Pacific Northwest Gardening: help identify this flower, 1 by Photographer

Photographer wrote:
I have this small clump of day lily like plant. It resembles a crocus above ground but down below the roots are tuberous ..... just like day lily or agapanthus. I will upload a pic but for now it looks like a very hardy day lily or even slender tulip leaves coming up in a bunch. This flower came from a garden of a friend near Twin Falls, Idaho and the owner doesn't seem to know any more than I as yet. The flower comes up in yellow like a day lily but only the size of a crocus. The flower itself is pointed tips on 5 yellow petals .... very unlike a crocus. I've read of a plant like this from Turkey or Greece like the muscari but again ... no bulbs but longer stingy tubers.