Flora of North America species comparison

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Ericameria cooperi

Ericameria obovata

Cooper's goldenbush

Rydberg's goldenbush
Habit Plants 20–40 cm.
Stems

erect to ascending, green, becoming tan, branched, stipitate-glandular.
Leaves

ascending;

blades obovate to spatulate (flat), 10–30 × 4–12 mm, midnerves evident (1–2 collateral nerves sometimes present, abaxial reticulum of secondary veins often evident), (margins often undulate) apices obtuse, apiculate, faces densely stipitate-glandular;

axillary fascicules usually absent.
Peduncles

1–7 mm (stipitate-glandular).
Involucres

obconic, 6–8 × 4–7 mm.
Ray florets

4–9;

laminae elliptic, 3.5–6 × 1.2–1.8 mm.
Disc florets

9–15;

corollas 6.2–6.8 mm.
Phyllaries

22–28 in 4–6 series, tan, ovate to elliptic, 1–6 × 0.5–1.2 mm, strongly unequal, mostly chartaceous, midnerves evident, (margins narrowly membranous, entire or minutely lacerate) apices acute to acuminate, abaxial faces mostly stipitate-glandular, resinous.
Heads

in cymiform to racemiform arrays (1–3 cm wide).
Cypselae

tan to reddish brown, columnar, 3.5–4.5 mm [ribs unknown], villous;

pappi tan, 4–5.5 mm.
2n

= 36.

Ericameria cooperi

Ericameria obovata
Phenology Flowering late summer–fall.
Habitat Open rocky soils, mostly associated with desert shrub, pinyon-juniper, and lower ponderosa pine
Elevation 1500–3400 m (4900–11200 ft)
Distribution
from FNA
CA; NV; nw Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
UT
[BONAP county map]
Discussion

Varieties 2 (1 in the flora).

Ericameria cooperi var. bajacalifornica (Urbatsch & Wussow) Urbatsch is known only from Mexico (Baja California).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 56. FNA vol. 20, p. 69.
Parent taxa Asteraceae > tribe Astereae > Ericameria Asteraceae > tribe Astereae > Ericameria
Sibling taxa
E. albida, E. arborescens, E. arizonica, E. bloomeri, E. brachylepis, E. cervina, E. compacta, E. crispa, E. cuneata, E. discoidea, E. ericoides, E. fasciculata, E. gilmanii, E. greenei, E. laricifolia, E. lignumviridis, E. linearifolia, E. linearis, E. nana, E. nauseosa, E. obovata, E. ophitidis, E. palmeri, E. paniculata, E. parishii, E. parryi, E. pinifolia, E. resinosa, E. suffruticosa, E. teretifolia, E. watsonii, E. winwardii, E. zionis
E. albida, E. arborescens, E. arizonica, E. bloomeri, E. brachylepis, E. cervina, E. compacta, E. cooperi, E. crispa, E. cuneata, E. discoidea, E. ericoides, E. fasciculata, E. gilmanii, E. greenei, E. laricifolia, E. lignumviridis, E. linearifolia, E. linearis, E. nana, E. nauseosa, E. ophitidis, E. palmeri, E. paniculata, E. parishii, E. parryi, E. pinifolia, E. resinosa, E. suffruticosa, E. teretifolia, E. watsonii, E. winwardii, E. zionis
Subordinate taxa
E. cooperi var. cooperi
Synonyms Bigelowia cooperi, Haplopappus cooperi Macronema obovatum, Haplopappus rydbergii, Haplopappus watsonii var. rydbergii
Name authority (A. Gray) H. M. Hall: Univ. Calif. Publ. Bot. 3: 56. (1907) (Rydberg) G. L. Nesom: Phytologia 68: 152. (1990)
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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