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See list of 2 species in this genus
  • 1a. Plants annual, 2–10 dm tall; stems without decurrent wing-angles; capitula with 10–15 carpellate ray flowers; leaf blades coarsely serrate
  • 1b. Plants perennial, 10–30 dm tall; stems with prominent wing-angles that are decurrent from the leaf bases; capitula with 2–10 sterile ray flowers; leaf blades serrate to subentire

 Show photos of:   Each photo represents one species in this genus.