Wyethia helianthoides

Nuttall

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

Endemic
Treatment appears in FNA Volume 21. Treatment on page 103. Mentioned on page 100, 101.

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 glanddotted 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.


Phenology: Flowering May–Jul.
Habitat: Meadows, other damp to wet sites, openings in pine forests
Elevation: 40–2600 m

Distribution

V21-244-distribution-map.gif

Idaho, Mont., Nev., Oreg., Wyo.

Discussion

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.

Selected References

None.

Lower Taxa

None.

"broader" is not a number.

... more about "Wyethia helianthoides"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
less corymbiform +  and racemiform +
indeterminate +  and determinate +
William A. Weber +
Nuttall +
bristlelike +
coroniform +
truncate +  and cuneate +
compound +  and simple +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
lance-elliptic;elliptic-ovate +
20 cm200 mm <br />0.2 m <br /> (30 cm300 mm <br />0.3 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
3-4-angled +  and prismatic +
fertile +  and bisexual +
fertile +  and bisexual +
Idaho +, Mont. +, Nev. +, Oreg. +  and Wyo. +
40–2600 m +
glabrate +, glabrous +, sparsely pilose +  and pilosulous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Meadows, other damp to wet sites, openings in pine forests +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
hemispheric +
2.5 cm25 mm <br />0.025 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
less deltate +  and lanceolate +
denticulate +
1.8 cm18 mm <br />0.018 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
2-carpellate +
persistent +
of 1-4+ ovate to subulate , erose to lacerate scales +  and coroniform +
Flowering May–Jul. +
36 +  and 48 +
J. Acad. Nat. Sci. Philadelphia +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
1 +  and 4 +
lacerate +, ovate +  and subulate +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Enceliinae +, Undefined (tribe Undefined) subtribe Engelmanniinae +, Undefined (tribe Undefined) subtribe Spilanthinae +, Undefined (tribe Undefined) subtribe Verbesininae +  and Undefined (tribe Undefined) subtribe Zinniinae +
Wyethia helianthoides +
species +
cylindric +
cylindric +
shorter to longer than campanulate +
toothed +  and entire +
60 cm600 mm <br />0.6 m <br /> (100 cm1,000 mm <br />1 m <br />) +
15 cm150 mm <br />0.15 m <br /> (60 cm600 mm <br />0.6 m <br />) +
40 cm400 mm <br />0.4 m <br /> (80 cm800 mm <br />0.8 m <br />) +