Artemisia porteri |
Artemisia borealis |
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Porter mugwort, Porter's wormwood |
boreal wormwood, field sagewort |
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Habit | Perennials or subshrubs, (7–)8–14 cm (cespitose), faintly aromatic. | Perennials, (6–)8–20(–40) cm (cespitose), mildly aromatic; taprooted, caudices branched. | ||||
Stems | 5–8, silver-gray, densely tomentose. |
(1–)2–5, gray-green, tomentose. |
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Leaves | persistent, silver-green, mostly basal; proximalmost blades 3–4 × 1–1.5 cm, 1-pinnately lobed, lobes mostly 2–3 mm wide; blades of flowering stems somewhat reduced, (1–)2–3(–5) × 0.15 cm, mostly entire; apices rounded, faces densely hairy. |
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. |
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Involucres | broadly campanulate, 4–5(–7) × 2–3 mm. |
hemispheric, 3–4 × 3.5–4 mm. |
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Florets | pistillate 8–10 (2–2.8 mm); functionally staminate 22–32; corollas pale yellow, 2.2–4.5 mm, glandular. |
pistillate 8–10; functionally staminate 15–30; corollas (or lobes) yellow-orange or deep red, 2.2–3.5. |
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Phyllaries | (ovate, margins broadly scarious) densely tomentose. |
(obscurely scarious) densely tomentose-villous. |
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Heads | borne singly or (clustered in 2s and 3s on lateral branches; peduncles 0 or to 5 mm) in paniculiform arrays, (2–)4–9 × 1–1.5(–2) cm. |
(proximal sessile, distal pedunculate) in (leafy) spiciform arrays 4–9(–12) × (0.5–)1–5 cm. |
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Cypselae | (light brown) ellipsoid, flattened (faintly nerved), 1.5–2 mm, sparsely hairy, glabrous or resinous. |
oblong-lanceoloid, somewhat compressed, 0.4–1 mm, faintly nerved, glabrous. |
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Artemisia porteri |
Artemisia borealis |
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Phenology | Flowering mid–late summer. | |||||
Habitat | Barren clay and gravelly soils | |||||
Elevation | 1800–2000 m (5900–6600 ft) | |||||
Distribution |
MT; WY |
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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Discussion | Although Cronquist observed that Artemisia porteri may be an autopolyploid derivative of A. pedatifida, morphologic similarities to northerly cespitose taxa suggest a more complex origin. Artemisia porteri is in the Center for Plant Conservation’s National Collection of Endangered Plants. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Subspecies 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 19, p. 509. | FNA vol. 19, p. 505. | ||||
Parent taxa | ||||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | A. campestris subsp. borealis | |||||
Name authority | Cronquist: Madroño 11: 145. (1951) | Pallas: Reise Russ. Reich. 3: 755. (1776) | ||||
Web links |