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Field

Oaks of the World

The Sibley Guide to Trees

Common Names

Arkansas oak, water oak

Arkansas Oak, Arkansas Water Oak, Water Oak

Geographic Range

Arkansas; Southwest Georgia; Northwest Florida; Alabama; Eastern Texas; from 50 to 150m;

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Growth Habit

reaches 18 m high, but most often 6-9 m;

Deciduous, small understory tree usually under 50’

Leaves

5-13 cm long, 2.5-6 cm wide; oboval to rhomboid; margin entire or slightly lobed near apex (rare lobes, weakly pointed); base cuneate; apex rounded; yellow green, glabrous above, paler beneath with axillary tufts; petiole 5-25 mm long, pubescent;

4 1/2”
small and broad with rounded bases
underleaf pal green
similar to marilandica but leaves more rounded, less leathery, and greenish below
closely related to nigra but leaves broader, bark darker, and rougher

Fruits (Acorns)

acorn solitary or paired, 1.2 cm long, globose, sessile or short-stalked; shallow cup enclosing 1/4 to 1/3 of nut;

5/8”
thin shallow cup

Flowers

in spring;

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Twigs

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gray hairs

Hardiness & Habitat

hardy; prefers sandy, rocky, moist and well-drained, lime-free soils; slow growing, short living;

Rare and local in well-drained sandy soil, often in understory of hardwood forest
most numerous in SW AR
not cultivated

Additional Information

– Sub-genus Quercus, section Lobatae, sub-section Phellos; – Threatened (IUCN Red List Category : VU). – Discovered in Arkansas in 1911; – Hybridizes with Q.nigra, Q.marilandica, Q.phellos and with Q.incana (= Q.x venulosa )

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