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www.reference.com/science/trees-poisonous-thorns-f2ca6711647410ac

In other parts of the world, there are a few more plants that have poisonous thorns. A Madagascar native and common houseplant known as the crown of thorns (Euphorbia milii) secretes a latex sap when damaged. If forced onto or underneath the skin, it can cause a poison-oak-type reaction.

www.gardenguides.com/99902-poisonous-plants-thorns.html

In the continuing struggle to survive, many plants have developed adaptations to cope with predation. One of these tactics is to produce sharp thorns. This deters large grazing animals from stripping all of the foliage. Another method of protection is for a plant to produce chemicals that either kill or deter an ...

homeguides.sfgate.com/dangerous-thorns-hawthorn-tree-59377.html

With their plentiful dagger-sharp thorns, it's not hard to understand how the hawthorn tree got its name. Depending on the variety of hawthorn, the thorns on the trees' branches, twigs and even ...

www.wildflower.org/expert/show.php?id=7663

Considering plants outside of North America there are several plants from Africa that have poisonous thorns such as Gymnosporia buxifolia or Dichrostachys spp. I acquired my information about thorny plants from the Botanical Dermatology Database. There is lots of information there if you would like to read further about the affects of plants ...

www.popularmechanics.com/science/environment/g2924/9-plants-deadly

These 9 Plants Will Mess You Up. ... Plants have evolved all sorts of wickedly clever defense mechanisms, and the most primal—and effective—are thorns, prickles, and spines. Spiny plants can ...

www.quora.com/Which-plants-have-poisonous-thorns

There are few plants that have poisonous thorns. * The members of the Solanum (nightshade) genus have thorns and are reported to cause injuries that are slow to heal due to poisonous thorns. * Another group of plants that have poisonous “thorns” i...

www.medicinenet.com/plant_thorn_synovitis/article.htm

The plants that commonly cause plant thorn arthritis are those that produce thorns. These plants include palm trees, roses, black-thorn shrubs, cacti, bougainvillea, yucca, pyracantha, plum trees, and mesquite trees. Exposure to these plants is the greatest risk factor for plant thorn arthritis.

en.wikipedia.org/wiki/Honey_locust

Honey locust seed pods ripen in late spring and germinate rapidly when temperatures are warm enough. Honey locusts commonly have thorns 3–10 cm (1 1 ⁄ 4 –4 in) long growing out of the branches, some reaching lengths over 20 cm (8 in); these may be single, or branched into several points, and commonly form dense clusters.

homeguides.sfgate.com/palm-tree-puncture-wound-treatment-32058.html

Some species of palm trees can be dangerous if you touch them in the wrong spot. Sharp thorns on various parts of the trees can puncture the skin and cause bacterial or fungal infections.

www.hunker.com/13426412/the-danger-of-bougainvillea-thorns

The thorns of bougainvillea are coated with a substance that can cause contact dermatitis. Symptoms include a rash, pain or tenderness and itching. The wound should be kept clean, and treated with creams containing hydrocortisone and wet dressings to decrease itching and discomfort.