Across all tropical to sub-tropical continents, there are 5 species, with only a couple which can be grown outside in the UK. They can look like mini Lantana, which makes sense as they are in the same family, Verbenaceae.
The rounded heads of small tubular flowers are visited by bees, flies and butterflies while the creeping growth helps conserve water and provides shelter and refuge for invertebrates, including beneficial predators such as ground-beetles.