Flowering now in the rock garden is the European native, Anthyllis coccinea…aka: red kidney vetch. This small rock garden legume (Fabaceae) is still in its first full year in the ground, having been planted last June…so far, so good.
Red Kidney Vetch
botanic garden, crevice garden, dryland gardens, Dwarf Plants, European native perennials, groundcover, groundcover plants, groundcovers, groundcovers for sun, JLBG, juniper level botanic garden, orange flower, orange perennial flowers, Plant Delights Nursery, red flowers, rock garden perennial, rock garden plants, rock gardening, Tony Avent, trial gardens, zone 7b
Your vetch is pretty. The vetch in the US will swallow everything.
You are most likely referring to Crown vetch (Securigera varia), which is a horrid weed. It has been used for decades in the US for highway cut stabilization.