Ericameria nauseosa var. iridis

(L. C. Anderson) G. L. Nesom & G. I. Baird

Phytologia 75: 86. 1993.

Common names: Rainbow Hills rabbitbrush
EndemicConservation concern
Basionym: Chrysothamnus nauseosus subsp. iridis L. C. Anderson Great Basin Naturalist 41: 311. 1981
Synonyms: Chrysothamnus nauseosus var. iridis (L. C. Anderson) S. L. Welsh
Treatment appears in FNA Volume 20. Treatment on page 65. Mentioned on page 63.

Plants 10–20 cm. Stems grayish green (at least when young), leafy, faces ± compactly tomentose. Leaves grayish green; blades 1-nerved, linear, 15–40 × 0.8–1 mm, compactly tomentose. Involucres 12–16 mm. Phyllaries 20–26, apices erect, acute to acuminate, abaxial faces glabrous. Corollas 7.8–8.7 mm, tubes glabrous, lobes 1.5–2 mm, glabrous; style appendages longer than stigmatic portions. Cypselae glabrous; pappi 5.2–5.8 mm. 2n = 18.


Phenology: Flowering late summer.
Habitat: Steep slopes on ± barren, gypsiferous, Arapien shale
Elevation: ca. 2000 m

Discussion

Of conservation concern.

Variety iridis is known only from Sevier County.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
rounded +  and flat-topped +
Lowell E. Urbatsch +, Loran C. Anderson +, Roland P. Roberts +  and Kurt M. Neubig +
(L. C. Anderson) G. L. Nesom & G. I. Baird +
decurrent +
Chrysothamnus nauseosus subsp. iridis +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
filiform;narrowly oblanceolate +
0.8mm;1mm +
rugulose +  and muricate +
tan +  and reddish +
subequal +
Rainbow Hills rabbitbrush +
not 2-lipped +  and actinomorphic +
0.78 cm7.8 mm <br />0.0078 m <br /> (0.87 cm8.7 mm <br />0.0087 m <br />) +
turbinate +  and cylindric or oblanceoloid +
fertile +  and bisexual +
fertile +  and bisexual +
ca. 2000 m +
resinous +
gland-dotted +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Steep slopes on ± barren, gypsiferous, Arapien shale +
thyrsiform +, paniculiform +, branched +, racemiform +, cymiform +, discoid +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.6 cm6 mm <br />0.006 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
obconic;subcylindric +
1.2 cm12 mm <br />0.012 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
sessile +  and petiolate +
grayish green +
erect;spreading or reflexed +
deltate +  and triangular +
raised +  and evident +
2-carpellate +
persistent +
0.52 cm5.2 mm <br />0.0052 m <br /> (0.58 cm5.8 mm <br />0.0058 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering late summer. +
0.15 cm1.5 mm <br />0.0015 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
ovate +  and lanceolate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
Endemic +  and Conservation concern +
resinous +
grayish green +
ascending +  and spreading +
lanceolate +  and subulate +
appendaged +  and truncate +
papillate +  and smooth +
Chrysothamnus nauseosus var. iridis +
Ericameria nauseosa var. iridis +
Ericameria nauseosa +
variety +
campanulate +
perennial +, biennial +  and annual +