This Plant Can Burn Your Skin With Its Sap—And It May Be Coming to Your Neighborhood

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It's huge, it's extremely dangerous, and it's spreading. The giant hogweed (Heracleum mantegazzianum) contains a corrosive sap that causes severe rashes, third-degree burns, and even permanent blindness if you get the photosensitive chemicals on your skin or in your eyes, Science Alert reports.

The noxious, invasive weed was just identified in Clarke County, Virginia, near the Massey Herbarium at Virginia Tech. That brings the number of states it's been spotted in to 11, including Washington, Oregon, Illinois, Michigan, North Carolina, Pennsylvania, New York, Connecticut, Massachusetts, and Maine. Beyond the U.S., it has taken root all over the world, from the UK to Iceland to Australia.

Similar to the common but slightly less dangerous cow parsnip, giant hogweed is native to Central Asia and was first brought to North America in the early 1990s as an ornamental plant, its unique shape making it popular among gardeners. But it soon became invasive: Once it’s established in an area, it can take up to five years to eradicate a colony.

Now the plant is considered a public health concern. Hogweed can cause a reaction known as phytophotodermatitis when it comes into contact with skin that is subsequently exposed to UV rays—but the effects of hogweed are much more severe. A painful blister can develop within hours and last for months; the exposed skin can remain sensitive to sunlight for years even after the blisters heal.

Hogweed can be difficult to distinguish from the cow parsnip, and the plant is often misidentified. First, check for height: Hogweeds are typically taller than 8 feet, while cow parsnip tends to be 5 to 8 feet tall. Hogweed stems are green with purple specks and coarse white hairs, while parsnip stems are green with fine white hairs. For more tips and photos, check out the New York Department of Environmental Conservation’s guide.

If you see a plant you think might be a giant hogweed, take a few photos and send them to your state's department of agriculture to identify—and whatever you do, don't touch it.

[h/t Science Alert]

The Tree That Inspired Dr. Seuss's The Lorax Has Fallen Over

Rhododendrites, Wikimedia Commons // CC BY-SA 4.0
Rhododendrites, Wikimedia Commons // CC BY-SA 4.0

The Truffula trees at the center of The Lorax may have been a product of Dr. Seuss's imagination, but it's believed they were inspired by a real-life tree in La Jolla, California. Nearly 50 years after the environmental parable was published, Smithsonian reports that the iconic Monterey cypress has fallen.

The tree had grown for 80 to 100 years in what is today Ellen Browning Scripps Park in Southern California. It was clearly visible from the observation tower where Theodor Geisel, a.k.a. Dr. Seuss, lived in La Jolla following World War II.

While the children's book author and illustrator never stated that the tree inspired his work, locals started referring to it as "The Lorax Tree." The resemblance it bears to Seuss's Truffula is undeniable: Both have skinny trunks with whimsical curves and thick, fluffy canopies of foliage concentrated at the top.

In The Lorax, the Truffula trees are threatened by the Once-ler, who wants to chop them down and turn them into garments called Thneeds. The title character "speaks for the trees" and conveys the book's environmentalist message.

Unlike the Truffula, La Jolla's Monterey cypress appeared to be in no danger until it recently toppled over. Arborists aren't sure what caused the collapse, as they hadn't noticed any prior health issues with the tree except for some termites. The past year's uncharacteristically wet winter and the effect it had on the surrounding soil may have played a role, so experts are looking into that possibility.

Most of the tree has been removed from the area, and the city plans to plant another tree in its place. There are also plans to salvage and repurpose the trunk from the fallen tree, though they haven't been made official.

[h/t Smithsonian]

Tourists Are Picking Apart Britain's Oldest Tree

Paul Hermans, Wikimedia Commons // CC BY-SA 3.0

The Fortingall Yew in the Fortingall churchyard in Perthshire, Scotland has seen a lot. Since it started growing at least 2000 years ago, it's been present for the Roman settlement of Scotland, the shift from paganism to Christianity, and the country's induction into the United Kingdom. But after standing for millennia, the ancient tree is facing its greatest threat yet. Tourists are removing twigs and branches from the tree to take home as souvenirs, and the tree is under so much stress that it's spontaneously changing sexes, Atlas Obscura reports.

Because of how the tree grows, it's hard to date the Fortingall Yew precisely. It comprises several separate trunks that have hollowed out over the years, making it easier for the tree to support itself in its old age. Based on historical measurements and 19th-century ring counts, the yew has been around for at least two millennia, but it could date back as far as 5000 years. That makes it the oldest tree in Britain and one of the oldest living things in Europe.

That impressive title means the tree gets a lot of visitors, not all of whom are concerned with extending its lifespan even longer. A stone and iron wall built in the Victorian era encloses the tree, but that hasn't stopped people from climbing over it to break off pieces or leave behind keepsakes like beads and ribbons.

As the abuse adds up, the tree has responded in concerning ways. It sprouted red berries this spring, a sign that the tree is transitioning to a different sex for the first time in its life. Yew trees are either male or female, and sex changes among the species are incredibly rare and misunderstood. Some botanists believe it's a reaction to stress. The change may be a survival mechanism intended to increase the specimen's chances of reproducing.

Scientists aren't sure why this particular yew, which was formerly male, sprouted berries on its upper branches, an exclusively female characteristic, but they've collected the berries to study them. The seeds from the berries will be preserved as part of a project to protect the genetic diversity of yew trees across the globe.

In the mean time, caretakers of the Fortingall Yew are imploring visitors to be respectful of the tree and keep their hands to themselves.

[h/t Atlas Obscura]

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