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Key to Chromolaena

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1 Leaf base cuneate; leaf blade lanceolate; petiole 0-1 (-3) mm long; [more widespread in our region, especially along the Gulf Coastal Plain]
1 Leaf base broadly cuneate, rounded, truncate, or subcordate; leaf blades (at least the larger) triangular; petiole 5-20 mm long; [FL peninsula and TX coastal areas].
  2 Leaf blades 1.5-4 cm long, 0.7-2.2 cm wide; involucres 5.5-7.5 (-8) mm tall; perennial herbs, 1.2.5 dm tall
  2 Leaf blades 3-10 cm long, 1-4 cm wide; involucres (7-) 8-10 mm tall; perennial herbs or suffrutescent, 8-25 dm tall