Tanacetum partheniifolium (Willd.) Sch. Bip.

Matricaria praealta (Vent.) Poir. in Lam. Encyc. Suppl. 3: 602 1814.
Chrysanthemum praealliim Vent. Descr. PI. Cels pi. 43. 1801. Pyrethrum parthenifolium Wiild. Sp. PI. 3: 2156. 1804. Chrysanthemum parthenifolium Pers. Syn. PI. 2: 462. 1807.
A perennial herb; stem erect, 3-6 dm. high, slightly pubescent when young, glabrous in age; leaves petioled, 5-15 cm. long, sparingly and finely pilose when young, glabrate in age; blades oval or elliptic in outline, pinnatifid; primary divisions 3-7, oblanceolate in outUne, acute, cleft with oblanceolate lobes; heads several, long-pedimcled ; involucre saucer-shaped, 3 mm. high, 6-8 mm. broad; bracts many, in 2-3 series, straw-colored, he outer slightly shorter, lance-linear, acute, slightly pubescent, with scarious tips; receptacle convex; ray-flowers 20-25; ligules oblong, white, 7-10 mm. long; disk-corollas yellow, 2.5 mm. long; achenes 1.5 mm. long, usually 10-ribbed, glabrous; pappus of a short entire crown.
Typb locality: Garden plant, from Persian seeds.
Distribution: Escaped from cultivation on Vancouver Island; native of Persia, Armenia, and Caucasus.