Hazardia squarrosa var. grindelioides Hazardia squarrosa var. obtusa
Haplopappus squarrosus Haplopappus squarrosus subsp. squarrosus Hazardia squarrosa var. squarrosa Homopappus squarrosus Haplopappus squarrosus var. squarrosus
World Flora Online, accessed June 20, 2024