The flamboyant Hibiscus senensis is now readily available as a housplant from garden centres. This yellow flower was growing on an Italian road side.
In a conservatory this evergreen is a neat rounded shrub. Good drainage and light are required for good flowering but plants can have a very long life.
If you want to know more about the species of Hibiscus you could do worse than read a book ‘Hibiscus Hardy and Tropical Plants for the Garden’ by Barbara Taylor Lawton extracts of which can be found here.