Macrosyphonia Duby 1844 Dionysia is a genus containing 61 species of flowering plants in the family Primulaceae.

They are small, cushion-forming alpines native to mountains of Iran, Iraq, Turkey, sauth Turkmenistan, northwestern Pakistan, Tajikistan, Afghanistan and parts of Oman.

They are usually evergreen perennials with felted leaves, covered with bright yellow or pink, five-petalled flowers in spring.

The leaves are very drought resistant in some species and are reinforced with stone cells (sclerids) either around the nerves or freely in the leaf tissue.

Dionysia aretioides, with yellow flowers, has gained the Royal Horticultural Society's Award of Garden Merit.