En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Which one is huajillo and which one is guajillo?

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
2 ratings

Tuesday - November 19, 2013

From: Bastrop, TX
Region: Southwest
Topic: General Botany, Plant Identification
Title: Which one is huajillo and which one is guajillo?
Answered by: Nan Hampton

QUESTION:

Recently I attended a field trip to the Leonard Garden at the Kleberg Institute in Kingsville. I took a picture of a tree that was referred to as Tenaza or huajillo. Later I took another photo of a Thornless Catclaw which was referred to a guajillo. They both looked liked acacias to me. According to your database, huajillo is an alternative name for both of these trees. However, guajillo is only attached to the Thornless catclaw. So, I'm confused. Would you please enlighten me? I know, I should use the scientific names, but.. Thanks, Judy

ANSWER:

This is the problem with common names.  The same common name may refer to one plant in one place or to one person; but, in another place or to another person, it will mean a completely different plant.  Here's a "for instance"—in our Native Plant Database try searching for "frostweed".  The search results in 8 plants with 8 different species names.  The one we know in Central Texas as "frostweed", Verbesina virginica (Frostweed), is not only a different species than the other seven, but it is in a different genus, as well.  There are many more examples of one common name used for several different species of plants.  That is why it is always best to use the botanical name if you are referring to a particular species of plant.  

You have already noticed the confusion between which plant is guajillo, huajillo, or huajilla.

In our Native Plant Database Acacia berlandieri (Guajillo) is also called Berlandier acacia, Thornless Catclaw, Mimosa Catclaw, Round-flowered Catclaw, Huajillla and Matoral.  It is in the Genus Acacia, i.e., it is an acacia.   USDA Plants Database gives the common name as 'guajillo'.  Texas A&M Aggie Horticulture calls it 'guajillo' or 'huajilla'.

In our Native Plant Database Havardia pallens (Tenaza) is also called Huajillo and Ape's ear-ring.  Its botanical synonym (what it was formerly known as) is Pithecellobium pallens.  You can see more synonyms and more taxonomic information on the USDA ARS-GRIN page.  It is in the Genus Havardia so it isn't an acacia; however, it does look a lot like the Acacia berlandieri.  The two plants are both in the Family Fabaceae (Pea Family) but the botanical taxonomists have seen a difference in the two that they considered significant enough to separate them into two different genera.  USDA Plants Database gives the common name as 'huajillo'.  Texas A&M Aggie Horticulture calls it 'guajilla' or 'huajillo'.

In the Manual of the Vascular Plants of Texas by D. S. Correll and M. C. Johnston (1970, Texas Research Foundation), the key separates the two species by this characteristic: 

  • Acacia berlandieri:  "Stamens are free to the top of the floral cup or nearly so".  The common name is listed as 'Guajillo'. 
  • Pithecellobium pallens (or Havardia pallens):  "Stamens united above the floral cup forming a tube 2-5 mm. long."  The common name is listed as 'Tenaza'.

Obviously, there are other differences.  See, for instance, the differences between the two by comparing their characteristics as listed on the Texas A&M Aggie Horticulture pages referred to above.

Just to make things worse, Robert A. Vines in his book, Trees, Shrubs and Wood Vines of the Southwest.  (1960, University of Texas Press) says that, as well as Acacia berlandieri, Acacia angustissima (Prairie acacia) is also called 'guajillo' and 'huajilla'; Acacia greggii (Catclaw acacia) is called 'huajilla'; and Havardia pallens (known in his book by the synonym, Pithecellobium pallens) is called 'huajillo' and 'guajilla'.

Guajillo, guajilla, huajillo and huajilla appear to be variations in spelling.  I checked several Spanish dictionaries for a translation for any of these words but found none.   I tried on the Internet and the only ones I found were for a guajillo (guajilla) chile or a reference to one of the trees/shrubs, usually Acacia berlandieri.

At this point, you may be sorry you ever asked the question. The takeaway is, however, that the assignment of common names to plants (or animals, for that matter) is not controlled; so, you may get several different unrelated plants bearing the same common name—or, one species of plant with several common names.   The botanical names are controlled.   They do occasionally change but you can usually find the trail of the change and know fairly well what plant you mean by using its botanical name.

 

More General Botany Questions

Comments on white-flowered Mountain Laurel from Austin
December 23, 2012 - Following up on the August 23, 2012, question from Driftwood about the white-flowering mountain laurel, I have found a few more leads to explore. First, there are four more images of white-flowering m...
view the full question and answer

Plants for a hillside in WI
February 18, 2012 - I live in Wisconsin and am currently doing a research project on plant variation on the north and south sides of a hill. I was wondering you could suggest any books to me that would address this issue...
view the full question and answer

Source for DNA sequencing of Opuntia species
March 04, 2014 - Hi Mr. Smarty Plants, I am trying to do a Opuntia speciation study, and rather just identifying the species by morphological comparison, I would also like to go a little deeper by comparing the DNA...
view the full question and answer

Have invasive plants no useful purpose from Anchorage AK
September 03, 2011 - Does the definition of invasive plants include that the plant has no useful purpose? Thanks.
view the full question and answer

Trillium phototropism
May 16, 2010 - I'm SURE you haven't had this question before. I live in northern Michigan in a wooded subdivision where we have clouds of wild grandiflorum trilliums growing in the woods on either side of the roa...
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