Euphorbia corollata
Flowering Spurge
New to me this year, grown from seeds from Prairie Moon Nursery https://www.prairiemoon.com/euphorbia-corollata-flowering-spurge-prairie-moon-nursery.html
Long blooming, with visually distinctive, rubbery foliage and a very high degree of drought tolerance. Their blooms attract a wide range of pollinators and their seeds are a food source for quite a few bird species.
Please check out the Prairie Moon listing at the link above for more details.
Photos by Fritzflohrreynolds, Krzysztof Ziarnek, Kenraiz and peganum from Henfield via Wikimedia Commons