Artemisia borealis |
Artemisia senjavinensis |
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boreal wormwood, field sagewort |
arctic wormwood |
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Habit | Perennials, (6–)8–20(–40) cm (cespitose), mildly aromatic; taprooted, caudices branched. | Perennials, 30–90 cm (densely cespitose), mildly aromatic (caudices branched, woody, taprooted). | ||||
Stems | (1–)2–5, gray-green, tomentose. |
1–9, erect, gray-green, lanate. |
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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. |
mostly basal (in rosettes, cauline 2–5, scattered on flowering stems); blades (basal) broadly oblanceolate, 0.5–0.8 × 0.5–0.7 cm, relatively deeply lobed (lobes 3–5, acute; cauline blades 0.5–1 cm, entire or pinnately lobed, lobes 3–5), faces densely tomentose to sericeous (hairs 1–2 mm). |
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Involucres | hemispheric, 3–4 × 3.5–4 mm. |
turbinate, 3–4 × 3–5 mm. |
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Florets | pistillate 8–10; functionally staminate 15–30; corollas (or lobes) yellow-orange or deep red, 2.2–3.5. |
pistillate 4–5; bisexual 3–4; corollas yellow or tan, 1.5–2, glandular (style branches blunt, not fringed). |
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Phyllaries | (obscurely scarious) densely tomentose-villous. |
lanceolate or ovate, hairy. |
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Heads | (proximal sessile, distal pedunculate) in (leafy) spiciform arrays 4–9(–12) × (0.5–)1–5 cm. |
in corymbiform arrays 0.5–2.5 × 0.5–2.5 cm (subtended by white-sericeous bracts). |
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Cypselae | oblong-lanceoloid, somewhat compressed, 0.4–1 mm, faintly nerved, glabrous. |
(brown) linear-oblong, ca. 2 mm, (apices flat), glabrous. |
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2n | = 36, 54. |
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Artemisia borealis |
Artemisia senjavinensis |
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Phenology | Flowering mid–late summer. | |||||
Habitat | Open calcareous gravelly slopes in tundra or heath, sandy slopes above high tide | |||||
Elevation | 0–600 m (0–2000 ft) | |||||
Distribution |
AK; CA; CO; ID; MT; UT; WA; WY; AB; BC; NT; NU; SK; YT; especially at high elevations and northern latitudes; Eurasia
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AK; e Asia (Russian Far East, Chukotka) |
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Discussion | Subspecies 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Artemisia senjavinensis is known only from western Alaska (Seward Peninsula) and the Chukchi Peninsula of the Russian Far East. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 19, p. 505. | FNA vol. 19, p. 532. | ||||
Parent taxa | Asteraceae > tribe Anthemideae > Artemisia > subg. Drancunculus | Asteraceae > tribe Anthemideae > Artemisia > subg. Artemisia | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | A. campestris subsp. borealis | Ajania senjavinensis, A. androsacea | ||||
Name authority | Pallas: Reise Russ. Reich. 3: 755. (1776) | Besser: Nouv. Mém. Soc. Imp. Naturalistes Moscou 3: 35. (1834) | ||||
Web links |