Stanfield's Beebalm, Monarda stanfieldii

On Oct 30, 2016, botanist Bill Carr led a native plant identification field trip to the private Spicewood Ranch in Burnet County, TX. The field trip was organized by Environmental Survey Consulting.

Bill showed us a population of the Texas endemic Stanfield's Beebalm, Monarda stanfieldii. He admitted that he had originally misidentified it as M. punctata. But on further study realized it was M. stanfieldii.

The major distinguishing feature between these two species is that in M. stanfieldii, the mouth of the calyx is closed by a dense mass of white to silvery hairs. In M. punctata the calyx is open and merely ciliate.

And fortunately, these distinguishing characters can still be observed after the leaves and corollas have dried up and disappeared (as they had in this population in late October).

First, see this photo of M. punctata from Note that the mouth of the calyx is ciliate, but still open:

Monarda punctata

Now compare with this photo of M. stanfieldii I took during the field trip. Note that the mouth of the calyx is closed with a mass of white hairs:

Monarda stanfieldii

You can see even more detailed photos of this specimen in my observation attached below. Be sure to select the "original" size in order to see all the glorious macro detail.

Also, see this Monarda key to Texas species for reference:

M. stanfieldii has a very limited range, restricted to sandy areas along the Colorado and Pedernales Rivers on or downstream of the Llano Uplift (Blanco, Burnet, Gillespie, Llano and Travis counties). But note that BONAP shows a specimen record from Robertson County. This seems out of range based on the current understanding of the desired ecological region of this species. Here is the M. stanfieldii distribution map from BONAP (Robertson County is the easternmost county in yellow on the map):

Monarda stanfieldii

Distribution map citation:
Kartesz, J.T., The Biota of North America Program (BONAP). 2015. Taxonomic Data Center. ( Chapel Hill, N.C. [maps generated from Kartesz, J.T. 2015. Floristic Synthesis of North America, Version 1.0. Biota of North America Program (BONAP). (in press)]

The details above are summarized from the notes and discussion provided by Bill Carr. Any errors are surely mine.

Lähettänyt billdodd billdodd, 4. marraskuuta 2016 21:38


Kuvat / Äänet




Lokakuu 2016


Texas, US (Google, OSM)


For notes on this species including identification, see my journal post:


Wow -- way cool! :)

Lähettänyt sambiology noin 6 vuotta sitten (Lippu)

Very nice summary and record of a unique opportunity to learn from one of the best! Thanks for posting!

Lähettänyt mikaelb noin 6 vuotta sitten (Lippu)

May I ask a question that will make me sound like a Luddite? How do you embed photos into your journal posts??? :-/

Lähettänyt sambiology noin 6 vuotta sitten (Lippu)

Hey Sam,

Sure. You just need to embed a snippet of html in the post. Here's the syntax:

<img src="url" alt="some_text" style="width:width;height:height;">

For a concrete example, here is what I used for the first image above:

<img src="" alt="Monarda punctata" style="width:648px;height:593px;">

Hope that helps. Feel free to ping me with any questions/clarifications.

Lähettänyt billdodd noin 6 vuotta sitten (Lippu)

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