The Collaborative International Dictionary of English v.0.48:

Angelica \An*gel"i*ca\, n. [NL. See Angelic.] (Bot.)
   1. An aromatic umbelliferous plant (Archangelica
      officinalis or Angelica archangelica) the leaf stalks
      of which are sometimes candied and used in confectionery,
      and the roots and seeds as an aromatic tonic.
      [1913 Webster]

   2. The candied leaf stalks of angelica.
      [1913 Webster]

   Angelica tree, a thorny North American shrub (Aralia
      spinosa), called also Hercules' club.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Archangel \Arch`an"gel\, n. [L. archangelus, Gr. 'archa`ggelos:
   cf. OF. archangel, F. archange. See Arch-, pref., and
   Angel.]
   1. A chief angel; one high in the celestial hierarchy.
      --Milton.
      [1913 Webster]

   2. (Bot.) A term applied to several different species of
      plants (Angelica archangelica, Lamium album, etc.).
      [1913 Webster]

WordNet (r) 3.0 (2006):

Angelica Archangelica
    n 1: a biennial cultivated herb; its stems are candied and eaten
         and its roots are used medicinally [syn: garden angelica,
         archangel, Angelica Archangelica]