Burke: Artemisia annua vs. Artemisia frigida

	Artemisia annua	Artemisia frigida
	sweet Annie, sweet sagewort, annual wormwood	prairie sagebrush, prairie sagewort
Habit	Sweet-scented, glabrous, tap-rooted annual 0.3-3 m. tall.	Fragrant, mat-forming perennial from a short, woody crown, 1-4 dm. tall, the stem covered with white or tawny woolly hairs.
Leaves	Leaves 2-10 cm. long, twice or thrice pinnatifid, the ultimate segments linear or lanceolate.	Leaves small and numerous, clustered at the base and well-distributed along the stem, covered with silky-wooly hairs, short-petiolate, the blade 5-12 mm. long, 2-3 times ternately divided into linear-filiform divisions up to 1 mm. wide, with a pair of trifid, stipule-like divisions at the base.
Flowers	Inflorescence broad and open, the discoid heads loose, often nodding, borne on short peduncles; involucre glabrous, imbricate, 1-2 mm. high; flowers all fertile, the outer pistillate; pappus none,	Inflorescence a narrow panicle; involucre 2-3 mm. high, loosely white-woolly; corollas all tubular, yellowish, fertile, the outer ones pistillate, the inner perfect; receptacle covered with numerous long hairs between the flowers; pappus none.
Fruits	Achene glabrous.	Achenes glabrous.

	Artemisia annua	Artemisia frigida
Flowering time	August-October	July-September
Habitat	Roadsides, fields, ditches, wastelots, and other disturbed open places.	Dry, open sagebrush plains and foothills.
Distribution	Occurring in scattered locations east of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California, east across most of North America to the Atlantic Coast. [WildflowerSearch map] [BONAP county map]	Occurring east of the Cascades crest in Washington; Alaska to Washington, east to the Great Plains, Great Lakes region, and northeastern North America. [WildflowerSearch map] [BONAP county map]
Origin	Introduced from Eurasia	Native
Conservation status	Not of concern	Not of concern
Sibling taxa	A. absinthium, A. arbuscula, A. biennis, A. campestris, A. cana, A. douglasiana, A. dracunculus, A. frigida, A. furcata, A. ludoviciana, A. michauxiana, A. norvegica, A. rigida, A. spiciformis, A. stelleriana, A. suksdorfii, A. tilesii, A. tridentata, A. tripartita, A. vulgaris	A. absinthium, A. annua, A. arbuscula, A. biennis, A. campestris, A. cana, A. douglasiana, A. dracunculus, A. furcata, A. ludoviciana, A. michauxiana, A. norvegica, A. rigida, A. spiciformis, A. stelleriana, A. suksdorfii, A. tilesii, A. tridentata, A. tripartita, A. vulgaris
Web links	Local floras: BC, CA, WA Local Web sites: CalFlora, CalPhotos, Flora NW, 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, WA Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Artemisia frigida

sweet Annie, sweet sagewort, annual wormwood

prairie sagebrush, prairie sagewort

Habit

Sweet-scented, glabrous, tap-rooted annual 0.3-3 m. tall.

Fragrant, mat-forming perennial from a short, woody crown, 1-4 dm. tall, the stem covered with white or tawny woolly hairs.

Leaves

Leaves 2-10 cm. long, twice or thrice pinnatifid, the ultimate segments linear or lanceolate.

Leaves small and numerous, clustered at the base and well-distributed along the stem, covered with silky-wooly hairs, short-petiolate, the blade 5-12 mm. long, 2-3 times ternately divided into linear-filiform divisions up to 1 mm. wide, with a pair of trifid, stipule-like divisions at the base.

Flowers

Inflorescence broad and open, the discoid heads loose, often nodding, borne on short peduncles;

involucre glabrous, imbricate, 1-2 mm. high;

flowers all fertile, the outer pistillate;

pappus none,

Inflorescence a narrow panicle;

involucre 2-3 mm. high, loosely white-woolly;

corollas all tubular, yellowish, fertile, the outer ones pistillate, the inner perfect;

receptacle covered with numerous long hairs between the flowers;

pappus none.

Fruits

Achene glabrous.

Achenes glabrous.

Artemisia annua

Artemisia frigida

Flowering time

August-October

July-September

Habitat

Roadsides, fields, ditches, wastelots, and other disturbed open places.

Dry, open sagebrush plains and foothills.

Distribution

Occurring in scattered locations east of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California, east across most of North America to the Atlantic Coast.

[WildflowerSearch map]

[BONAP county map]

Occurring east of the Cascades crest in Washington; Alaska to Washington, east to the Great Plains, Great Lakes region, and northeastern North America.

[WildflowerSearch map]

[BONAP county map]

Origin

Introduced from Eurasia

Native

Conservation status

Not of concern

Sibling taxa