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
.
