Sentence:  <WSD>Thalias</WSD> are herbaceous perennials with long-stalked, calathea- or canna-like, all-basal leaves, the stalks of which enfold each other toward their bases to produce false stems. 
Meaning of the word marked with <WSD> tags:  Any of the genus "Thalia" of tropical plants found in aquatic or marshy habitats.