Boy,are you good!!!
Yup,I misspelled silene,I looked it up also and I do have a variegated silene that sure looks like Druetts.Nothing else they say about it matches mine
Mine is happiest in full sun in the hottest part of the yard and dries out frequently with no problems.Mounding? Mine hangs several feet over the pot edge in a thick sheet.I tried to transplant it to a richer,shadier location where it would get more water this summer and it didn't do nearly as well.My Sunset Western Garden book describes it as s.uniflora (s.vulgaris maritima) accurately but the web site I find on it shows a totally different
plant.I bought mine 3 years ago as a tiny
plant and every fall I whack it in half to give starts to those who have asked.This year I divided my half into 3rds and stuck it back up on my inhospitable hill with my sedums.It is a nice
plant.
I wish the information sites and books could agree