Detalle con el envés de las hojas inferiores.

Más tomas:

https://www.biodiversidadvirtual.org/herbarium/Cirsium-1-6-img613401.html
https://www.biodiversidadvirtual.org/herbarium/Cirsium-2-6-img613402.html
https://www.biodiversidadvirtual.org/herbarium/Cirsium-3-6-img613403.html
https://www.biodiversidadvirtual.org/herbarium/Cirsium-4-6-img613404.html
https://www.biodiversidadvirtual.org/herbarium/Cirsium-5-6-img613405.html