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boreal wormwood, field sagewort

big sagebrush, snowfield sagebrush, spike sagebrush

Habit Perennials, (6–)8–20(–40) cm (cespitose), mildly aromatic; taprooted, caudices branched. Shrubs, 30–80 cm (widely branched, gray-tomentose), aromatic; root-sprouting.
Stems

(1–)2–5, gray-green, tomentose.

relatively numerous, brown or grayish green.

Leaves

persistent, basal rosettes persistent, gray-green to white;

blades ovate, 2–4 × 0.5–1 cm, 2–3-pinnately or -ternately lobed, lobes linear to narrowly oblong, apices acute, faces moderately to densely sericeous.

± deciduous (by late summer, turning yellow);

blades lanceolate, oblanceolate, or cuneate, 2.5–5.5 × 0.8–1.2+ cm, entire or irregularly 3–6-lobed (lobes to 1/3 blade lengths, 1.5+ mm wide, rounded or acute; leaves of flowering stems usually smaller, entire), faces ± sericeous or tomentose.

Involucres

hemispheric, 3–4 × 3.5–4 mm.

ovoid or lanceoloid, (2.5–)4–6(–7) mm.

Florets

pistillate 8–10; functionally staminate 15–30;

corollas (or lobes) yellow-orange or deep red, 2.2–3.5.

8–18(–27);

corollas 2.5–3.5, glabrous.

Phyllaries

(obscurely scarious) densely tomentose-villous.

lanceolate, sparsely to densely hairy.

Heads

(proximal sessile, distal pedunculate) in (leafy) spiciform arrays 4–9(–12) × (0.5–)1–5 cm.

(erect) in (leafy) paniculiform arrays 8–15(–25) × 0.5–3(–4) cm.

Cypselae

oblong-lanceoloid, somewhat compressed, 0.4–1 mm, faintly nerved, glabrous.

1–1.5 mm, glabrous or resinous.

2n

= 18, 36, 54, 72.

Artemisia borealis

Artemisia spiciformis

Phenology Flowering mid summer–fall.
Habitat Moist open slopes, rocky meadows, streamsides, woodlands, late-lying snowfields
Elevation 2100–3700 m (6900–12100 ft)
Distribution
from FNA
AK; CA; CO; ID; MT; UT; WA; WY; AB; BC; NT; NU; SK; YT; especially at high elevations and northern latitudes; Eurasia
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; CO; ID; NV; OR; UT; WA; WY
[WildflowerSearch map]
Discussion

Subspecies 2 (2 in the flora).

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

Often confused with Artemisia rothrockii, A. spiciformis has been recognized only recently as a widespread, high-elevation sagebrush of late-lying snowfields. Molecular analysis has not yet determined the degree to which this species intergrades with A. cana subsp. viscidula and A. tridentata subsp. vaseyana, the presumed parents of this putative hybrid. Because snow-field sagebrush produces fertile seeds and forms a stable community type, it is treated here as a distinct species.

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

Key
1. Herbage villoso-tomentose, glabrate, or glabrous; corollas (at least lobes) usually yellow-orange, 2.2–3 mm; mountains, w North America
subsp. borealis
1. Herbage white-hoary; corollas (at least lobes) deep red, 3–3.5 mm; w arctic North America
subsp. richardsoniana
Source FNA vol. 19, p. 505. FNA vol. 19, p. 515.
Parent taxa Asteraceae > tribe Anthemideae > Artemisia > subg. Drancunculus Asteraceae > tribe Anthemideae > Artemisia > subg. Tridentatae
Sibling taxa
A. abrotanum, A. absinthium, A. alaskana, A. aleutica, A. annua, A. arbuscula, A. biennis, A. bigelovii, A. californica, A. campestris, 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. 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. stelleriana, A. suksdorfii, A. tilesii, A. tridentata, A. tripartita, A. vulgaris
Subordinate taxa
A. borealis subsp. borealis, A. borealis subsp. richardsoniana
Synonyms A. campestris subsp. borealis A. tridentata subsp. spiciformis, Seriphidium spiciforme
Name authority Pallas: Reise Russ. Reich. 3: 755. (1776) Osterhout: Bull. Torrey Bot. Club 27: 507. (1900)
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