There are many names for this introduced species and several ways of writing the most common English name: hound'stongue, hound's-tongue, hound's tongue.... At any rate, it is considered a serious invasive in some areas, especially out in Alberta, much less so here (though as with any exotic species, this can change). It is on this plant that I normally find the caterpillars of the native moth, confused haploa, a striking brown and white, triangular shaped moth.