f₁ (1%): stem
  x′ = 0
  y′ = 0.16y
f₂ (85%): leaflets
  x′ = 0.85x+0.04y
  y′ = −0.04x+0.85y+1.6
f₃ (7%): left
  x′ = 0.2x−0.26y
  y′ = 0.23x+0.22y+1.6
f₄ (7%): right
  x′ = −0.15x+0.28y
  y′ = 0.26x+0.24y+0.44