such city shall have power, by ordinance upon and in accordance with
the recommendation of the board of park commissioners, to lay off and
divide the territory thereof into any number of park districts that the
conveniences of the citizens of such city and of administration of the
department of public parks may require; and, after such districts are
established, may from time to time, in like manner, add new territory
to any established district, or create new districts from territory
which may be annexed to any such city. When such division is thus made
of the territory of any such city into districts, or when alterations
are thus made in the districts, the boundaries thereof shall be
accurately defined, and the descriptions of boundaries shall be entered
by such board at full length in the records of such board and shall be
recorded in the office of the recorder of the county in which such city
is situated; and a duly authenticated copy thereof shall be filed with
the comptroller of such city.