Jepson eFlora
Key to families | Table of families and genera

Key to Tanacetum

View taxon page for Tanacetum

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

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


Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, [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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