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Compare sources for Quercus marilandica

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Field
Oaks of the World
The Sibley Guide to Trees
Common Names
blackjack oak
Blackjack Oak, Barren Oak, Black Oak, Jack Oak
Geographic Range

East and Southeast USA; to 1000 m; introduced in Europe in 1739;

Growth Habit

3-9 m (sometimes more, to 17 m); crown rounded, low, irregular;

Deciduous, Small or medium tree usually under 50’ tall. Often scrubby with drooping branches.

Leaves

6-15 x 5-10 cm; oboval; 3 (rarely 5) pointed lobes at apical 1/2; base cuneate; leathery, thick; shiny green above; rusty tomentose beneath; midrib white; petiole pubescent 2-3 cm long;

  • 6”
  • short petiole
  • blocky T-shaped or triangular
  • thick and leathery
  • underleaf sometimes bright rust-yellow
  • stand stiff around twig tips
Fruits (Acorns)

acorn 1-2 cm, globose or nearly so; pale brown; stout peduncle 0.5 cm long; enclosed 1/2 by cup; cup top-shaped, with tomentose scales;

  • 3/4”
  • deep goblet shaped cup
  • scales loose
Flowers

staminate and pistillate in early summer;

Bark

dark in squarish blocks with deep fissures

Twigs

ashy brown hairy

Buds

tawny hairs

Hardiness & Habitat

hardy; prefers lime-free, sandy soils, even poor; slow-growing;

Locally common in poor, dry soils; dry ridhes, barrens, disturbed fields. Often with stellata.
Rarely cultivated

Additional Information

– A.Camus : n° 415; – Sub-genus Quercus, section Lobatae, subsection Phellos; – Described in 1704 after a tree from Maryland ; very rare in Europe ; – Hybridizes with : Q.velutina (= Q.x bushi i Sarg.), Q.ilicifolia (= Q.x brittonii ), Q.imbricaria (= Q.x tridentata ), Q.phellos (= Q.x rudkini ) ;

In TX and OK a var. with smaller leaves, ashei is recognized.