What is "acanthus mollis"

Bear's-breech \Bear's"-breech`\, bear's-breeches \bear's"-breech`es\, n.

1. (Bot.) The English cow parsnip ( Heracleum sphondylium)
   --Dr. Prior.

2. a widely cultivated southern European acanthus ( Acanthus mollis) with whitish purple-veined flowers. See Acanthus, n., 1.

   Syn: bear's breech, bear's-breech, bear's breeches, sea holly.

Acanthus mollis, commonly known as bear's breeches, sea dock, bearsfoot or oyster plant, is a herbaceous perennial plant with an underground rhizome in the genus Acanthus. It is regarded as an invasive species in some jurisdictions.