Burke: Tanacetum parthenium vs. Tanacetum vulgare

	Tanacetum parthenium	Tanacetum vulgare
	featherfew, feverfew	common tansy
Habit	Highly aromatic, branching perennial, 2-8 dm. tall, covered with fine, white-woolly hairs.	Coarse aromatic perennial from a stout rhizome, glabrous throughout, 4-15 dm. tall.
Leaves	Leaves yellow-green, once or twice pinnate, the segments broad.	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.
Flowers	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.	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.
Fruits		Achenes 5-ribbed, glandular.

	Tanacetum parthenium	Tanacetum vulgare
Flowering time	June-November	July-October
Habitat	Roadsides, fields, wastelots, and other distrubed areas at low elevations.	Roadsides, fields, shorelines, wastelots, and other disturbed, open areas at low to middle elevations.
Distribution	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]	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]
Origin	Introduced from Europe	Introduced from Europe
Conservation status	Not of concern	Not of concern
Sibling taxa	T. balsamita, T. bipinnatum, T. vulgare	T. balsamita, T. bipinnatum, T. parthenium
Web links	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	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

Tanacetum parthenium

Tanacetum vulgare

featherfew, feverfew

common tansy

Habit

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

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

Leaves

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

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.

Flowers

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.

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.

Fruits

Achenes 5-ribbed, glandular.