyceum Nat. Hist. New York 2: 248
Synonyms gambelii x turbinella
= x fendleri Liebm. 1854 Diagnosis here
= gambelii var. fendleri (Liebm.)
A.Nelson 1909
= undulata A.DC 1864
= undulata Sarg. p.p.
= x pauciloba Rydb. 1901 (pro sp.)
= x venustula Greene 1890
= x subobtusifolia A.Camus 1935
= x rydbergiana Cockerell 1903
Local names "wavyleaf oak"
Range Utah, Arizona, New Mexico, Texas; Mexico (Chihuahua);
Growth habit 1 to 3 m; rarely reaches 8 m;
Leaves evergreen; 4-9cm long, 3-5 wide, lustrous and light glaucous above, light brown tomentose beneath; margin with 2-5 pairs of pointed and mucronate lobes;
Fruits acorn 1.5-1.8cm long, mucronate, light brown, enclosed for 1/3 of length in bowl-shaped, reddish brown cup; maturing in 1 year;

Bark, twigs and

scaly grey bark;
Hardiness zone, habitat hardy; all types of soils.
Miscellaneous -- A. Camus = n 261;
-- Sub-genus Quercus, Section Quercus; sub-section Undulatae;

-- The species Q.gambelii hybridizes frequently, creating a population of hybrids described under the name " Q. x undulata complex " by Little in 1979, in order to change the name Q.undulata Torr.1827 ; the previous term was the name of a species whose common name is "wavyleaf oak", or "Rocky Mountain shin oak" ;
J.M. Tucker, in 1971, had yet indentified the main parents of this hybrid species : Q. turbinella, Q  grisea, Q. havardii, Q.mohriana, Q arizonica and Q.muehlenbergii ; hybrids between Q  gambelii and an evergreen species are often semi-evergreen;

-- The name "undulata" inspired many Authors ! One can list the following :
Engelm 1878 (= Q.sinuata Walt.),
Kit.1863 (= Q.pubescens Willd.),
Benth. 1841 (= Q.benthamii A.DC),
Q.undulata K.Koch 1847 (= Q.lusitanica Lam.),
Torr 1827 (= Q.x undulata complex Little 1979),
Sarg., and A.DC (more or less = Q.x pauciloba ...),
Q.undulata S. Wats. (= Q.gambelii Nutt.);

Subspecies and