Artemisia annua
Artemisia frigida
annual wormwood, armoise annuelle, sweet annie, sweet sagewort
arctic sage, armoise douce, estafiata, fringe sage, fringe sagebrush, pasture sage, prairie sagebrush, prairie sagewort, prairie wormwood
mostly 1, erect, green, turning to reddish brown with age, simple (smooth or ribbed), glabrous or sparsely hairy.
gray-green or brown, glabrescent.
cauline, bright green;
blades triangular to broadly ovate, 2–5(–10) × 2–4 cm, 2–3-pinnatifid (lobes relatively narrow, ± toothed), faces glabrous, gland-dotted.
persistent, silver-gray;
blades ovate, 0.5–1.5(–2.5) cm, 1–2-ternately lobed (lobes 0.2–0.5 mm wide), faces densely whitish-pubescent.
globose, 1.5–2.5 × 1.5–2.5 mm.
globose, (3–)5 × (2–)5–6 mm.
pistillate (0–)10–20;
bisexual 18–24;
corollas pale yellow (broadly campanulate), 0.5–1 mm, glabrous.
pistillate 10–17;
bisexual 20–50;
corollas 1.5–2 mm, glabrous.
(green) lanceolate, glabrous.
gray-green (margins sometimes brownish), densely tomentose.
(nodding, peduncles 2–5 mm) in open, (diffusely branched, leafy) arrays 15–30(–40) × 10–20 cm.
in (leafy) paniculiform arrays 0.5–2(–4) × 4–15(–20) cm.
oblong (flattened), 0.3–0.8 mm, glabrous.
1–1.5 mm, glabrous.
= 18.
= 18.
Artemisia annua
Artemisia frigida
Widely cultivated for aromatic oils, Artemisia annua often persists in gardens, becoming naturalized in moist-temperate areas (especially in eastern United States). Reports of naturalization may be exaggerated (reported for Prince Edward Island, but not established).
The systematic placement of this species appears to align most closely with species of the Eurasian subg. Seriphidium (L. E. Watson et al. 2002). Molecular evidence suggests that the Artemisia annua lineage may be ancestral to woody species in the Old World.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Reports of Artemisia frigida from eastern Canada (Ontario eastward), the eastern United States (e.g., Connecticut, Massachusetts, Michigan, Vermont), and Arkansas and Missouri appear to be from old garden sites where the plants may persist. The similarity of this native species to cultivars from eastern Asia (especially Siberia) has led to a number of reports that are apparently based on other cultivars. As a plant with attractive silver foliage, this species has good potential as a drought-hardy plant for flower gardens in cold climates.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
- Local floras:
BC, 
CA, 
WA - Local Web sites: CalFlora, CalPhotos,
Flora NW, 
Go Botany, 
IL Wildflowers, 
KS Wildflowers, 
LA Plants, 
MD Biodiversity, 
MI Flora, 
PNW Herbaria 
WildflowerSearch
iNaturalist (observations)
USDA Plants Database- LBJ Wildflower Center
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MN Wildflowers
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