The Collaborative International Dictionary of English v.0.48:

Scotch \Scotch\, a. [Cf. Scottish.]
   Of or pertaining to Scotland, its language, or its
   inhabitants; Scottish.
   [1913 Webster]

   Scotch broom (Bot.), the Cytisus scoparius. See Broom.


   Scotch dipper, or Scotch duck (Zool.), the bufflehead; --
      called also Scotch teal, and Scotchman.

   Scotch fiddle, the itch. [Low] --Sir W. Scott.

   Scotch mist, a coarse, dense mist, like fine rain.

   Scotch nightingale (Zool.), the sedge warbler. [Prov. Eng.]


   Scotch pebble. See under pebble.

   Scotch pine (Bot.) See Riga fir.

   Scotch thistle (Bot.), a species of thistle (Onopordon
      acanthium); -- so called from its being the national
      emblem of the Scotch.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sedge \Sedge\, n. [OE. segge, AS. secg; akin to LG. segge; --
   probably named from its bladelike appearance, and akin to L.
   secare to cut, E. saw a cutting instrument; cf. Ir. seisg, W.
   hesg. Cf. Hassock, Saw the instrument.]
   1. (Bot.) Any plant of the genus Carex, perennial,
      endogenous, innutritious herbs, often growing in dense
      tufts in marshy places. They have triangular jointless
      stems, a spiked inflorescence, and long grasslike leaves
      which are usually rough on the margins and midrib. There
      are several hundred species.
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   Note: The name is sometimes given to any other plant of the
         order Cyperaceae, which includes Carex, Cyperus,
         Scirpus, and many other genera of rushlike plants.
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   2. (Zool.) A flock of herons.
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   Sedge hen (Zool.), the clapper rail. See under 5th Rail.


   Sedge warbler (Zool.), a small European singing bird
      (Acrocephalus phragmitis). It often builds its nest
      among reeds; -- called also sedge bird, sedge wren,
      night warbler, and Scotch nightingale.
      [1913 Webster]