Artemisia campestris subsp. pacifica
Artemisia campestris
northern wormwood, Pacific field wormwood, Pacific sagewort, western sagewort
beach wormwood, field sagewort, field wormwood, northern wormwood, Pacific sagewort, sand wormwood
2–5.
usually 1–5, turning reddish brown, (often ribbed) tomentose or glabrous.
basal rosettes persistent (faces green and glabrous or gray-green and sparsely hairy).
persistent or deciduous, mostly basal;
basal blades 4–12 cm;
cauline gradually reduced, 2–4 × 0.5–1.5 cm, 2–3-pinnately lobed, lobes linear to narrowly oblong, apices acute, faces densely to sparsely white-pubescent.
turbinate, 2–3 × 2(–3) mm.
broadly turbinate, 2.5–3(–5) × 2–3.5(–7) mm.
pistillate 5–20; functionally staminate 12–30;
corollas pale yellow, sparsely hairy or glabrous.
(margins scarious) glabrous or villous-tomentose.
in arrays 10–22 × 1–3(–7) cm.
(pedunculate) in (mostly leafless) paniculiform arrays.
oblong-lanceoloid, somewhat compressed, 0.8–1 mm, faintly nerved, glabrous.
Artemisia campestris subsp. pacifica
Artemisia campestris
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.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Subspecies ca. 7 (3 in the flora).
Artemisia campestris varies; each morphologic form grades into another. The present circumscription is conservative in that only three subspecies are recognized; the subspecies usually can be separated geographically as well as morphologically. Populations in western North America consist primarily of subsp. pacifica; east of the continental divide, plants are assigned to subsp. canadensis in northern latitudes and to subsp. caudata in southern latitudes.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Perennials; stems 2–5; basal rosettes persistent | subsp. pacifica |
1. Biennials; stems 1(–3); basal rosettes not persistent (withering before flowering) | → 2 |
2. Involucres globose, 3–4 × 3.5–5 mm; n of 50°, primarily Canada | subsp. canadensis |
2. Involucres turbinate, 2–3 × 2–3 mm; s of 50°, e from Rocky Mountains to coastal North America | subsp. caudata |
- Local floras:
BC, 
OR, 
WA - Local Web sites:
CalFlora, CalPhotos, 
Flora NW, 
Go Botany, 
IL Wildflowers, 
KS Wildflowers, 
MI Flora, 
MN Wildflowers, 
MO Plants, 
PNW Herbaria 
WildflowerSearch
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USDA Plants Database- LBJ Wildflower Center
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