Artemisia annua
Artemisia biennis
annual wormwood, armoise annuelle, sweet annie, sweet sagewort
armoise bisannuelle, biennial sagewort, biennial wormwood
mostly 1, erect, green, turning to reddish brown with age, simple (smooth or ribbed), glabrous or sparsely hairy.
1, erect, often reddish, simple (finely striate), glabrous.
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.
cauline, green or yellow-green (sessile);
blades broadly lanceolate to ovate, 4–10(–13) × 1.5–4 cm, 1–2-pinnately lobed (ultimate lobes coarsely toothed), faces glabrous.
globose, 1.5–2.5 × 1.5–2.5 mm.
globose, 2–4 × (1.5–)2–4 mm.
pistillate (0–)10–20;
bisexual 18–24;
corollas pale yellow (broadly campanulate), 0.5–1 mm, glabrous.
pistillate 6–25;
bisexual 15–40;
corollas pale yellow, ca. 2 mm, glabrous.
(green) lanceolate, glabrous.
(green) broadly elliptic to obovate, glabrous.
(nodding, peduncles 2–5 mm) in open, (diffusely branched, leafy) arrays 15–30(–40) × 10–20 cm.
(erect, subsessile) in (leafy) paniculiform to spiciform arrays 12–35(–40) × 2–4 cm (lateral branches relatively short).
oblong (flattened), 0.3–0.8 mm, glabrous.
ellipsoid (4–5-nerved), 0.2–0.9 mm, glabrous.
= 18.
= 18.
Artemisia annua
Artemisia biennis
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.)
Artemisia biennis is naturalized and weedy in the eastern portion of its range. It is morphologically similar to A. annua, differing primarily in the coarser leaf lobes and larger heads that are sessile in axils of leaflike bracts. Artemisia biennis is considered native to the northwest United States; it may be introduced in other parts of its range. The type specimen is a horticultural specimen from New Zealand.
(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
- SEINet
- Plants of the World Online
- Encyclopedia of Life
- Wikipedia
- Google Image Search
- Local floras: BC, CA,
OR, WA - Local Web sites: CalFlora, CalPhotos, Flora NW, Go Botany, IL Wildflowers, KS Wildflowers, MD Biodiversity, MI Flora,
MN Wildflowers, 
MO Plants, PNW Herbaria - WildflowerSearch
- iNaturalist (observations)
- USDA Plants Database
- LBJ Wildflower Center
- SEINet
- Plants of the World Online
- Encyclopedia of Life
- Wikipedia
- Google Image Search
