Crossword clue: an herbaceous plant (trillium erectum), and its astringent rootstock, which is said to have medicinal properties.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
trillium of eastern North America having malodorous pink to purple flowers and an astringent root used in folk medicine