Blue Sky Botany – Thimbleweeds
Blue Sky Botany – Thimbleweeds
Article and photos by Rob Baller
Originally written April 29, 2023
Botanist and early The Prairie Enthusiasts member Rob Baller created this series for our friends at Blue Mounds Area Project. The “blue sky” technique is Rob’s favorite for taking stunning plant photographs. Let him know what you think at robertballer@outlook.com.
ALWAYS get permission from the property owner if you want to try this technique.
Two thimbleweeds (Anemone cylindrica and A. virginiana) reside here in Wisconsin, one trending in the prairie and the other in oak savanna. Both have slender, stiff stems rising from the earth like antennae. Both produce a whorl of highly dissected, pointed, palmate leaves that emerge maybe half-way up the plant. Within this circle of leaves are a few more antennae; these become the stalks that bear a single flower on each antenna, somewhere between knee and waist high. All have 5 to 6 petals, and some people claim they are off-white or pale green or bland yellow. If these two different thimbleweeds accidentally sprout close to each other, as they are wont to do, we get confused, because they look mighty alike. Especially when there are no flowers, but only seed heads. Calm yourself. We’ll handle this.
Prairie thimbleweed (A. cylindrica)
June-July. Knee high. Sunny prairie, on steep and rolling hills and everywhere in between that’s pretty dry. Though I have not seen it in sand; let me know if you have. The seeds of this plant grow tightly compacted in a fuzzy, inch-long vertical cylinder the diameter of a pencil, and that shape helps name and identify this species. The color is usually whitish. The sides of the seed cylinder are parallel.
Tall thimbleweed (A. virginiana)
June-July. They tend to begin flowering a few weeks later than the prairie thimbleweed, but they do overlap. Shin to waist high. In part shade, from mesic to rocky ground, such as steep stony slopes with oak savanna, and on a variety of lightly shaded sites, making it possible to grow within feet of a bona fide prairie thimbleweed but not usually. Flowers are much like the prairie thimbleweed, but I believe more yellowish and a little larger on average even. The wooly seedhead thimble is oval. Its sides are not parallel. And it appears more golden colored.
The best, most reliable feature for distinguishing these two cousins is that prairie thimbleweed has only one whorl of leaves along its elongated flowering stems. Tall thimbleweed has an extra tier of leaflets; first there are the regular leaves, and then, higher up, are another grouping of smaller leaflets.
It is tempting to describe how the leaves and/or leaflets of these species differ in shape and form. I feel they can be too close to call, confusing the innocent. Even my treasured reference book, Wildflowers of Wisconsin by the esteemed Merel Black and Emmet Judziewicz, appears to have a suspect photo of A. cylindrica, its leaf shape not quite right in my view. Perhaps there are regional variations I don’t know about. So, I won’t say anything.
About The Prairie Enthusiasts
The Prairie Enthusiasts is an accredited land trust that seeks to ensure the perpetuation and recovery of prairie, oak savanna, and other fire-dependent ecosystems of the Upper Midwest through protection, management, restoration, and education. In doing so, they strive to work openly and cooperatively with private landowners and other private and public conservation groups. Their management and stewardship centers on high-quality remnants, which contain nearly all the components of endangered prairie communities.











