• The leaf undersides of the bull thistle are light green or whitish green, while the leaf undersides for some native thistles, such as Cirsium discolor (pas- ture thistle) and Cirsium altissimum (tall thistle), are powdery white in appearance. (skymeadows.info)
  • Some of the upper leaves near the flowerheads may be lanceolate or linear, but remain unlobed. (skymeadows.info)