39, Tanacetum (Tourn.)L. 
Stout aromatic, very leafy perennial herbs with alternate 1-3 times 
pinnatifid leaves. Heads numerous, hemispherical, arranged in flat-topped 
clusters, radiate, but appearing discoid due to smallness of the ray flowers, 
Involucre cup-shaped, formed of numerous closely overlapping narrow bracts; 
receptacle convex, naked. Ray flowers pistillate, fertile, yellow; disco 
flowers yellow, Achenes sub#prismatic, ribbed; pappus forming a low chaffy 
crown. 
1, T. vulgare Le Tansy. Strong-smelling terb 80-100 cm, tall or more, 
glabrous; leaves mostly twite”pinnatifid, the ultimate segments acute, 
frequently sharply toothed; clusters 10-12 cm, across, the bracts of the 
involucre 2-35 mm, long; flowers yellow, 
- - _ ~ 7 
Escaped from gardens or introduced as ‘a weed in waste places. — 
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mnoY ——> Priest River, Epling 7983. 
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