Artemisia annua

Linnaeus

Sp. Pl. 2: 847. 1753.

Common names: Sweet Annie sweet sagewort armoise annuelle
Introduced
Synonyms: Artemisia chamomilla C. Winkler
Treatment appears in FNA Volume 19. Treatment on page 523. Mentioned on page 503, 521.

Annuals, 30–200 (–300) cm, sweetly aromatic. Stems mostly 1, erect, green, turning to reddish-brown with age, simple (smooth or ribbed), glabrous or sparsely hairy. Leaves 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. Heads (nodding, peduncles 2–5 mm) in open, (diffusely branched, leafy) arrays 15–30 (–40) × 10–20 cm. Involucres globose, 1.5–2.5 × 1.5–2.5 mm. Phyllaries (green) lanceolate, glabrous. Florets: pistillate (0–) 10–20; bisexual 18–24; corollas pale-yellow (broadly campanulate), 0.5–1 mm, glabrous. Cypselae oblong (flattened), 0.3–0.8 mm, glabrous. 2n = 18.


Phenology: Flowering late summer–fall.
Habitat: Moist waste areas, sandy soils
Elevation: 0–2000 m

Distribution

V19-893-distribution-map.gif

Introduced; N.B., Ont., Que., Ala., Ariz., Ark., Calif., Colo., Conn., Del., D.C., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Miss., Mont., Nebr., N.H., N.J., N.Y., N.C., Ohio, Okla., Oreg., Pa., Tenn., Tex., Vt., Va., Wash., W.Va., Wis., Wyo., Eurasia

Discussion

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.

Selected References

None.

Lower Taxa

None.
... more about "Artemisia annua"
reddish-brown +
not tailed +  and obtuse +
scarious +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Leila M. Shultz +
Linnaeus +
decurrent +
compound +  and simple +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
2-3-pinnatifid;triangular;broadly ovate +
2cm;4cm +
fertile +  and bisexual +
Sweet Annie +, sweet sagewort +  and armoise annuelle +
zygomorphic +, actinomorphic +  and (3-)5-merous +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
winged +  and monomorphic +
fertile +  and bisexual +
fertile +  and bisexual +
N.B. +, Ont. +, Que. +, Ala. +, Ariz. +, Ark. +, Calif. +, Colo. +, Conn. +, Del. +, D.C. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Miss. +, Mont. +, Nebr. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Oreg. +, Pa. +, Tenn. +, Tex. +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +, Wyo. +  and Eurasia +
0–2000 m +
gland-dotted +
peripheral +
winged +  and beaked +
dispersed +
Moist waste areas, sandy soils +
spiciform +  and racemiform +
in subcapitate clusters +  and singly +
30 cm300 mm <br />0.3 m <br /> (40 cm400 mm <br />0.4 m <br />) +
indeterminate +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
heterogamous +  and homogamous +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
each +  and sessile +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
sessile +  and petiolate +
bright green +
persistent +  and deciduous +
deltate +
entire +  and dentate +
2-carpellate +
persistent +
Flowering late summer–fall. +
2 +  and 20 +
styliferous +, neuter +  and pistillate +
sterile +  and fertile +
conic;convex;conic;convex;flat +
2 +  and 5 +
exalbuminous +
Introduced +
wand-like +
appendaged +  and truncate +
papillate +
Artemisia chamomilla +
Artemisia annua +
Artemisia subg. Artemisia +
species +
funnel +  and subglobose +
cylindric +
fibrous-rooted +  and taprooted +
200 cm2,000 mm <br />2 m <br /> (300 cm3,000 mm <br />3 m <br />) +
30 cm300 mm <br />0.3 m <br /> (200 cm2,000 mm <br />2 m <br />) +
shrub +  and subshrub +