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Key to Tanacetum
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40633
1 Leaves 1-3-pinnatifid. | |
2 Rays present, white (T. parthenium) or pink-red colored; leaf blades 4-10 cm long, 1-2-pinnate (with 3-5 pairs of primary lobes) | |
2 Rays absent (rarely present and very small, and then yellow); leaf blades 8-20 cm long, 2-3-pinnate (with 4-20+ pairs of primary lobes) |