  The flower at a point x in a Steiner triple system (X; B) is the set of all
triples containing x. Denote by J3F(r) the set of all integers k such that
there exists a collection of three STS(2r+1) mutually intersecting in the same
set of k + r triples, r of them being the triples of a common flower.
  In this article we determine the set J3F(r) for any positive integer r = 0, 1
(mod 3) (only some cases are left undecided for r = 6, 7, 9, 24), and establish
that J3F(r) = I3F(r) for r = 0, 1 (mod 3) where I3F(r) = {0, 1,...,
2r(r-1)/3-8, 2r(r-1)/3-6, 2r(r-1)/3}.
