Plants 25-40(-80) cm. Basal leaves: blades (light green) lance-elliptic to elliptic-ovate, (10-)20-30+ cm, margins usually entire, sometimes denticulate, ± ciliolate, faces sparsely pilose to pilosulous (usually minutely gland-dotted or stipitate-glandular as well); cauline leaves similar, smaller distally (petiolate or sessile). Heads borne singly. Involucres ± hemispheric, (12-)20-30(-40) mm diam. Phyllaries 36-48, subequal, herbaceous, margins villous-ciliate, faces glabrous or glabrate; outer 18-25 mm (not surpassing discs). Ray florets 13-25; laminae (cream to white) 25-45 mm. Cypselae 9-11 mm, strigillose distally and on margins.

Flowering May-Jul. Meadows, other damp to wet sites, openings in pine forests; 40-2600 m; Idaho, Mont., Nev., Oreg., Wyo.

Hybrids between Wyethia helianthoides and W. amplexicaulis are infrequent where the species are in contact; no introgression has been noted. The hybrids have been called Wyethia ×cusickii Piper; they usually bloom later than W. helianthoides and earlier than W. amplexicaulis.