A spiny plant with large yellow or purple flower heads.
- Scientific Name: Cirsium horridulum
- Other Names: Common Yellow Thistle, Purple Thistle, Bristle Thistle, Horrid Thistle, Bull Thistle, Spiny Thistle
- Plant Height: 3 - 8 feet
- Flower Size: 3 inches
- Flower Color: Purple, Yellow
- Bloom Time: March, April, May, June
- Petal: Other
- Leaf: Alternate, Basal Rosette, Hairy, Spines
- Stem: Hairy
- Environment: Moist, Part Shade, Sun
- Location: Indian Creek Greenway, Shiloh Greenway