Trillium erectum

from WordNet (r) 3.0 (2006)

Trillium erectum
    n 1: trillium of eastern North America having malodorous pink to
         purple flowers and an astringent root used in folk medicine
         especially to ease childbirth [syn: {purple trillium}, {red
         trillium}, {birthroot}, {Trillium erectum}]

from The Collaborative International Dictionary of English v.0.48

Birthroot \Birth"root`\, n. (Bot.)
   An herbaceous plant ({Trillium erectum}), and its astringent
   rootstock, which is said to have medicinal properties.
   [1913 Webster]

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