En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - North American Plants with Poisonous Thorns

Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

Search Smarty Plants
    
 
See a list of all Smarty Plants questions
Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.

Need help with plant identification, visit the plant identification page.
 
rate this answer
3 ratings

Thursday - December 01, 2011

From: Knoxville, TN
Region: Southeast
Topic: Poisonous Plants
Title: North American Plants with Poisonous Thorns
Answered by: Becky Ruppel

QUESTION:

Are there any plants in North America that possess poisonous thorns?

ANSWER:

In North America 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.  Many members of the nightshade family (Solanaceae) have many poisonous parts (i.e. leaves, stems, fruit, roots, seeds) that cause severe irritation to mammals.  The members of this family are widely distributed across North America. 

Another group of plants that have poisonous “thorns” is Stinging Nettles.  They have tiny hairs on the underside of their leaves that ‘sting’ and cause skin irritation and a burning sensation if they are brushed against. 

Finally, most plants that have thorns can cause mechanical injury, and some injuries result in pieces of the thorn breaking off in the skin.  It would seem as if these plants had poison, but in fact, the swelling and redness around a wound is caused by a foreign object logged in the skin. 

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 with thorns. 

 

More Poisonous Plants Questions

Toxicity of Lupinus ssp. (bluebonnets)
June 25, 2007 - Are bluebonnets toxic to cattle?
view the full question and answer

Identification of shrub/small tree with small purple fruit
July 31, 2013 - Hi! I have a tree/bush that has come up on its own in the backyard. This year it set what looks like small purple plums. Is there any chance that they might be poisonous?
view the full question and answer

Is purple grass poisonous if eaten by a dog?
June 04, 2009 - Is purple grass poisonous if eaten by a dog?
view the full question and answer

Trumpet flower side effects
July 06, 2005 - What happens if you eat a trumpet flower, what are the side effects and dangers?
view the full question and answer

Non-native vines poisonous to animals from Park Ridge IL
June 18, 2012 - I have a Star Jasmine and sambac Philipine Jasmine Plant . Are they poisonous to cats or dogs. I have them in the house.
view the full question and answer

Smarty Plants's Facebook profile Support the Wildflower Center by Donating Online or Becoming a Member today.

Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP
© 2014 Lady Bird Johnson Wildflower Center