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Guy L. Nesom +
(Rydberg) E. B. Smith +
Isopappus validus +
Ark. +, Kans. +, Okla. +  and Tex. +
20–400 m +
Sand, sandy gravel, dunes, stream terraces, sandstone outcrops, often in areas of oak woodlands, roadsides, roadbanks +
Flowering (Jun–)Jul–Oct. +
Haplopappus validus +
Croptilon hookerianum var. validum +
Croptilon hookerianum +
variety +