Flora of North America species comparison

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Ericameria nauseosa var. psilocarpa

Ericameria nauseosa var. speciosa
Photo is of parent taxon

smooth-fruit rabbitbrush
Photo is of parent taxon

common rabbit-bush, rubber rabbitbrush, showy common rabbit-brush, showy rabbitbrush
Habit Plants 30–50 cm. Plants 40–200 cm (shorter in some alpine forms).
Stems

yellowish green, leafy, compactly tomentose.

whitish, leafy, loosely tomentose.
Leaves

yellowish green;

blades 1-nerved, narrowly oblanceolate, 30–70 × 1–2 mm, faces glabrate.

dark green to grayish white;

blades 1-nerved, linear to linear-oblanceolate, 30–70 × 0.3–1.5(–2.5) mm, faces usually loosely, rarely compactly, tomentose.
Involucres

8.5–12.2 mm.

7.5–13.5 mm.
Corollas

8.6–9.6 mm, tubes sparsely hairy, lobes 1.3–1.5 mm, glabrous;

style appendages slightly longer than stigmatic portions.

8.7–13 mm, tubes tomentose or glabrous, lobes 1.1–2.1 mm, glabrous;

style appendages longer than stigmatic portions.
Phyllaries

15–18, apices erect, acute or acuminate to cuspidate, abaxial faces glabrous.

12–28, apices erect, acute, abaxial faces tomentose (especially outer), sometimes sparsely.
Cypselae

glabrous;

pappi 6.8–9.1 mm.

densely hairy;

pappi 6–11.3 mm.
2n

= 18.

Ericameria nauseosa var. psilocarpa

Ericameria nauseosa var. speciosa
Phenology Flowering later summer–fall. Flowering late summer–fall.
Habitat Sagebrush and Elymus salinus communities Dry habitats, including juniper-sage, yellow pine, and pinyon communities
Elevation 1900–2300 m (6200–7500 ft) 50–3500 m (200–11500 ft)
Distribution
from FNA
UT
[BONAP county map]
from FNA
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC
[BONAP county map]
Discussion

Of conservation concern.

Variety psilocarpa is apparently restricted to Carbon, Duchesne, Emery, and Wasatch counties in east-central Utah.

L. C. Anderson (1986b) excluded the name Ericameria nauseosa var. glareosa (M. E. Jones) G. L. Nesom & G. I. Baird [as Chrysothamnus nauseosus subsp. glareosus (M. E. Jones) H. M. Hall & Clements], because he had seen no herbarium or field material. Jones’s original description is sketchy; he mentioned its similarity to subsp. leiosperma. S. L. Welsh et al. (1987) noted the uncertain disposition of this taxon. A. Cronquist (1994) recognized C. nauseosus var. glareosus (M. E. Jones) H. M. Hall and placed C. nauseosus var. psilocarpus in synonymy, noting that it was equal to E. nauseosa var. glareosa (M. E. Jones) G. L. Nesom & G. I. Baird. Without more substantial documentation, use of var. psilocarpa is preferred over var. glareosa, which we take to be of uncertain application.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Variety speciosa intergrades with vars. hololeuca and oreophila. Stabilized hybrids with Ericameria discoidea occur in Mono County, California.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 68. FNA vol. 20.
Parent taxa Asteraceae > tribe Astereae > Ericameria > Ericameria nauseosa Asteraceae > tribe Astereae > Ericameria > Ericameria nauseosa
Sibling taxa
E. nauseosa var. arenaria, E. nauseosa var. bernardina, E. nauseosa var. bigelovii, E. nauseosa var. ceruminosa, E. nauseosa var. graveolens, E. nauseosa var. hololeuca, E. nauseosa var. iridis, E. nauseosa var. juncea, E. nauseosa var. latisquamea, E. nauseosa var. leiosperma, E. nauseosa var. mohavensis, E. nauseosa var. nana, E. nauseosa var. nauseosa, E. nauseosa var. nitida, E. nauseosa var. oreophila, E. nauseosa var. salicifolia, E. nauseosa var. speciosa, E. nauseosa var. texensis, E. nauseosa var. turbinata, E. nauseosa var. washoensis
E. nauseosa var. arenaria, E. nauseosa var. bernardina, E. nauseosa var. bigelovii, E. nauseosa var. ceruminosa, E. nauseosa var. graveolens, E. nauseosa var. hololeuca, E. nauseosa var. iridis, E. nauseosa var. juncea, E. nauseosa var. latisquamea, E. nauseosa var. leiosperma, E. nauseosa var. mohavensis, E. nauseosa var. nana, E. nauseosa var. nauseosa, E. nauseosa var. nitida, E. nauseosa var. oreophila, E. nauseosa var. psilocarpa, E. nauseosa var. salicifolia, E. nauseosa var. texensis, E. nauseosa var. turbinata, E. nauseosa var. washoensis
Synonyms Chrysothamnus nauseosus var. psilocarpus, Chrysothamnus nauseosus subsp. psilocarpus Chrysothamnus speciosus, Chrysothamnus nauseosus subsp. albicaulis, Chrysothamnus nauseosus subsp. speciosus
Name authority (S. F. Blake) G. L. Nesom & G. I. Baird: Phytologia 75: 87. (1993) (Nuttall) G. L. Nesom & G. I. Baird: Phytologia 75: 87. (1993)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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