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Guy L. Nesom +
(Torrey & A. Gray) Greene +
Haplopappus tortifolius +
Mojave woody-aster +
Ariz. +, Calif. +, Nev. +  and Utah. +
200–2000 m +
Sandy or gravelly slopes and flats, often over clay, alkaline, barren areas dominated by creosote bush, sagebrush, shadscale +
Flowering Mar–May(–Jun). +
Illustrated +  and Endemic +
Machaeranthera tortifolia +
Xylorhiza tortifolia var. tortifolia +
Xylorhiza tortifolia +
variety +