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FNA | Family List | FNA Vol. 21 | Asteraceae | Wyethia

7. Wyethia helianthoides Nuttall, J. Acad. Nat. Sci. Philadelphia. 7: 40, plate 5. 1834.

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.


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