En EspaŅol

Q. Who is Mr. Smarty Plants?

A: There are those who suspect Wildflower Center volunteers are the culpable and capable culprits. Yet, others think staff members play some, albeit small, role. You can torture us with your plant questions, but we will never reveal the Green Guru's secret identity.

Help us grow by giving to the Plant Database Fund or by becoming a member

Did you know you can access the Native Plant Information Network with your web-enabled smartphone?

Share

Ask Mr. Smarty Plants

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

Are the berries of Gun bumelia poisonous to dogs from Willow Park TX
February 13, 2014 - We have been told we have a Bumelia Lanuginosa (Chittamwood) tree in our yard. My dog has been eating the berries. (She has had stomach issues for several months and only recently found out she has ...
view the full question and answer

Are seeds of trumpet vine poisonous from Creston BC
September 12, 2013 - Are the seeds in the trumpet vines pods poisonous to humans or can I use them as dried beans? I have one plant that covers most of my house's south wall. It is a very established plant.
view the full question and answer

Non-toxic, non-invasive native flowers for horses
October 12, 2008 - Hi I have a couple areas in and bordering horse pastures that I would like to plant with native flowers. I can find lists of toxic flowers but not non toxic native ones. Id like non -toxic non-invas...
view the full question and answer

Damaged leaves on bottlebrush buckeye from Glen Mills PA
June 09, 2013 - My recently planted bottlebrush buckeye plants' leaves are looking damaged but it doesn't look like insect or fungus damage. They look battered by wind but I don't understand why that would happen...
view the full question and answer

poisonous landscaping plants in New Mexico
November 21, 2011 - Mr. Smarty Plants, I have been given the task of finding non poisonous plants and shrubbery to add to our new children's playground. This is a Head Start playground so I have to make sure anything w...
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