The Collaborative International Dictionary of English v.0.48:

Marsdenia \Mars*de"ni*a\, prop. n. [NL. From W. Marsden, an
   English author.] (Bot.)
   A genus of plants of the Milkweed family, mostly woody
   climbers with fragrant flowers, several species of which
   furnish valuable fiber, and one species (Marsdenia
   tinctoria) affords indigo.
   [1913 Webster] Marseillais