Dipsacus

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  D. fullonum

  1a. Stem leaf blades crenate-serrate to entire; involucral bracts linear; corollas light purple (rarely white)
• Choose this species
  D. laciniatus

  1b. Stem leaf blades irregularly laciniate-pinnatifid; involucral bracts narrow-subulate 
 [Fig. 543]; corollas white (rarely light purple)

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