Friday, May 12, 2023

Tree-following: What to do on a windy Wyoming day?

Mid-photo are the two Rocky Mountain Junipers I'm following, at the base of the Laramie Mountains.

The approach was not a problem.
A few days ago I made a short excursion to visit the junipers I'm following this year. Average wind speed was 28 miles per hour, with gusts to 40. From a distance this wasn't a problem. But up close the trees were frantically waving in the blustery southeasterly wind, portent of an approaching storm system. Indeed it rained buckets the next two days!
Photo at highest shutter speed allowed.
So I took photos of a neighboring plant instead. It was less than 2 cm tall and not much bothered by the wind.
Even after wandering out here all these years, I'm still impressed and astonished that plants can become established and survive in a tiny crevice or depression in bare rock, exposed to the desiccating Wyoming wind. I wonder how old this one is?
The leaves are covered in silky hairs.
The scientific name of this plant is Tetraneuris acaulis (Pursh) Greene var. caespitosa A. Nels. There's an interesting bit of history encoded here. F.T. Pursh was the first to name the species (Gaillardia acaulis), in 1814. Then in 1898, E.L. Green moved it to the genus Tetraneuris. In the meantime our very own Aven Nelson, Father of Wyoming Botany, found populations in the Laramie area that were different enough to be be recognized as a new variety. "Its matted habit, silky-lanate leaves and very short scapes [flowering stems] easily separate it." he wrote in 1899. Nelson's 1898 collection from the "Laramie Hills" was the type specimen (basis for description) for the new variety.
From the Rocky Mountain Herbarium, U. Wyoming. Click image to view labels.
Zooming in (below), we see this is a member of the daisy or aster family (Asteraceae). What some would interpret as a single flower is actually many tiny ones: a round cluster of disc flowers surrounded by ray flowers with strap-like united petals.
Nelson provided no common name, so I checked the Integrated Taxonomic Information System, supported and used by many North American governmental agencies. Officially, this is the Caespitose Four-nerve Daisy, a translation of the Latin. But there's gotta be something better! I suggest Nelson's Silky Stemless Daisy :)

Information about taxonomic and nomenclatural history of plant species is available at Tropicos, often with links to historical literature, including the wonderful offerings of the Biodiversity Heritage Library. That's where I found Aven Nelson's 1899 article about the genus Tetraneuris.

This is my rather tangential contribution to news from the tree-followers who gather monthly. More here. Thanks to The Squirrelbasket for continuing to host!


  1. thanks Hollis, for reminding me, i plan to read your post, and! report on my tree tomorrow. I see you had lots to report, i hope i have something.

  2. How about Nelson's little daisy? Do you know the name Nuttal's little rose? That is the name i use when i see Chamaerhodos erecta.

    1. Jozien, Yes, Chamaerhodos erecta grows nearby—called Little Rose, at least by some (never know what to think of these "official" common names). I didn't know about the Nuttall connection. I see in Tropicos that he published one of the varieties (as Sibbaldia).

  3. The Caespitose Four-nerve Daisy is a lovely little plant and as you say probably does deserve a better name!

  4. Interesting post and pictures. xx

  5. I love it when you talk botanical...
    What a fascinating little gem of a plant - and those old herbarium specimens always amaze me with the effort that went into them.
    Wyoming is a stunning land.
    All the best :).

    1. Pat—I'm glad you appreciate the old herbarium specimens. I do also ... in part because I can commune with those who came before :)

  6. Thank you tree-followers for the comments, and for continuing with the group. I would miss it otherwise!
    PS late in responding because I've been traveling