The Collaborative International Dictionary of English v.0.48:

Silva \Sil"va\, n.; pl. E. Silvas, L. Silvae. [L., properly,
   a wood, forest.] [Written also sylva.] (Bot.)
   (a) The forest trees of a region or country, considered
       collectively.
   (b) A description or history of the forest trees of a
       country.
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sylva \Syl"va\, n.; pl. Sylvae. [L. sylva, better silva, a
   wood. See Silva.] (Bot.)
   Same as Silva.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sylva
    n 1: the forest trees growing in a country or region [syn:
         silva, sylva]

U.S. Gazetteer Places (2000):

Sylva, NC -- U.S. town in North Carolina
   Population (2000):    2435
   Housing Units (2000): 1283
   Land area (2000):     3.205223 sq. miles (8.301490 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    3.205223 sq. miles (8.301490 sq. km)
   FIPS code:            66500
   Located within:       North Carolina (NC), FIPS 37
   Location:             35.374199 N, 83.217686 W
   ZIP Codes (1990):     28779
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Sylva, NC
    Sylva