Helianthus petiolaris subsp. fallax Heiser
Family: Asteraceae
prairie sunflower
[Helianthus petiolaris var. fallax (Heiser) B.L. Turner]
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Stems usually ± hispid , rarely ± hir-sute to glabrate. Leaves: abaxial faces sparsely, if at all, gland-dotted. Peduncles usually with leafy bracts subtending heads. Phyllaries 2-3.5 mm wide. Disc corollas: throats gradually narrowed distal to slight, not densely hairy basal bulges. 2n = 34.

Flowering summer-fall. Dry, open areas; 1200-2500 m; Ariz., Colo., Nev., Utah.