Exacum is a plant species that is known for its colorful, bell-shaped flowers. If you're looking for synonyms to describe Exacum, there are a few terms that might be useful. For example, you might describe the plant as "vibrant," "lush," or "lively." Other possible descriptors might include "flourishing," "flamboyant," or "radiant." Depending on the context, you could also use terms like "splendid," "dazzling," or "jaw-dropping" to describe the beauty of Exacum's flowers. Overall, there are many different synonyms that could be used to convey the charm and vibrancy of Exacum.