The Collaborative International Dictionary of English v.0.48:

Palma Christi \Pal"ma Chris"ti\ [L., palm of Christ.] (Bot.)
   A plant (Ricinus communis) with ornamental peltate and
   palmately cleft foliage, growing as a woody perennial in the
   tropics, and cultivated as an herbaceous annual in temperate
   regions; -- called also castor-oil plant. [Sometimes
   corrupted into palmcrist.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Palmcrist \Palm"crist\, n.
   The palma Christi. (--Jonah iv. 6, margin, and Douay version,
   note.)
   [1913 Webster]