Quercus myrtifolia, the myrtle oak,^[3] is a North American species of oak. It is native to the southeastern United States (Mississippi, Alabama, Florida, Georgia, South Carolina). It is often found in coastal areas on sandy soils.^[4]

Quick Facts Myrtle oak, Conservation status ...

Myrtle oak
Leaves and acorns of myrtle oak
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Fagales
Family:	Fagaceae
Genus:	Quercus
Subgenus:	Quercus subg. Quercus
Section:	Quercus sect. Lobatae
Species:	Q. myrtifolia
Binomial name
Quercus myrtifolia Willd.
Synonyms[2]
List Quercus aquatica var. myrtifolia (Willd.) A.DC. Quercus myrtifolia f. ampla Trel. Quercus nitida Raf. Quercus phellos var. arenaria Chapm. Quercus phellos var. myrtifolia (Willd.) Wenz.

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It is an evergreen tree that can reach 12 meters (39 feet) tall, also appearing as a shrub in drier sites. It has leaves with no teeth or lobes, which are hairless on the upperside and also on the underside except along the veins.^[5]

This plant was first identified by Carl Ludwig von Willdenow.^[6] Some synonyms for Quercus myrtifolia are Quercus nitida, Quercus aquatica var. myrtifolia, Quercus myrtifolia f. ampla, Quercus phellos var. arenaria, and Quercus phellos var. myrtifolia.^[7] The common name is the Myrtle Oak^[8]

The Myrtle Oak often grows as a shrub, but can also take the form of a tree. In maturity it grows to 15-20 feet tall and 8-10 feet wide. It is considered a red oak.^[9] The leaves are simple alternate.^[10] They appear dark green with a yellow-green underside. The leaves have a leathery texture, and an obovate shape.^[10] There are small hairs on the underside of the leaves.^[11] The acorns are about 1/2" long, and mature in 18 months.^[12] Small green flowers bloom in April-May.^[9] It has a grey smooth stem that furrows in maturity. Twigs can be reddish brown when they are younger.^[10] A commonly associated oak of Q. myrtifolia is Quercus geminata. However, the leaf of Q. geminata is a narrow elliptic shape and has a wrinkled appearance. Quercus myrtifolia also grows better in shaded and upper dune environments.^[13]

Quercus myrtifolia is present in the southeastern United States.^[8] It occurs in sandy soils along coastlines up to 350 ft above sea level.^[9] Habitats are dry sandy ridges in scrub oak forests with yellow pines, and dry-site hardwood forests.^[14] The most common trees it grows with are Quercus incana, Quercus laevis, Quercus marilandica, Quercus margaretta, Quercus geminata, and Quercus virginiana.^[14]

This plant is mostly used in gardening as a backdrop or accent plant. It is very low maintenance and its evergreen leaves provide cover during the winter.^[15]  It may also have medicinal uses. The bark may be used as an antiseptic and hemostatic. It may even be useful for treating tooth aches, gastropathies, burns, and reduce inflammation.^[16] These types of medicinal uses are typical of many oak trees.^[17]

Increased levels of CO2 in the environment of Quercus myrtifolia led to a decrease in leaf area. Additionally, this also led to an increase in sugar and starch content.^[18] Higher levels of CO2 led to lower occurrence of leaf asymmetry this can better protect leaves from leaf miners.^[19] Prescribed burns may be beneficial to the recruitment of Q. myrtifolia seedlings.^[20] It is also possible that mature Myrtle Oaks eventually stop producing acorns making fires important for the growth of new trees.^[21] Prescribed burns may be beneficial to the recruitment of Q. myrtifolia seedlings.^[20] Quercus myrtifolia displays resiliency to prescribed and lightning caused burns on the Florida Lake Wales Ridge.^[22] After palmetto scrub fires Q. myrtifolia managed to reach preburn values within 5 years.^[23] Seasonal drought can have a large impact on the Q. myrtifolia. A dry spring season is known to greatly decrease its growth rate.^[24] Myrtle Oak is also considered to be extremely wind resistant.^[25]

A variety of insects feed on the Myrtle Oak including oak skeletonizer, leaf miner, galls, oak lace bugs, borers, and caterpillars.^[9] Burrowing beach mice threaten acorns even when protected by cages.^[26] Hibiscus mealybugs are also known to host in the tree.^[27] Like all oaks, Quercus myrtifolia is susceptible to oak wilt.^[9] Seeds with holes in them may be infested with weevils.^[28]

The Myrtle Oak can be used as an accent plant in garden settings. Despite this it is rarely available in nurseries. If growing a Myrtle Oak one should plant in full sun and well drained soil. It is very drought resistant.^[29]  If it is planted outside it should be protected from pests, and buried at a depth equal to the diameter of the acorn.^[30]

Myrtle Oak is considered critically imperiled in South Carolina, imperiled in Mississippi, and vulnerable in Georgia.^[31]