Section 18-103. Trees and vegetation; definitions

Whenever the word "street"
  or  the  plural  thereof occurs in sections 18-104, 18-105 and 18-106 of
  this title, it shall be deemed to include all that is  included  by  the
  terms  street, avenue, road, alley, lane, highway, boulevard, concourse,
  public square, and public place, or the  plurals  thereof  respectively;
  the  word  "tree"  or  the plural thereof shall be deemed to include all
  forms of plants having permanent woody self-supporting trunks; the  word
  "vegetation"  shall be deemed to include plants collectively of whatever
  name or nature not included under the term "tree".