Ericameria nauseosa var. oreophila

(A. Nelson) G. L. Nesom & G. I. Baird

Phytologia 78: 64. 1995.

Common names: Great Basin rabbitbrush
Basionym: Chrysothamnus oreophilus A. Nelson Bot. Gaz. 28: 375. 1900
Synonyms: Chrysothamnus nauseosus var. artus (A. Nelson) Cronquist Chrysothamnus nauseosus subsp. consimilis (Greene) H. M. Hall & Clements Chrysothamnus nauseosus var. consimilis (Greene) H. M. Hall Chrysothamnus oreophilus var. artus A. Nelson Ericameria nauseosa var. arta (A. Nelson) G. L. Nesom & G. I. Baird Ericameria nauseosa subsp. consimilis (Greene) G. L. Nesom & G. I. Baird
Treatment appears in FNA Volume 20. Treatment on page 67. Mentioned on page 62, 63, 64, 66, 68.

Plants 70–250 cm. Stems greenish, usually leafy, compactly tomentose. Leaves yellowish green; blades 1-nerved, filiform to linear, 20–50 × 0.8–1 mm, faces glabrate. Involucres 6.5–10 mm. Phyllaries 11–20, apices erect, acute, glabrous. Corollas 6–9 mm, tubes glabrous, lobes 1.5–2.5 mm, glabrous; style appendages shorter than or equaling stigmatic portions. Cypselae hairy (sometimes glabrous in Idaho populations); pappi 4.2–7.6 mm. 2n = 18 (as Chrysothamnus nauseosus subsp. consimilis).


Phenology: Flowering late summer–fall.
Habitat: Alkaline valleys and plains
Elevation: 1200–3000 m

Distribution

V20-115-distribution-map.gif

Ariz., Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Utah, Wyo., Mexico (Baja California)

Discussion

The names Chrysothamnus nauseosus subsp. consimilis and var. consimilis (Ericameria nauseosa subsp. consimilis) have been used for this taxon; an equivalent combination has not been made at the varietal level in Ericameria. Variety oreophila intergrades with vars. mohavensis and speciosa.

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 +
(A. Nelson) G. L. Nesom & G. I. Baird +
decurrent +
Chrysothamnus oreophilus +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
filiform;linear +
0.8mm;1mm +
rugulose +  and muricate +
tan +  and reddish +
subequal +
Great Basin rabbitbrush +
not 2-lipped +  and actinomorphic +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
turbinate +  and cylindric or oblanceoloid +
fertile +  and bisexual +
fertile +  and bisexual +
Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, N.Mex. +, Oreg. +, Utah +, Wyo. +  and Mexico (Baja California) +
1200–3000 m +
resinous +
gland-dotted +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Alkaline valleys and plains +
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 +
0.65 cm6.5 mm <br />0.0065 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
sessile +  and petiolate +
yellowish green +
erect;spreading or reflexed +
deltate +  and triangular +
raised +  and evident +
2-carpellate +
persistent +
0.42 cm4.2 mm <br />0.0042 m <br /> (0.76 cm7.6 mm <br />0.0076 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering late summer–fall. +
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 +
resinous +
ascending +  and spreading +
lanceolate +  and subulate +
appendaged +  and truncate +
papillate +  and smooth +
Chrysothamnus nauseosus var. artus +, Chrysothamnus nauseosus subsp. consimilis +, Chrysothamnus nauseosus var. consimilis +, Chrysothamnus oreophilus var. artus +, Ericameria nauseosa var. arta +  and Ericameria nauseosa subsp. consimilis +
Ericameria nauseosa var. oreophila +
Ericameria nauseosa +
variety +
campanulate +
perennial +, biennial +  and annual +