Which plant has a distinctive flower head and bristly appearance?

• A. Yellow Toadflax
• B. Dalmatian Toadflax
• C. Common Teasel
• D. Perennial Pepperweed

Answer: (C)

Key trait being tested is recognizing a plant by its distinctive inflorescence and texture. Common Teasel shows a clearly recognizable, bristly appearance due to its large, cylindrical cone-shaped flower head surrounded by stiff bracts. The head is the standout feature, making the plant easy to identify in the field and setting it apart from others that lack a bristly, cone-like inflorescence. The other plants have different floral structures: toadflax species display bright flowers on slender stems without a bristly head, and perennial pepperweed forms dense clusters of small white flowers along a stalk rather than a bristly flower head. So, the plant with the distinctive bristly flower head is Common Teasel.