Silk Floss tree or Ceiba speciosa.
Strange spiky-trunked tree with pink flowers
in the Oratorio Santa Cita (another church full of stuccos by Serpotta).
These hardy trees are actually native to South America, related to baobabs,
conserve water and use thorns to prevent animals climbing them. They
have been widely planted for decoration in sub-tropical areas of Spain
and Italy.