Comparing Lilies with Collards

We have scoured every blog with pictures of pollen, and much to our surprise, there is only one plant with the same qualities as our lilies: the collard greens, or Brassica oleracea.
  (Credit to Izzie Valle, Rebecca France, Takumi Herbert, and Race Stewart for both using this plant, and taking the following photos.)
This is what the collard greens look like:





Now that we have a plant that has a similar pollen, to answer our question, we have to determine whether or not it is closely related to lilies, genus Lilium.
We used the website uniprot.org to tell us where they connect in their lineage.
They both belong to the group, Mesangiospermae, which is one of four clades of angiosperms; it contains 99.5% of all flowering plants.  They have no further connections.  Based off of this information, we cannot say that lilies and collards are very closely related, as they are not more related than almost any other flower.
Likeness of pollen does not imply relatedness.