Flower heads numerous and violet to reddish?

• A. Scotch Thistle
• B. Musk Thistle
• C. Plumeless Thistle
• D. Mediterranean Sage

Answer: (A)

Think about how the flowers appear on the plant. A plant with many flower heads grouped along the flowering stalk and with blossoms in a deep purple to reddish-purple hue points to Scotch Thistle. It produces dense, multiple heads on the upper stems, giving a conspicuous violet-to-reddish display. The other options either don’t show that dense “many heads” look or their blossoms don’t reach that violet-to-reddish color range. Mediterranean Sage has spike-like inflorescences of individual purple flowers rather than numerous thistle heads, and musk or plumeless thistles typically don’t present the same concentrated, dark purple head clusters.