The paintings by Diego Rivera entitled La Vendadora de Alcatraces show a woman with a basket of lilies. And alcatraz means pelican. Are lilies (liras) nicknamed pelicans en espanol'
Oh, here's a picture of a gannet (related to a pelican) in case you're curious.
If you look at this definition for alcatraz: (I wonder if that's were the prison got its name')
Notice the second definition: "botany: arum"
If you do a search for "arum" you will see that it refers to a lily.
Seems that you are not the only one confused by this painting. Notice the gender used by whoever translated the title in the link.