We have several varieties of thistle growing in our area. The main one is Texas Thistle Cirsium texanum (of course 😉 )
The Texas thistle grows 2-5 feet tall, without branches, or sparingly branched near the top. The numerous leaves are alternate, 4-9 inches long, smaller on the upper third of the stem. Leaves are green above and white below, with a woolly texture on the underside. The irregular lobes have spines at the tip but few elsewhere on the leaf. There is 1 flower head to a stem, with no ray flowers but numerous disk flowers, which are deep rose-lavendert.
Bumblebees work the flowers when they mature.