Even though you have not provided a measurement of leaf width, the raised midvein on the back of a leaf can be easily seen. This is diagnostic. Graminifolium has leaves up to 3mm wide, and white to pink flowers. In Canberra it grows on sandstone based soils. The more common armeria subsp. armeria has leaves 3-15 wide, and the midvein is not obvious. Its flowers are pink to almost magenta, occasionally white. In Canberra it grows on non-sandy solis.