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

Sunday - February 05, 2006

From: New Braunfels, TX
Region: Southwest
Topic: Trees
Title: Differentiating between red oak, Shumard oak and American sycamore
Answered by: Nan Hampton

QUESTION:

I have a few trees growing in an arroyo and I'm pretty certain that they are either red oak, shumard red oak, or Texas sycamore. The trees are deciduous and have a scaled grey bark which becomes lighter and patchy as one looks up the tree. I have read that both red oak and sycamores do this. Is there a way to identify them by looking at the bark?

ANSWER:

There shouldn't be any confusion between American sycamore, (Platanus occidentalis) and the two oaks. Both the oaks generally have deep vertical ridges on them. The sycamore's older bark is thinner and is not ridged as deeply as the oaks. The sycamore's younger bark is without ridges and often has green, tan and white patches. Also, if your trees are mature sycamores, you should see some of the fruits on the ground or still hanging on the tree. Robert Vines in Trees of Central Texas gives this description of the barks of the three trees:

1. Sycamore (Platanus occidentalis) bark: 'Reddish brown, scaling off in thin plates to expose the conspicuous white, or greenish, new bark."
2. Shumard oak (Quercus shumardii) bark: "Grey to reddish brown, smooth or broken into small tight interlacing ridges.
3. Texas oak (Q. texana) bark: "Dark grey to black with thick short ridges and platelike scales, fissures deep."

You are likely to have a bigger problem distinguishing between the Shumard oak (Quercus shumardii) and the Texas oak (Q. texana, synonym=Q. buckleyi)—also known as Red oak, Spanish oak, or Nuttall oak—by the bark alone; or, for that matter, even after they leaf out and produce acorns. Indeed, Robert Vines (Trees, Shrubs and Woody Vines of the Southwest. 1960. Austin: University of Texas Press) says that "The close relationship of Texas Oak and Shumard Oak has been a botanical classification problem. Some botanists prefer to classify the two as separate species, but others prefer to reduce Texas Oak to a varietal of Shumard Oak and give it the name of Q. shumardii var. texana (Buckl.) Ashe."
 

More Trees Questions

Effects of drought and insects on junipers
August 06, 2007 - We live on acreage about 18 miles southwest of Austin. Ever since we moved here about 6 years ago, we've noticed that our mature Ashe junipers seem to be in some sort of decline with foliage graduall...
view the full question and answer

Treatment of black mildew on magnolia
April 17, 2008 - I think my magnolia has black mildew. How do I treat it?
view the full question and answer

Stage of maturity for redbud trees bloom
April 01, 2003 - At what stage of maturity will Redbud trees bloom?
view the full question and answer

Anacacho orchid not leafing out in Georgetown TX
April 18, 2013 - February 2012 I planted 2 4-ft anacacho orchids which did well. This spring, they have yet to leaf out or even bud. There is green, however, when I scratch the stems and some suckers at the bottom of ...
view the full question and answer

Citrus trees for Austin
May 21, 2008 - I am looking for citrus that grows in the Austin,Tx area. Could you offer any suggestions please?
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