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Yellow thistle is endangered in Connecticut. Typically, the flowers are dull yellow, though flower color varies. The upright, spiny leaves that surround the flowerhead make a good identifier.

• Family: Aster (Asteraceae)
• Habitat: near the coast in sandy fields or at the edge of salt marshes
• Height: 1-3 feet
• Flower size: flowerheads 3 inches across
• Flower color: dull yellow, or, rarely, purple or white
• Flowering time: June to July
• Origin: native