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beach wormwood, field sagewort, field wormwood, northern wormwood, Pacific sagewort, sand wormwood

Carruth wormwood, Carruth's sagebrush, Carruth's sagewort, Carruth's wormwood

Habit Biennials or perennials, (10–)30–80(–150) cm, faintly aromatic; taprooted, caudices branched. Perennials, 15–40(–70) cm, faintly aromatic (rhizomatous).
Stems

usually 1–5, turning reddish brown, (often ribbed) tomentose or glabrous.

mostly 3–8, ascending, brown to gray-green, simple (bases curved, somewhat woody), sparsely to densely tomentose.

Leaves

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.

cauline, bicolor (± gray-green);

blades narrowly elliptic, 0.1–2.5(–3) × 0.5–1 cm (gradually smaller distally), relatively deeply pinnatifid (lobes 3–5), faces densely tomentose (abaxial) to sparsely hairy (adaxial).

Involucres

broadly turbinate, 2.5–3(–5) × 2–3.5(–7) mm.

campanulate, 2–2.5(–3) × 1.5–3 mm.

Florets

pistillate 5–20; functionally staminate 12–30;

corollas pale yellow, sparsely hairy or glabrous.

pistillate 1–5;

bisexual 7–25;

corollas pale yellow, 1–2 mm, glandular-pubescent.

Phyllaries

(margins scarious) glabrous or villous-tomentose.

lanceolate, gray-tomentose.

Heads

(pedunculate) in (mostly leafless) paniculiform arrays.

(usually nodding) in (leafy) paniculiform arrays 10–30 × 3–9 cm (branches erect).

Cypselae

oblong-lanceoloid, somewhat compressed, 0.8–1 mm, faintly nerved, glabrous.

(light brown) cylindro-elliptic, ca. 0.5 mm, (curved at summits, scarcely nerved), glabrous (shining).

2n

= 18.

Artemisia campestris

Artemisia carruthii

Phenology Flowering mid summer–early fall.
Habitat Open sites, usually sandy soils, wooded areas, grasslands, railroads
Elevation 600–2900 m (2000–9500 ft)
Distribution
from FNA
AK; AR; AZ; CA; CO; CT; FL; IA; ID; IL; IN; KS; MA; ME; MI; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; SD; TX; UT; VT; WA; WI; WY; AB; BC; MB; NB; NU; ON; QC; SK; especially mountains and high latitudes; Eurasia
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CO; KS; MI; MO; NM; OK; TX; UT; Mexico (Chihuahua, Sonora)
[WildflowerSearch map]
[BONAP county map]
Discussion

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.)

Artemisia carruthii is closely related to members of the A. ludoviciana complex, with which it may intergrade.

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

Key
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
Source FNA vol. 19, p. 506. FNA vol. 19, p. 524.
Parent taxa Asteraceae > tribe Anthemideae > Artemisia > subg. Drancunculus Asteraceae > tribe Anthemideae > Artemisia > subg. Artemisia
Sibling taxa
A. abrotanum, A. absinthium, A. alaskana, A. aleutica, A. annua, A. arbuscula, A. biennis, A. bigelovii, A. borealis, A. californica, A. cana, A. carruthii, A. douglasiana, A. dracunculus, A. filifolia, A. franserioides, A. frigida, A. furcata, A. globularia, A. glomerata, A. laciniata, A. longifolia, A. ludoviciana, A. michauxiana, A. nesiotica, A. norvegica, A. nova, A. packardiae, A. palmeri, A. papposa, A. pattersonii, A. pedatifida, A. pontica, A. porteri, A. pycnocephala, A. pygmaea, A. rigida, A. rothrockii, A. rupestris, A. scopulorum, A. senjavinensis, A. serrata, A. spiciformis, A. stelleriana, A. suksdorfii, A. tilesii, A. tridentata, A. tripartita, A. vulgaris
A. abrotanum, A. absinthium, A. alaskana, A. aleutica, A. annua, A. arbuscula, A. biennis, A. bigelovii, A. borealis, A. californica, A. campestris, A. cana, A. douglasiana, A. dracunculus, A. filifolia, A. franserioides, A. frigida, A. furcata, A. globularia, A. glomerata, A. laciniata, A. longifolia, A. ludoviciana, A. michauxiana, A. nesiotica, A. norvegica, A. nova, A. packardiae, A. palmeri, A. papposa, A. pattersonii, A. pedatifida, A. pontica, A. porteri, A. pycnocephala, A. pygmaea, A. rigida, A. rothrockii, A. rupestris, A. scopulorum, A. senjavinensis, A. serrata, A. spiciformis, A. stelleriana, A. suksdorfii, A. tilesii, A. tridentata, A. tripartita, A. vulgaris
Subordinate taxa
A. campestris subsp. canadensis, A. campestris subsp. caudata, A. campestris subsp. pacifica
Synonyms A. bakeri, A. coloradensis, A. kansana, A. vulgaris subsp. wrightii, A. wrightii
Name authority Linnaeus: Sp. Pl. 2: 846. (1753) Alph. Wood ex Carruth: Trans. Kansas Acad. Sci. 5: 51. (1877)
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