Feverfew - Tanacetum parthenium
Rhizomatous or taprooted. Stems erect, 25–80 cm. Herbage puberulent. Leaf blades 1–10 cm long, pinnately divided; segments oblanceolate, deeply serrate. Involucre 5–7 mm across; phyllaries in 2 or 3 series. Ray flowers female, white; ligules 2–8 mm long. Disk corollas ca. 2 mm long. Achenes 1–2 mm long, 5- to 10-angled (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX
The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus bifarius
, Bombus rufocinctus
, Bombus ternarius
, Bombus occidentalis
, and Bombus flavidus
(Thorp et al. 1983, Colla and Dumesh 2010, Koch et al. 2012).