1. Citronella Geranium
Not all citronell geraniums will repel mosquitos, but this particular kind (formally known as Pelargonium Citrosum) will produce an aroma that smells like citronella oil and ward off bugs.
2. Floss Flower
These are not the most powerful repellant, but they do produce an aroma that mosquitos are not fond of.
This was originally used as a perfume. Essential oils and extracts from this plant are very effective at keeping mosquitos away. These plants are now a go-to ingredient for many commercial repellants.