Iris reticulata 'Cantab': flowers

Iris reticulata, known in English as reticulated iris, dwarf wild iris, and rockgarden iris, and in French as iris réticulé, is a dwarf perennial native to southern Russia, Iran, and Turkey. The flowers appear very early in the spring, about 10 cm from the ground; later long thin leaves grow to 20-30 cm before the plant goes dormant at the end of spring.

This light blue cultivar is 'Cantab', which I bought at Veseys; different cultivars include blues and violets, as well as white.