Artemisia vulgaris
Artemisia pattersonii
armoise vulgaire, common mugwort, common wormwood, felon-herb, green-ginger, lobed wormwood, mugwort
Patterson sagewort, Patterson's wormwood
relatively numerous, erect, brownish to reddish brown, simple proximally, branched distally (angularly ribbed), sparsely hairy or glabrous.
gray-brown, glabrate or finely pubescent.
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, gray-green;
petiolate;
blades (basal) broadly spatulate, 2–4 × 0.5 cm, pinnately lobed (lobes ca. 1.5 mm wide; cauline smaller, 1-pinnately lobed or entire), faces silky-hairy.
ovoid to campanulate, 2–3(–4) mm.
broadly hemispheric, 5–8 × 5–8(–10) mm.
pistillate 7–10;
bisexual (5–)8–20;
corollas yellowish to reddish brown, 1.5–3 mm, glabrous (style branches arched-curved, truncate, ciliate).
pistillate 7–27;
bisexual 32–100;
corollas (yellow tinged with red), 2–3 mm (including exsert anthers), mostly glabrous (embedded in tangled receptacular hairs).
lanceolate, hairy or glabrescent.
gray (margins dark brown to black), villous.
in compact, paniculiform or racemiform arrays (10–)20–30(–40) × (5–)7–15(–20) cm.
borne singly or (2–5, spreading to nodding, pedunculate) in paniculiform or racemiform arrays 1–5 × 0.5–1 cm.
ellipsoid, 0.5–1(–1.2) mm, glabrous, sometimes resinous.
1.5–2 mm, glabrous.
= 18, 36, 40, 54.
= 14.
Artemisia vulgaris
Artemisia pattersonii
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 pattersonii can be distinguished from the closely related A. scopulorum by its heads being borne singly and narrower phyllary margins.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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