Tanacetum vulgare L.

Tanacetum vulgare L. Sp. PI. 844. 1753
Tanacetum vulgare crispum L. Sp. PI. 845. 1753.
Tanacetum officinarum Crantz. Inst. 1: 273. 1766.
Tanacetum elatum Salisb. Prodr. 190. 1796.
Tanacetum crispum Steud. Nom. Bot. Phan. 825. 1821.
Pyrethrum vulgare Boiss. Fl. Orient. 3: 352. 1875.
C/jo'san//iemK?« ranoce/Hm Baillon, Hist. PI. 8: 311. 1882. Not C. Tano«/am Vis. 1847. A stout perennial, with a rootstock; stem 4-10 dm. high, often reddish, simple, roundangled, more or less puberulent; leaves 1-3 dm. long, twice pinnately divided, glandularpunctate and more or less puberulent; primary divisions 2-5 cm. long, linear, acute or in var. crispum oblong and obtuse, more or less decurrent on the more or less winged and lobed rachis, the upper confluent; secondary diisions lanceolate or oblong-lanceolate, acute or in the variety obovate and obtuse, sharply serrate; heads many, in compound corymbs; involucre hemispheric, about 4 mm. high, 6-S mm. broad; bracts 30-40, in 2-3 series, sparingly puberulent or glabrate, the outer lanceolate, acute, the inner oblong and obtuse; ray-flowers in a single series; corollas tubular, flattened, split on one side, 3-lobed, glabrous, 2 mm. long; disk-flowers 200-400; corollas 2 mm. long, glabrous; achenes 3-5-angled,l mm. long; pappusasmall 3-5-toothed crown.
Type LOCALirv: Europe.
Distribution: Introduced and naturalized, Nova Scotia to South Carolina, Mississippi, California, and Washington; Bermudas; native of Europe and Asia.