Artemisia arbuscula |
Artemisia stelleriana |
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black sagebrush, dwarf sagebrush, little sagebrush, low sagebrush |
armoise de Steller, beach wormwood, dusty miller, oldwoman, Steller's wormwood |
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Habit | Shrubs, 10–30(–50) cm, aromatic; root-sprouting. | Perennials, (15–)20–60(–70) cm (mat-forming), sometimes faintly aromatic (rhizomes creeping, relatively thin). | ||||||||
Stems | gray-green to brown, glabrate (diffusely branched from bases, brittle). |
1–3, erect or ascending, white, simple (stout), densely tomentose to floccose. |
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Leaves | (vegetative stems) persistent, gray-green; blades broadly to narrowly cuneate, 3–10 × 2–5 mm, lobed (lobes 3, oblong-linear, to 1/3 blade lengths, mostly 1–3 mm wide, flat, obtuse, laterals sometimes 2–3-fid; leaves on flowering stems deciduous, blades narrowly cuneate, deeply 3-lobed), faces densely hairy (not sticky resinous). |
basal and cauline (petiolate), silver-gray; blades oblanceolate, (proximalmost) 3–10 × 1–5 cm, pinnatifid (lobes relatively broad, rounded; distal leaves, on flowering stems, smaller), faces densely tomentose. |
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Involucres | campanulate or globose-ovoid, (1.5–)2–4(–5) × 1.5–4.5 mm. |
broadly campanulate, 5–8 × 6–7 mm. |
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Florets | 4–6(–10); corollas 1.5–2 mm, glabrous. |
pistillate 12–16; bisexual 25–30; corollas yellow (narrow or tubular), 3.2–4 mm (unusually large), glabrous or sparsely hairy (style branches prominent, erect, blunt). |
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Phyllaries | (margins green) ovate (outer) to oblong, pubescent or tomentose. |
broadly lanceolate, tomentose. |
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Heads | usually borne singly, rarely (1–4, erect, mostly sessile, in pedunculate clusters) in spiciform or paniculiform arrays 2–9 × 0.5–2 cm (branches slender). |
(erect or spreading, peduncles 0 or to 3 mm) in dense, paniculiform, racemiform, or spiciform arrays 8–20 × 2–4 cm. |
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Cypselae | (light brown) 0.7–0.8 mm, resinous. |
(dark brown) narrowly oblong-linear (slightly flattened, smooth), 3–4 mm, glabrous. |
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2n | = 18. |
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Artemisia arbuscula |
Artemisia stelleriana |
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Phenology | Flowering early spring–fall. | |||||||||
Habitat | Sandy soils, coastal strand | |||||||||
Elevation | 0–200 m (0–700 ft) | |||||||||
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY
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AK; CT; DE; FL; LA; MA; MD; ME; MI; MN; NC; NH; NJ; NY; OH; PA; RI; VA; VT; WA; WI; WV; NB; NF; NS; ON; PE; QC; SPM; n Europe; e Asia (Japan, Kamchatka)
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Discussion | Subspecies 3 (3 in the flora). Artemisia arbuscula is one of the more perplexing species in the Tridentatae complex. Anatomic and morphologic characteristics suggest multiple hybrid origins for the subspecies. Deciduous leaves of flowering stems in plants that otherwise have persistent leaves suggest a hybrid origin involving plants of the A. tridentata and A. cana lineages. In most instances, populations of A. arbuscula appear to be reproductively stable. The disposition of Artemisia arbuscula subsp. longicaulis Winward & McArthur (with 2n = 54) has not been determined. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Artemisia stelleriana is apparently native along the western tip of the Aleutian islands (D. F. Murray, pers. comm.). It is an attractive ornamental and, in parts of its range in the flora area, it appears to have escaped from cultivation and is naturalized in beach dunes and other sandy habitats. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 19, p. 511. | FNA vol. 19, p. 532. | ||||||||
Parent taxa | Asteraceae > tribe Anthemideae > Artemisia > subg. Tridentatae | Asteraceae > tribe Anthemideae > Artemisia > subg. Artemisia | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | A. tridentata subsp. arbuscula, A. tridentata var. arbuscula, Seriphidium arbusculum | |||||||||
Name authority | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 398. (1841) | Besser: Nouv. Mém. Soc. Imp. Naturalistes Moscou 3: 79, plate 5. (1834) | ||||||||
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