Pin Oak (Swamp Spanish Oak)
Kingdom: Plantae, Division: Tracheophyta, Class: Magnoliopsida, Order: Fagales, Family: Fagaceae, Genus: Quercus, Species: Quercus palustris · Fagaceae (Beech/Oak family) · Simple, deciduous leaf
Species
Quercus palustris
Leaf Type
Simple, deciduous leaf
Family
Fagaceae (Beech/Oak family)
Shape
Deeply lobed with 5 to 7 lobes, having narrow, bristle-tipped teeth
Size
Approximately 3 to 6 inches long and wide, typical for mature pin oak specimens
Margin
Deeply lobed and bristle-tipped
Arrangement
Alternate
Rarity
Very Common
Color & Pattern
Medium to dark green on the upper surface, paler green below with tufts of hair in the vein axils; turns vibrant bronze to red in autumn
Venation Pattern
Pinnate venation with prominent midrib and primary veins
Texture & Surface
Glabrous (smooth) on top, slightly pubescent in vein axils on the underside, thin and papery texture
Description
Quercus palustris, commonly known as the pin oak, is a medium-sized deciduous tree recognized by its distinctive growth habit with lower branches drooping, middle branches horizontal, and upper branches ascending. The bark is gray and relatively smooth, becoming slightly ridged with age. It produces small acorns and features deeply cut, brilliant autumn foliage.
Key Features
Deeply lobed leaves with bristle-tipped teeth, lower branches that persist on the trunk and point downward, and small acorns with saucer-like caps
Habitat
Typically found in moist to wet bottomlands, floodplains, and poorly drained soils, though widely planted as an urban street tree
Geographic Range
Native to eastern and central North America, ranging from New England west to Kansas and south to Arkansas and Tennessee
Condition Notes
The foliage appears healthy, vibrant green, and well-developed with no notable signs of chlorosis, disease, or heavy insect damage
Interesting Facts
Pin oaks get their common name from the numerous small, pin-like dead branchlets that persist along the trunk, or from the use of its hard wood historically for pins in wooden shipbuilding
Medicinal & Uses
Extensively used as an ornamental shade and street tree due to its tolerance of urban conditions and clay soils; wood is used locally for general construction, pallets, and firewood
Ecological Role
Provides vital food and habitat for numerous wildlife species, including squirrels, wild turkeys, and various migratory birds that feed on its acorns; plays an important role in bottomland forest ecosystems
Similar Species
Scarlet Oak (Quercus coccinea) and Northern Red Oak (Quercus rubra); pin oak can be distinguished by its deeply cut sinuses that extend almost to the midrib and its downward-pointing lower branches
Foraging Tips
Look for trees with drooping lower branches near wet woods, streams, or planted extensively in suburban parks; collect fallen leaves and acorns in autumn
Toxicity Warning
Non-toxic to humans, though acorns contain tannins which can be mildly toxic to horses and dogs in large quantities due to digestive upset