What is the meaning of Hound's_tongue?

Any member of the genus Cynoglossum of small-flowered herbs and shrubs of the Old World.

1. In particular, the biennial weed Cynoglossum officinale, which has soft tongue-shaped leaves and an offensive odour, and which bears nutlets covered with barbed or hooked prickles.

   In particular, the biennial weed Cynoglossum officinale, which has soft tongue-shaped leaves and an offensive odour, and which bears nutlets covered with barbed or hooked prickles.

   Source: wiktionary.org