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:

Scoparin \Sco"pa*rin\, n. (Chem.)
   A yellow gelatinous or crystalline substance found in broom
   (Cytisus scoparius) accompanying sparteine.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sparteine \Spar"te*ine\, n. (Chem.)
   A narcotic alkaloid extracted from the tops of the common
   broom (Cytisus scoparius, formerly Spartium scoparium),
   as a colorless oily liquid of aniline-like odor and very
   bitter taste.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Broom \Broom\ (br[=oo]m), n. [OE. brom, brome, AS. br[=o]m; akin
   to LG. bram, D. brem, OHG. br[=a]mo broom, thorn?bush, G.
   brombeere blackberry. Cf. Bramble, n.]
   1. (Bot.) A plant having twigs suitable for making brooms to
      sweep with when bound together; esp., the Cytisus
      scoparius of Western Europe, which is a low shrub with
      long, straight, green, angular branches, minute leaves,
      and large yellow flowers.
      [1913 Webster]

            No gypsy cowered o'er fires of furze and broom.
                                                  --Wordsworth.
      [1913 Webster]

   2. An implement for sweeping floors, etc., commonly made of
      the panicles or tops of broom corn, bound together or
      attached to a long wooden handle; -- so called because
      originally made of the twigs of the broom.
      [1913 Webster]

   Butcher's broom, a plant (Ruscus aculeatus) of the Smilax
      family, used by butchers for brooms to sweep their blocks;
      -- called also knee holly. See Cladophyll.

   Dyer's broom, a species of mignonette (Reseda luteola),
      used for dyeing yellow; dyer's weed; dyer's rocket.

   Spanish broom. See under Spanish.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Cytisus scoparius
    n 1: deciduous erect spreading broom native to western Europe;
         widely cultivated for its rich yellow flowers [syn: common
         broom, Scotch broom, green broom, Cytisus scoparius]