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See list of 3 species in this genus

Reference: Soltis (2006).

  • 1a. Peduncles slender, not enlarged in flower and scarcely enlarged even in fruit; cypsela body including beak 15–25 mm long; involucre 12–24 mm tall in flower, becoming 19–38 mm tall in fruit; involucral bracts shorter than to equaling the ray flowers in length
  • 1b. Peduncles apically enlarged and fistulous in flower and fruit [Fig. 473]; cypsela body 
25–40 mm long; involucre 25–40 mm tall in flower, becoming 40–70 mm tall in fruit; involucral bracts exceeding ray flowers in length

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