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
Not Yet Rated

Monday - May 20, 2013

From: Leander, TX
Region: Southwest
Topic: Plant Identification, Herbs/Forbs
Title: Identity of a yellow-flowered wildflower with prickly burs
Answered by: Nan Hampton

QUESTION:

Hi there. We have seen a wildflower, probably invasive, that is at least in Travis, Williamson, and Hays counties. We have tried to identify it without success, The structure of the plant is remarkably similar to Malta Starthistle, but the yellow flower is daisy-like, not brushy like a thistle. The plant has horrific little burs with spikes, again like Malta Starthistle, but with shorter spikes. They are a serious enemy to barefoot people. They seem to like disturbed areas along roadsides in full sun. I never saw them five years ago when I bought my land north of Jonestown, and now they are everywhere. Any help would be appreciated.

ANSWER:

For purposes of comparison, here is a link to Centaurea melitensis (Malta star-thistle), a native of Africa and Europe.

Here are a couple of possibilities for the plant you are seeing:

Solanum rostratum (Buffalobur nightshade) is a Central Texas native.  It has spines on its stems and spiny burs as seed cases.

Tribulus terrestris (Puncturevine) is native to southern Europe, southern Asia, Africa and Australia.  The spines are short and stout and can puncture bicycle tires! Here are photos and more information from Texas Invasives and University of California Integrated Pest Management.

 

 

From the Image Gallery


Buffalobur nightshade
Solanum rostratum

Buffalobur nightshade
Solanum rostratum

Buffalobur nightshade
Solanum rostratum

Buffalobur nightshade
Solanum rostratum

More Herbs/Forbs Questions

Petunias pollinated by clematis from Logansport IN
July 11, 2012 - Can petunias be pollinated by clematis? I have 2 petunias that have split blooms and look like a small clematis flower. They are growing close to a jackamani clematis.
view the full question and answer

Should Mexican milkweed (Asclepias curassavica) not be used to attract Monarch butterflies?
November 20, 2015 - Should I remove Asclepias curassavica (Mexican milkweed) in my garden for threat of OE parasitic protozoan threat to Monarch butterflies? Is this threat as widespread as Chronicle implies? I had great...
view the full question and answer

Plants to grow in shady area near a pecan tree in Maryland
March 26, 2013 - I live on the Eastern Shore of Maryland. I have planted only natives in my front lawn. My backyard, which sports a pecan tree, fir, fig tree, and others I can't identify is dirt, just dirt. I have...
view the full question and answer

Destruction of Straggler Daisy in Austin
December 18, 2011 - I hate Straggler Daisy. Not to be offensive, but it appears from other posts on this site that you, Mr. Smarty Plants, and many others would like to treat it as a protected species. It is taking over ...
view the full question and answer

Golden groundsel plants or seeds for Bulverde TX
October 02, 2011 - Where can I find golden groundsel, plants or seeds?
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP | STAFF
© 2016 Lady Bird Johnson Wildflower Center