Jepson eFlora
Key to families | Table of families and genera

Key to Tanacetum

View taxon page for Tanacetum

1. Leaf blade generally 1–2-pinnately lobed, 1° lobes generally 3–5 pairs, oblong to ± ovate, at least abaxial face generally puberulent; ray flowers generally 10–21+; rays white 2–8(12+) mm; pappus 0 or 0.1–0.2+ mm ..... T. parthenium

1' Leaf blade 2–3-pinnately lobed, 1° lobes 4–24+ pairs, linear to ± oblong or elliptic, generally cobwebby to long-soft-hairy, sometimes ± glabrous; ray flowers 0 or 8–30+, rays 1–8+ mm, yellow; pappus 0.1–0.5+ mm

2. Leaf blade generally long-soft-hairy to tomentose, sometimes ± glabrous; heads disciform to ± radiant or ± radiate, (1)5–12(20+) in ± flat-topped cluster; involucre 8–22+ mm diam ..... T. bipinnatum

2' Leaf blade glabrous or sparsely hairy; heads disciform, 20–200 in ± flat-topped cluster; involucre 5–10 mm diam ..... T. vulgare

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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