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Compare sources for Quercus ellipsoidalis

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Field
Oaks of the World
The Sibley Guide to Trees
Common Names
jack oak, northern pin oak, Hill’s oak
Jack Oak, Northern Pin Oak, Hill;s Oak
Geographic Range

Canada (Ontario); USA (Illinois, Indiana, Iowa, Michigan, Minnesota, Ohio, Wisconsin); 150-500 m; introduced in Europe in 1902;

Growth Habit

reaches 18 m; short trunk, narrow crown; the lowest part of the trunk bears often dead branches;

Deciduous. Medium to large tree often 65’.

Leaves

7.5-13 x 6-10 cm; elliptic to oboval; 3 deep lobes each side, lobes lobulate; lobes and lobules bristle-tipped; median lobes longer than other lobes; shiny green above, paler beneath; glabrous both sides except axillary tufts of hairs underneath; 3-4 pairs of lateral veins ; red at fall; petiole glabrous, 2-5 cm;

-5 1/2”

  • deeply lobed
  • pale green underleaf
Fruits (Acorns)

acorn 1.2-2 cm; brown, ellipsoid to rounded, sessile or nearly so; enclosed 1/3 or 1/2 by deep cup with appressed, narrow scales; maturing in 2 years in September;

  • 3/4”
  • deep conical cup
Flowers

in May;

Twigs

reddish brown

Buds

can be hairless or with hairy tips

Hardiness & Habitat

hardy; prefers dry, sandy, lime-free soils;

Fairly locally common on dry sandy soils in lowlands; rarely on mesic to dry uplands.
Very rarely cultivated

Additional Information

– A. Camus : 428; – Sub-genus Quercus, section Lobatae, Series Coccineae; – Close to Q.palustris , but in dry sites; resembles Q.coccinea , but darker green; – Often treated as variety of Q.coccinea ; – Hybrid with Q.velutina : Q.x paleolithicola ;