Wordnet 3.0
NOUN (1)
1. 
 any of numerous short-stemmed plants of the genus Primula having tufted basal leaves and showy flowers clustered in umbels or heads; 
[syn: primrose, primula]
The Collaborative International Dictionary of English v.0.48:
Primula \Prim"u*la\, n. [LL. See Primrose.] (Bot.)
   The genus of plants including the primrose (Primula vera).
   [1913 Webster]
WordNet (r) 3.0 (2006):
primula
    n 1: any of numerous short-stemmed plants of the genus Primula
         having tufted basal leaves and showy flowers clustered in
         umbels or heads [syn: primrose, primula]