Burke: Tanacetum vulgare vs. Tanacetum parthenium

	Tanacetum vulgare	Tanacetum parthenium
	common tansy	featherfew, feverfew
Habit	Coarse aromatic perennial from a stout rhizome, glabrous throughout, 4-15 dm. tall.	Highly aromatic, branching perennial, 2-8 dm. tall, covered with fine, white-woolly hairs.
Leaves	Leaves numerous, 1-2 dm. long and nearly half as wide, usually sessile, pinnatifid, with winged rachis, the pinnae again pinnatifid, with broadly winged rachis, the pinnules often again toothed.	Leaves yellow-green, once or twice pinnate, the segments broad.
Flowers	Heads numerous, commonly 20-200, the inflorescence with a broad, rounded top, the disk about 5-10 mm. wide; involucre bracts imbricate, dry, the margins and tips papery; corollas all tubular, 5-toothed, yellow; pappus a minute crown.	Heads in few-flowered umbels at the ends of the branches; disk 10-25 mm. wide; ray flowers white, occasionally wanting, 4-10 mm. long and nearly as wide; disk flowers numerous, yellow.
Fruits	Achenes 5-ribbed, glandular.

	Tanacetum vulgare	Tanacetum parthenium
Flowering time	July-October	June-November
Habitat	Roadsides, fields, shorelines, wastelots, and other disturbed, open areas at low to middle elevations.	Roadsides, fields, wastelots, and other distrubed areas at low elevations.
Distribution	Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast. [WildflowerSearch map] [BONAP county map]	Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to Nevada, east to the Rocky Mountains. [WildflowerSearch map] [BONAP county map]
Origin	Introduced from Europe	Introduced from Europe
Conservation status	Not of concern	Not of concern
Sibling taxa	T. balsamita, T. bipinnatum, T. parthenium	T. balsamita, T. bipinnatum, T. vulgare
Web links	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. 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, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Tanacetum vulgare

Tanacetum parthenium

common tansy

featherfew, feverfew

Habit

Coarse aromatic perennial from a stout rhizome, glabrous throughout, 4-15 dm. tall.

Highly aromatic, branching perennial, 2-8 dm. tall, covered with fine, white-woolly hairs.

Leaves

Leaves numerous, 1-2 dm. long and nearly half as wide, usually sessile, pinnatifid, with winged rachis, the pinnae again pinnatifid, with broadly winged rachis, the pinnules often again toothed.

Leaves yellow-green, once or twice pinnate, the segments broad.

Flowers

Heads numerous, commonly 20-200, the inflorescence with a broad, rounded top, the disk about 5-10 mm. wide;

involucre bracts imbricate, dry, the margins and tips papery;

corollas all tubular, 5-toothed, yellow;

pappus a minute crown.

Heads in few-flowered umbels at the ends of the branches; disk 10-25 mm. wide;

ray flowers white, occasionally wanting, 4-10 mm. long and nearly as wide;

disk flowers numerous, yellow.

Fruits

Achenes 5-ribbed, glandular.