Quercus palustris

Life-forms

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids I
Ordo: Fagales

Familia: Fagaceae
Genus: Quercus
Species: Quercus palustris
Name

Quercus palustris Münchh., Hausvater 5: 253. (1770)
Synonyms

Homotypic
Quercus rubra var. palustris (Münchh.) Kuntze, Revis. Gen. Pl. 2: 642. (1991)
Heterotypic
Quercus palustris var. heterophylla Cockerell, Nat. Notes 66: 631. (1902)
Quercus rubra var. dissecta Lam., Encycl. 1: 720. (1785)

Homonyms

Quercus palustris Regel ex A.DC. = Quercus coccinea Münchh.

Distribution
Native distribution areas:
References
Primary references

Münchhausen, O.v. 1770. Ausführliches Verzeichniß aller Bäume und Stauden, welche in Deutschland in freyer Luft fortkommen. Der Hausvater 5: 79–368. Hannover: Försters und Sohns Erben. BHL Reference page. : 253

Links

Hassler, M. 2019. Quercus palustris. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2019. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2019 Apr. 29. Reference page.
International Plant Names Index. 2019. Quercus palustris. Published online. Accessed: Apr. 29 2019.
Govaerts, R. et al. 2019. Quercus palustris in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2019 Apr. 29. Reference page.
Tropicos.org 2019. Quercus palustris. Missouri Botanical Garden. Published on the internet. Accessed: 2019 Apr. 29.
IUCN: Quercus palustris Münchh. (Least Concern)

Vernacular names
العربية: بلوط سبخي
dansk: Sump-Eg
Deutsch: Sumpf-Eiche, Spree-Eiche
English: Pin Oak
español: Roble de los pantanos
suomi: Suotammi
français: Chêne des marais, Chêne à épingles
hornjoserbsce: Bahnowy dub
magyar: Amerikai mocsártölgy
lietuvių: Pelkinis ąžuolas
latviešu: Purva ozols
Nederlands: Moeraseik
polski: Dąb błotny
português: Carvalho vermelho americano

Quercus palustris, the pin oak[4] or swamp Spanish oak, is a tree in the red oak section (Quercus sect. Lobatae) of the genus Quercus. Pin oak is one of the most commonly used landscaping oaks in its native range due to its ease of transplant, relatively fast growth, and pollution tolerance.[5]

Description

Pin oak is a medium-sized deciduous tree growing to 18–22 m (59–72 ft) tall, with a trunk up to 1 m (3.3 ft) diameter. It has an 8–14 m (26–46 ft) spread. A 10-year-old tree grown in full sun will be about 8 m (26 ft) tall. Young trees have a straight, columnar trunk with smooth bark and a pyramidal canopy.

By the time the tree is 40 years old, it develops more rough bark with a loose, spreading canopy. This canopy is considered one of the most distinctive features of the pin oak: the upper branches point upwards, the middle branches are at right angles to the trunk, and the lower branches droop downwards.[5][6]

The leaves are 5–16 cm (2–6+1⁄4 in) long and 5–12 cm (2–4+3⁄4 in) broad, lobed, with five or seven lobes. Each lobe has five to seven bristle-tipped teeth. The sinuses are typically u-shaped and extremely deep cut. In fact, roughly the same amount of sinus area exists as actual leaf area. The leaf is mostly hairless, except for a very characteristic tuft of pale orange-brown down on the lower surface where each lobe vein joins the central vein. Overall autumn leaf coloration is generally bronze, though individual leaves may be red for a time, and is not considered particularly distinctive.[7] The acorns, borne in a shallow, thin cap, are hemispherical, 10–16 mm (13⁄32–5⁄8 in) long and 9–15 mm (11⁄32–19⁄32 in) broad, green maturing pale brown about 18 months after pollination.[6] Unless processed using traditional methods, the acorn is unpalatable because the kernel is very bitter.

In its natural environment pin oak is a relatively short-lived, fast-growing pioneer or riparian species with a lifespan of approximately 120 years against many oaks which can live several centuries. Despite this there are many examples of pin oak that exceed this lifespan.[8] It is naturally a wetland tree, and develops a shallow, fibrous root system, unlike many oaks, which have a strong, deep taproot when young.[5] It is confined to acidic soils, and does not tolerate limestone or sandy Florida soil, and grows at low altitudes from sea level up to 350 m (1,148 ft). The Latin specific epithet palustris means "of swamps".[6][9]

A characteristic shared by a few other oak species, and also some beeches and hornbeams, is the retention of leaves through the winter on juvenile trees, a natural phenomenon referred to as marcescence. Young trees under 6 m (20 ft) are often covered with leaves year-round, though the leaves die in the fall, remaining attached to the shoots until the new leaves appear in the spring. As with many other oak species, dead pin oak branches stay on the tree for many years.[5][6]
Leaves
Name

The Latin specific epithet palustris means "of marshland", referring to its natural habitat.[9]
Distribution

Q. palustris is mainly distributed in the eastern and central United States from Connecticut west to eastern Kansas, and south to Georgia, west to eastern Oklahoma and Kansas.[10] It is also native in the extreme south of Ontario, Canada.

The pin oak is also well adapted to life in Australia (where it has been introduced), and is quite widespread across the Australian continent, especially in the cooler southern States such as Victoria and New South Wales. It is also well adapted to life in South Africa and Argentina, especially in the Río de la Plata region.
Habitat

Pin oaks grow primarily on level or nearly level, poorly drained, alluvial floodplain and river-bottom soils with high clay content. They are usually found on sites that flood intermittently during the dormant season, but do not ordinarily flood during the growing season. They do not grow on the lowest, most poorly drained sites that may be covered with standing water through much of the growing season. However, they do grow extensively on poorly drained upland "pin oak flats" on the glacial till plains of southwestern Ohio, southern Illinois and Indiana, and northern Missouri. The level topography and presence of a claypan in the soil of these areas cause these sites to be excessively wet in winter and spring.[5]
Mature pin oak displaying typical bronze fall coloration
Flowering and fruiting

Like all oaks, flowering and leaf-out occur in late spring when all frost danger has passed. The flowers are monoecious catkins which, being self-incompatible, require the presence of another oak for pollination. Any species in the red oak group can serve as a pollinator, but in pin oak's natural range, this will usually be northern red oak or scarlet oak. Interspecies hybridization occurs freely. The acorns require two growing seasons to develop.[6]
Catkins of pin oak

Associated forest cover

Pin oak is a major species in only one forest cover type, pin oak–sweetgum, which is found on bottom lands and some upland sites throughout the central portion of the pin oak range. Pin oak and sweetgum (Liquidambar styraciflua) vary in their relative proportions in this cover type. Large areas of almost pure pin oak occur on the "pin oak flats" of the upland glacial till plains or in the bottom lands of the lower Ohio and central Mississippi River valleys.[5] Associated species in this forest type include red maple (Acer rubrum), American elm (Ulmus americana), black tupelo (Nyssa sylvatica), swamp white oak (Quercus bicolor), willow oak (Quercus phellos), overcup oak (Quercus lyrata), bur oak (Quercus macrocarpa), green ash (Fraxinus pennsylvanica), Nuttall's oak (Quercus texana), swamp chestnut oak (Quercus michauxii), and shellbark (Carya laciniosa) and shagbark (Carya ovata) hickories.[5]

Pin oak is an associated species in silver maple–American elm forests in the bottom lands along the Ohio, Wabash, Mississippi, and Missouri Rivers. A variant of this type, silver maple–American elm–pin oak–sweetgum, is found along major streams in southern Illinois and Indiana.[5]

Pin oak also occurs in black ash–American elm–red maple forests in poorly drained bottom lands in northern Ohio and Indiana along with silver maple (Acer saccharinum), swamp white oak, sycamore (Platanus occidentalis), black tupelo, and eastern cottonwood (Populus deltoides).[5]
Bark
Reaction to competition

Pin oak is classed as intolerant of shade. It is less tolerant than elm, boxelder (Acer negundo), sweetgum, hackberry (Celtis occidentalis), and ash, but is more tolerant than eastern cottonwood and black willow. Pin oak usually grows in even-aged stands of dominant and co-dominant trees. Intermediate and suppressed trees in such stands usually die within a few years of being overtopped. Single pin oaks in mixed stands usually are dominants. Pin oak is considered a subclimax species. It persists on heavy, wet soils because it produces an abundance of acorns which, if released, grow faster on these sites than most of its competitors.[5]

Pin oaks are also classified as allelopathic, meaning they crowd out or otherwise successfully compete with understory vegetation to survive.
Damaging agents

Although pin oak is very tolerant of dormant-season flooding, it is much less tolerant of growing-season flooding. Trees may be injured or killed by intermittent growing-season flooding over several successive years. The trees can usually survive one growing season of continuous flooding, but will be killed by continuous flooding over 2 or 3 consecutive years. Pin oak is rated as "intermediately tolerant" to growing-season flooding. Also, since the bark of pin oak is relatively thin, the species is especially susceptible to damage by fire and decay associated with fire wounds.[5]
Typical autumn foliage
Uses

In its native range, pin oak is the most commonly used landscaping oak along with northern red oak due to its ease of transplant, relatively fast growth, and pollution tolerance. However, as it is naturally adapted to moist, acidic soils, it may develop a condition known as iron chlorosis on less suitable locations, causing the tree to shed leaves during the growing season and rot from the top down. Mature pin oaks are often too big to treat and this nutrient deficiency on alkaline soil may eventually kill them. The drooping lower branches can also be a problem, interfering with access for traffic and pedestrians.

It is also cultivated in parks and large gardens in the United Kingdom, and has gained the Royal Horticultural Society's Award of Garden Merit.[11][12]
Largest known pin oak in New England, located in Northampton, MA. 2005 measurements: Height 107.9 ft, circumference 17.4 ft, average spread 96 ft

The wood is generally marketed as red oak, but is of significantly inferior quality, being somewhat weaker, often with many small knots.[5] The wood is hard and heavy and is used in general construction and for firewood. The bark was used by some Native American tribes to make a drink for treatment of intestinal pain.

The name "pin oak" is possibly due to the many small, slender twigs, but may also be from the historical use of the hard wood for pins in wooden building construction.[13]

The pin oak is the only known food plant of Bucculatrix domicola caterpillars.
Associated species

Due to similarity in leaf shape, the pin oak is often confused with scarlet oak and black oak, and occasionally, red oak. However, it can be distinguished by its distinctive dead branches on the lower trunk ("pins"), and its uniquely shaped crown. The sinuses on pin oak leaves are also deeply cut, often covering just as much area as the leaf itself.
References

Wenzell, K., Kenny, L. & Jerome, D. (2017). "Quercus palustris". IUCN Red List of Threatened Species. 2017: e.T194215A111279508.
Münchhausen, Otto von (1770). "Verzeichniß der Bäume und Stauden, welche in Deutschland fortkommen". Der Hausvater. Vol. 5. Hannover: Försters und Sohns Erben. pp. 253-254: diagnosis in Latin, description in German in Teutonic script.
"Quercus palustris". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew – via The Plant List.
BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
McQuilkin, Robert A. (1990). "Quercus palustris". In Burns, Russell M.; Honkala, Barbara H. (eds.). Hardwoods. Silvics of North America. Washington, D.C.: United States Forest Service (USFS), United States Department of Agriculture (USDA). Vol. 2. Retrieved September 25, 2014 – via Southern Research Station.
Nixon, Kevin C. (1997). "Quercus palustris". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). Vol. 3. New York and Oxford – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
"Oak, Pin Quercus palustris", http://www.arborday.org/treeguide/TreeDetail.cfm?id=19
"The thickest, tallest, and oldest pin oak trees (Quercus palustris)". www.monumentaltrees.com. Retrieved 2021-09-08.
Harrison, Lorraine (2012). RHS Latin for Gardeners. United Kingdom: Mitchell Beazley. p. 224. ISBN 9781845337315.
"Quercus palustris". County-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014.
"Quercus palustris". Retrieved 17 February 2021.
"AGM Plants - Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 83. Retrieved 23 September 2018.
Harlow, W. M. (1942). Trees of the Eastern and Central United States and Canada.