Arum triphyllum

Possibly engraved by W. B. Annin or Annin and Smith from a drawing by Jacob Bigelow(?).Colored engraving of Arum triphyllum or Dragon root (Figure 1) with "Spadix with anthers" (Figure 2), "Spadix with germs" (Figure 3), and "Longitudinal section of the root" (Figure 4)