Artemisia laciniata
Artemisia porteri
Siberian wormwood
Porter mugwort, Porter's wormwood
1–3, erect, reddish brown, simple, strigillose to spreading-hairy, or glabrous.
5–8, silver-gray, densely tomentose.
basal (in rosettes, petioles to 12 cm) and cauline, greenish;
blades (basal) 2–3-pinnate, relatively deeply lobed (cauline sessile, 1–2-pinnately lobed to entire), faces sparsely hairy to pilose.
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.
globose, 3–5 × 4–8 mm.
broadly campanulate, 4–5(–7) × 2–3 mm.
pistillate 6–8;
bisexual 20–50;
corollas yellowish or yellow to reddish-tinged, 1–2 mm, hairy (hairs tangled).
pistillate 8–10 (2–2.8 mm); functionally staminate 22–32;
corollas pale yellow, 2.2–4.5 mm, glandular.
(greenish or yellowish) elliptic (margins hyaline, brownish), glabrous or sparsely hairy.
(ovate, margins broadly scarious) densely tomentose.
(10–70, spreading to nodding, peduncles 0 or to 10 mm) in spiciform arrays 2–5 × 0.5–1 or 8–18 × 1–4 cm.
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.
oblong, 0.5–1 mm, glabrous.
(light brown) ellipsoid, flattened (faintly nerved), 1.5–2 mm, sparsely hairy, glabrous or resinous.
Artemisia laciniata
Artemisia porteri
Subspecies 2 (2 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
1. Stems hairy; leaves mostly cauline, blades 5–20 × 1–2 cm, sparsely hairy; arrays of heads 8–18 × 1–4 cm; corollas yellowish, 1–1.5 mm | subsp. laciniata |
1. Stems glabrous; leaves mostly basal, blades of proximalmost 4–8 × 0.5–1 cm, of cauline 1.5–0.8 × 0.2 cm, sericeous; arrays of heads 2–5 × 0.5–1 cm; corollas yellow or reddish-tinged, 1.5–2 mm | subsp. parryi |
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