Thanks to both of you.
I probably should have added that at one time my lantana did have many blooms that lasted from summer into fall. But we've had stranger than usual weather and maybe that's a factor. Case in point is that last Friday there were heavy thunderstorms and even 4 tornadoes in this general area. And yet today was close to 80F. This is the middle of January, folks! Maybe my plants are as confused by the weather as I am.