Artemisia vulgaris
Artemisia pygmaea
armoise vulgaire, common mugwort, common wormwood, felon-herb, green-ginger, lobed wormwood, mugwort
pygmy sage, pygmy sagebrush
relatively numerous, erect, brownish to reddish brown, simple proximally, branched distally (angularly ribbed), sparsely hairy or glabrous.
pale to light brown (stiffly erect, densely clothed with appressed foliage), sparsely tomentose.
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).
persistent (sessile, rigid), bright green;
blades oblong to ovate, 0.3–0.5 × 0.2–0.3 cm, pinnately lobed (nearly to midribs, 1/3+ widths of blades, lobes 3–7, divergent), faces glabrous or sparsely tomentose, resinous.
ovoid to campanulate, 2–3(–4) mm.
narrowly turbinate, 2–3 × 3–4 mm.
pistillate 7–10;
bisexual (5–)8–20;
corollas yellowish to reddish brown, 1.5–3 mm, glabrous (style branches arched-curved, truncate, ciliate).
2–6;
corollas 2.5–3 mm, glandular (style branches flat, erose, exsert).
lanceolate, hairy or glabrescent.
(green) narrowly lanceolate (midribs prominent), glabrous or sparsely tomentose.
in compact, paniculiform or racemiform arrays (10–)20–30(–40) × (5–)7–15(–20) cm.
(sessile, erect) in paniculiform to racemiform arrays (1–)2–3 × 0.5–1 cm.
ellipsoid, 0.5–1(–1.2) mm, glabrous, sometimes resinous.
(prismatic) 0.4–0.5 mm, glabrous, resinous.
= 18, 36, 40, 54.
= 18.
Artemisia vulgaris
Artemisia pygmaea
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 pygmaea is a distinctive, faintly aromatic shrublet, often mistaken for something other than a sagebrush. In early spring its stiff, bright green, deeply pinnatifid leaves are reminiscent of some prickly member of Polemoniaceae. After flowering, its heads and narrow panicles easily identify it as a member of Artemisia; it is unlike other members of the subgenus (which typically have 3-lobed leaves in fascicled lateral shoots). The molecular analysis by L. E. Watson et al. (2002) supported its phylogenetic alignment within subg. Tridentatae.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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