Jepson eFlora: Key page
Vascular Plants of California
Key to families | Table of families and genera

Key to Tanacetum

View taxon page for Tanacetum

(For a list of species in Tanacetum, use the above link.)

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

1. Leaf  generally 1–2-pinnately lobed, 1°  generally 3–5 pairs,  to ± , at least abaxial face generally ; 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,  to ± oblong or , 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 , sometimes ± glabrous; heads disciform to ± radiant or ± radiate, (1)5–12(20+) in ± flat-topped cluster;  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.) . Jepson eFlora, [accessed on ]

Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on .

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