Artemisia vulgaris
Artemisia rigida
armoise vulgaire, common mugwort, common wormwood, felon-herb, green-ginger, lobed wormwood, mugwort
scabland sagebrush, stiff sagebrush
relatively numerous, erect, brownish to reddish brown, simple proximally, branched distally (angularly ribbed), sparsely hairy or glabrous.
gray (coarse, brittle), hairy (bark gray, exfoliating).
basal (petiolate) and cauline (sessile), uniformly green or bicolor;
blades broadly lanceolate, ovate, or linear, (2–)3–10(–12) × 1.8–8 cm (proximal reduced and entire, distal pinnately dissected, lobes to 20 mm wide), faces pubescent or glabrescent (abaxial) or glabrous (adaxial).
deciduous, silver-gray (rigid);
blades broadly spatulate, 1.5–4 × 0.5–0.7 cm (bases narrow), 3-lobed (lobes 1/2+ blade lengths, ca. 1 mm wide), faces densely hairy.
ovoid to campanulate, 2–3(–4) mm.
narrowly campanulate, 4–5 × 2.5–3.5 mm.
pistillate 7–10;
bisexual (5–)8–20;
corollas yellowish to reddish brown, 1.5–3 mm, glabrous (style branches arched-curved, truncate, ciliate).
4–8;
corollas yellowish red to red, 2–2.8 mm (style branches oblong, truncate, exsert).
lanceolate, hairy or glabrescent.
elliptic (acute to obtuse), densely canescent.
in compact, paniculiform or racemiform arrays (10–)20–30(–40) × (5–)7–15(–20) cm.
borne singly or (in glomerules) in (densely leafy) spiciform or paniculiform arrays 2–20 × 2 cm.
ellipsoid, 0.5–1(–1.2) mm, glabrous, sometimes resinous.
(4–5-ribbed) 1–1.5 mm, glabrous.
= 18, 36, 40, 54.
= 18, 36.
Artemisia vulgaris
Artemisia rigida
Grown as a medicinal plant, most commonly as a vermifuge, Artemisia vulgaris is widely established in eastern North America and is often weedy in disturbed sites. Populational differences in morphologic forms are reflected in size of flowering heads, degree of dissection of leaves, and overall color of plants (from pale to dark green), suggesting multiple introductions that may date back to the first visits by Europeans. It is tempting to recognize the different forms as subspecies and varieties; the array of variation in the field is bewildering. If genetically distinct forms exist in native populations, the differences appear to have been blurred by introgression among the various introductions in North America. A case could be made for recognizing var. kamtschatica in Alaska based on its larger heads and shorter growth form; apparent introgression with populations that extend across Canada confounds that taxonomic segregation.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Artemisia rigida is an important successional species following fires because the plants form new shoots from the underground caudices. This characteristic aligns the species with other ‘sprouters’ in the subgenus, namely A. cana, A. tripartita, and A. arbuscula.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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