Source : Webster's Revised Unabridged Dictionary (1913)

Japonica \Ja*pon"i*ca\, n. [NL., Japanese, fr. Japonia Japan.]
   (Bot.)
   A species of Camellia ({Camellia Japonica}), a native of
   Japan, bearing beautiful red or white flowers. Many other
   genera have species of the same name.

Source : WordNet®

japonica
     n 1: greenhouse shrub with glossy green leaves and showy fragrant
          roselike flowers; cultivated in many varieties [syn: {Camellia
          japonica}]
     2: deciduous thorny shrub native to Japan having red blossoms
        [syn: {maule's quince}, {Chaenomeles japonica}]