Pacific stonecrop
This is a little beauty. Mat-forming and evergreen, this succulent is native to California north to Alaska. Tolerant of wet winters, the shiny round bead-like leaves turn a dark red in full sun. Stays compact and slowly spreads, 2 - 4 inches tall, reaching about 18 inches in diameter. Blooms starry yellow flowers in summer. Great in rock gardens, planters, useful as an edge plant. Adapts to many soil types. Fully hardy and drought tolerant once established. We have this planted in our trough in front of the greenhouse.
In above picture, Sedum divergens is in the dark-colored sedum in the middle, flanked by other sedums.