Ericameria parryi var. attenuata

(M. E. Jones) G. L. Nesom & G. I. Baird

Phytologia 75: 88. 1993.

Common names: Narrow-bract rabbitbrush
Endemic
Basionym: Bigelowia howardii var. attenuata M. E. Jones Proc. Calif. Acad. Sci., ser. 2, 5: 691. 1895
Synonyms: Chrysothamnus parryi subsp. attenuatus (M. E. Jones) H. M. Hall & Clements
Treatment appears in FNA Volume 20. Treatment on page 73. Mentioned on page 72.

Plants 20–60 cm. Leaves moderately crowded, green; blades 1-nerved, linear, 20–40 × ca. 1 mm, faces glabrous or sparsely hairy, eglandular, somewhat viscid; distalmost shorter than arrays. Heads 5–10 in compact, racemiform arrays. Involucres 11–12.5 mm. Phyllaries 13–22, apices erect, attenuate. Florets 5–7; corollas clear yellow, 10–11 mm, tubes glabrous, throats gradually dilated, lobes 1.5–2 mm. 2n = 18.


Phenology: Flowering late summer–fall.
Habitat: Mountain slopes, dry, stony soils, sagebrush, pinyon-juniper, ponderosa pine, and aspen communities
Elevation: 1700–3000 m

Discussion

S. L. Welsh et al. (1987) noted that characteristics used to distinguish var. howardii from var. attenuata (distalmost leaves overtopping arrays and pale-colored florets) fail as diagnostic features for plants from Utah.

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 +
Lowell E. Urbatsch +, Loran C. Anderson +, Roland P. Roberts +  and Kurt M. Neubig +
(M. E. Jones) G. L. Nesom & G. I. Baird +
decurrent +
Bigelowia howardii var. attenuata +
0.8 cm8 mm <br />0.008 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
linear;spatulate +
rugulose +  and muricate +
tan +  and reddish +
subequal +
Narrow-bract rabbitbrush +
not 2-lipped +  and actinomorphic +
clear yellow +
1 cm10 mm <br />0.01 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
narrowly ellipsoid +  and subturbinate +
fertile +  and bisexual +
fertile +  and bisexual +
Colo. +, N.Mex. +  and Utah. +
1700–3000 m +
gland-dotted;yellowish;greenish;yellowish;greenish;gray +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Mountain slopes, dry, stony soils, sagebrush, pinyon-juniper, ponderosa pine, and aspen communities +
cymiform +  and racemiform +
singly +, grouped +  and cluster +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.9 cm9 mm <br />0.009 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
subcylindric +
1.1 cm11 mm <br />0.011 m <br /> (1.25 cm12.5 mm <br />0.0125 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
sessile +  and petiolate +
erect;spreading or reflexed +
deltate +  and triangular +
2-carpellate +
off-white +  and brown +
persistent +
0.33 cm3.3 mm <br />0.0033 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering late summer–fall. +
herbaceous-tipped +
0.5 cm5 mm <br />0.005 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
ovate +  and lanceolate or elliptic +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
eglandular +  and branched +
resinous +
densely white +  and grayish +
ascending +  and erect +
lanceolate +  and subulate +
appendaged +  and truncate +
papillate +  and smooth +
Chrysothamnus parryi subsp. attenuatus +
Ericameria parryi var. attenuata +
Ericameria parryi +
variety +
perennial +, biennial +  and annual +