Fraxinus caroliniana, the pop ash, Florida ash, swamp ash, Carolina ash, or water ash, is a species of ash tree native from Cuba through the subtropical southeastern United States from southern Virginia to Texas. It was originally described by the botanist Philip Miller. It is a small tree about 40 ft. Leaves are compound, opposite, 7–12 in long, leaflets 5–7 in, ovate to oblong, coarsely serrate or entire, 3–6 in long, 2–3 in wide. Fruit is frequently 3-winged (samara) with flat seed portion; seed sometimes a bright violet color. It is the smallest of eastern North American ash species, wood light, soft, weak, 22 lbs./cu.ft. Typical to coastal swamps and subtropical lowlands. Like other species in the section Melioides, Fraxinus caroliniana is dioecious, with male and female flowers produced on separate individuals.[2]

Fraxinus caroliniana
Conservation status
Endangered  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Lamiales
Family:	Oleaceae
Genus:	Fraxinus
Section:	Fraxinus sect. Melioides
Species:	F. caroliniana
Binomial name
Fraxinus caroliniana Mill.
Natural range of Fraxinus caroliniana in the United States

The tree is threatened by the emerald ash borer, an invasive species of beetle.[3]

Climate Change and Swamp Ash

Flooding

Along the lower Mississippi River, flooding occurs during winter and spring. The trees are able to withstand the seasonal flooding.[4] However, flooding has intensified due to climate change. The National Oceanic and Atmospheric Administration found the 2019 spring floods along the Mississippi River were among some of the costliest in history.[5] Lee Jones of J. M. Jones Lumber Company says “The river has been up for so long, and for so much, that it’s killed a lot of the trees”.[4]

Future Concerns

The emerald ash borer are an invasive species from Asia.[4] The beetles damage the trees by boring holes into the wood, damaging the trees' water and nutrient transport system. These beetles have spread to 35 U.S. states and five Canadian provinces.[4][6] The emerald ash borer has not yet reached the lower Mississippi, but Jennifer Koch, a Forest Service biologist, says “it’s only a matter of time” before it affects the swamp ash[4].

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References

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[es] Fraxinus caroliniana