This big species can be found throughout Missouri. The plant is variable in stem and involucre pubescence but despite this, it is still an easy species to ID in the field. The broad rounded phyllaries and undivided styles are good characteristics for proper identification.
Steyermark breaks the species up into two varieties based on stem pubescence. Variety laeve T. & G. has glabrous and glaucous stems and involucres. Variety integrifolium has pubescent stems and involucres. This latter variety is much more common in the state.