Carduus

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  C. nutans

  1a. Involucres 20–60 mm wide; involucral bract appendages 2–7 mm wide; capitula often nodding; peduncles 2–30 cm long
• See list of 2 species in 1b
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  1b. Involucres 10–25 mm wide; involucral bract appendages 0.5–1 mm wide; capitula erect [Fig. 385]; peduncles up to 4 (–10) cm long
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    C. crispus

    2a. Abaxial leaf blade surface with dimorphic hairs—longer, curling septate hairs on the veins and sparse to dense tomentum across the surface; involucres 12–17 mm tall; disk corollas 11–16 mm long
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    C. acanthoides

    2b. Abaxial leaf blade surface with only curling, septate hairs; involucres 14–20 mm tall; disk corollas 13–20 mm long

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