Hmmm is that Silphium trifoliatum, whorled rosin weed, growing in acidic volcanic sand substrate in Wichita short grass prairie. A bit unusual and if so it would be considerably disjunct and also depauperate. If you look you’ll notices wider leaves(really they are about the same width just true S. trifoliatum is conduplicate (taco’d/folded up) where as these are almost recurved(bent down) or flat), the petioles seem off( bit shorter), the stem color is off(green vs red), and the ligules(daisy rays) are wider and shorter than they should be for Silphium trifoliatum, branching capitulescence of Silphium trifoliatum is pretty noticeable(why I think they are showier.) and this one is just forming three forks on lower capitulescence, and the population also seems somewhat clonal too. The real reason for all of this is that this is a var. of a showier(depending on who you ask because I disagree tbh but if its suggested as a helpful thing in keys it may help in the field) species known for inhabiting coastal regions and shortgrass prairies. If anything I agree with the individual capitulum’s being showier.
True Silphium asteriscus var. trifoliatum, growing in the bottomlands near one of many Volcanic lakes, in mixed savannah-scrub habitat.
Whorled Starry Rosinweed.
As a comparison, here is Huffman prairie ecotype of true Silphium trifoliatum, red stemmed, conduplicate, pretty darn branched. less showier capitulum due to size.
