This is the form most often available here in the Northwest and which may well be a hybrid with Vancouveria planipetala.  The flowers are much paler and a smidge smaller than typical Vancouveria chrysantha from our observations.  Regardless, a first rate evergreen ground cover which is drought tolerant.

Redwood Ivy.  This is a premier groundcover which is nothing like ivy.  You will never find this choice species on a noxious weed list.  Evergreen leaves forming a slow carpet with delicate white "inside-out" flowers suspended above like celestial motes of light.  Drought tolerant!

A collection from northern California where this mingled with Pseudotrillium rivale and Rhododendron occidentale among other tantalizers.  This one has flowers noticeably larger than the other forms we grow which means the tiny white flowers make the leap from speck to mote.  Vigorous evergreen groundcover for shade that tolerates dry which slows its spread.