Lantana seed query

Morning everyone, we've just got back from a short holiday in Spain where I saw what I thought were beautiful orange verbena plants scrambling over walls.  Having now googled them I think they were Lantanas.  I thought I'd try to propagate some so collected what I thought were seeds but now I'm not sure they are.  The 'seeds' were large (4-5mm diameter), black balls attached to the flower part where the petals had been but they're rock hard like a ball-bearing.  Does anyone know if I've collected the wrong thing or do they just need a good soak next Spring before planting?  Many thanks.