The Collaborative International Dictionary of English v.0.48:

orpine \or"pine\, n. [F. orpin the genus of plants which
   includes orpine; -- so called from the yellow blossoms of a
   common species (Sedum acre). See Orpiment.] (Bot.)
   A low plant with fleshy leaves (Sedum telephium), having
   clusters of purple flowers. It is found on dry, sandy places,
   and on old walls, in England, and has become naturalized in
   America. Called also stonecrop, and live-forever.
   [Written also orpin.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Stonecrop \Stone"crop`\, n. [AS. st[=a]ncropp.]
   1. A sort of tree. [Obs.] --Mortimer.
      [1913 Webster]

   2. (Bot.) Any low succulent plant of the genus Sedum, esp.
      Sedum acre, which is common on bare rocks in Europe, and
      is spreading in parts of America. See Orpine.
      [1913 Webster]

   Virginian stonecrop, or Ditch stonecrop, an American
      plant (Penthorum sedoides).
      [1913 Webster]

WordNet (r) 3.0 (2006):

stonecrop
    n 1: any of various northern temperate plants of the genus Sedum
         having fleshy leaves and red or yellow or white flowers