You definitely should take a picture of it. The people who frequent the Plant ID Forum are aces at identification.
Violets are killers, I agree. The shorter varieties of Alstroemeria are really nice between roses, but they're pricey. The tall ones flop over and look awful unless they're so dense that they do choke other plants.
I think I'll be heavily dependent on annuals as space fillers between the roses. They'll be dead by the time I prune, so I'll be able to step wherever I want, and our rainy season will keep the roses well watered even if the ground is bare. I'll just have to be quick about planting the annuals before the rain stimulates weed growth in March or April.
