Artemisia campestris subsp. pacifica

(Nuttall) H. M. Hall & Clements

Publ. Carnegie Inst. Wash. 326: 122. 1923.

Common names: Western sagewort
Endemic
Basionym: Artemisia pacifica Nuttall Trans. Amer. Philos. Soc., n. s. 7: 401. 1841
Synonyms: Artemisia campestris var. petiolata S. L. Welsh Artemisia campestris var. scouleriana (Besser) Cronquist Artemisia desertorum var. scouleriana Besser Oligosporus campestris subsp. pacificus (Nuttall) W. A. Weber Oligosporus pacificus
Treatment appears in FNA Volume 19. Treatment on page 508. Mentioned on page 506.

Perennials, 30–100 cm. Stems 2–5. Leaves: basal rosettes persistent (faces green and glabrous or gray-green and sparsely hairy). Heads in arrays 10–22 × 1–3 (–7) cm. Involucres turbinate, 2–3 × 2 (–3) mm.


Phenology: Flowering mid–late summer.
Habitat: Sandy soils, arid regions
Elevation: 100–2500 m

Distribution

V19-855-distribution-map.gif

Alta., B.C., Man., Sask., Alaska, Ariz., Calif., Colo., Idaho, Mont., Nebr., Nev., N.Mex., Oreg., Tex., Utah, Wash., Wyo.

Discussion

Throughout western North America, members of the Artemisia campestris complex can be assigned to subsp. pacifica. Although morphologically distinct through much of its range, subsp. pacifica may intergrade with subsp. canadensis and A. borealis in areas where their ranges overlap.

Selected References

None.

Lower Taxa

None.
not tailed +  and obtuse +
scarious +
paniculiform +
indeterminate +  and determinate +
Leila M. Shultz +
(Nuttall) H. M. Hall & Clements +
4 cm40 mm <br />0.04 m <br /> (12 cm120 mm <br />0.12 m <br />) +
decurrent +
Artemisia pacifica +
compound +  and simple +
entire;toothed;3-lobed;entire;toothed;3-lobed;lobed;spatulate;flabellate;spatulate;flabellate;cuneate;obovate;oblanceolate;oblong;elliptic;ovate;lanceolate;linear;filiform +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Western sagewort +
zygomorphic +, actinomorphic +  and (3-)5-merous +
glabrous +  and hairy +
compressed +  and oblong-lanceoloid +
fertile +  and bisexual +
fertile +  and bisexual +
Alta. +, B.C. +, Man. +, Sask. +, Alaska +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nebr. +, Nev. +, N.Mex. +, Oreg. +, Tex. +, Utah +, Wash. +  and Wyo. +
100–2500 m +
gland-dotted +
white-pubescent +
staminate +  and pistillate +
winged +  and beaked +
dispersed +
Sandy soils, arid regions +
spiciform +  and racemiform +
in subcapitate clusters +  and singly +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
indeterminate +
10 cm100 mm <br />0.1 m <br /> (22 cm220 mm <br />0.22 m <br />) +
heterogamous +  and homogamous +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
2 cm20 mm <br />0.02 m <br /> (?) +
sessile +  and petiolate +
deciduous +  and persistent +
linear +  and narrowly oblong +
entire +  and dentate +
2-carpellate +
persistent +
Flowering mid–late summer. +
villous-tomentose +  and glabrous +
2 +  and 20 +
Publ. Carnegie Inst. Wash. +
styliferous +, neuter +  and pistillate +
sterile +  and fertile +
conic;convex;conic;convex;flat +
2 +  and 5 +
exalbuminous +
reddish-brown +
2 +  and 5 +
wand-like +
appendaged +  and truncate +
papillate +
Artemisia campestris var. petiolata +, Artemisia campestris var. scouleriana +, Artemisia desertorum var. scouleriana +, Oligosporus campestris subsp. pacificus +  and Oligosporus pacificus +
Artemisia campestris subsp. pacifica +
Artemisia campestris +
subspecies +
funnel +  and subglobose +
cylindric +
80 cm800 mm <br />0.8 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
30 cm300 mm <br />0.3 m <br /> (100 cm1,000 mm <br />1 m <br />) +
taprooted +  and fibrous-rooted +