Oaks of the World

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  Quercus benthamii
Author A.DC 1864 Prodr. 16(2): 29 1864
Synonyms baruensis C.H Muller 1958
gemmata Trel. 1924 Diagnosis here
lowilliamsii C.H.Mull. 1950
rapurahuensis Pittier ex Seemen 1904    (A. Camus : 352)  Diagnosis here
undulata Benth. 1841
Local names  
Range Costa-Rica (2400 m), El Salvador (2500 m), Guatemala (2100 m), Honduras (1800-2800 m), Mexico (Chiapas, Oaxaca, 1500-3000 m), Nicaragua (450-1700 m), Panama (2100 m);
Growth habit 15-35 m tall;
Leaves

5-13 x 2-4 cm; deciduous; leathery; mostly oboval or elliptic; apex acute to acuminate or attenuate, seldom aristate; base remotely cuneate or narrowly acute, sometimes obtuse; margin entire, flat or weakly revolute, often wavy, seldom with few bristle-tips; dark green, glabrous or glabrescent above, with trichomes on the midrib; stellate hairs at axils and along midrib beneath, without glandular hairs; 10-14 pairs of lateral veins, straight or nearly so, strongly prominent below; epidermis smooth or slightly bulled; hairy petiole 6-20 mm long;

Flowers male inflorescences 5-15 cm, with numerous flowers; female very short, bearing 1-4 pubescent flowers;
Fruits acorn 1.5-2 cm x 1.6-2; singly or paired; subglobose, apically rounded, mucronate, on a 3-6 mm long stalk; nut enclosed 1/3 in cup; inner surface of shell pubescent; cupule hemispheric or turbinate, not rolled at margin, 2-3 cm in diameter, with broadly triangular, pointed, appressed, yellowish coffee-coloured, pubescent scales; ripen the first year;

Bark, twigs and
buds

bark rough, grey to black; twigs 1.5-3 mm thick, coffee-coloured, rusty pubescent first year, becoming glabrous, with prominent light-coloured lenticels; buds ovate 3-5 mm, with silky scales;
Hardiness zone, habitat a little tender;
Miscellaneous -- A. Camus : n° 322;
-- Sub-genus Quercus, section Lobatae; Series Benthamiae;
-- For many Authors, Q. rapurahuensis is a true species, having more secondary vein pairs (more than 20);

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

-- The plants from Nicaragua have generally toothed leaves (but they may have been misidentified);
-- close to
Q.humboldtii Bonpl.
-- hybridizes with
Q.salicifolia;
Subspecies and
varieties
 
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