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Key to Inula
Asteraceae
Inula
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40955
1 Plant 1-7.5 dm tall; basal leaves lanceolate, 8-20 (-30+) mm wide; involucres 7-15 mm wide; outer phyllaries 4-6 mm long
1 Plant 5-20 dm tall; basal leaves elliptic, 100-200 mm wide; involucres 20-40 mm wide; outer phyllaries 12-25+ mm long