Most Iris species propagate by means of an underground stem called a rhizome. A few species reproduce by developing bulbs with a netted covering instead of the rhizome. These are called the bulbous iris and there is some debate over their proper genus.

Until recently, the primary species in the group was Iris reticulata, however, it has been determined that these plants are actually in a new genus called Iridodictyum. So, they are now Iridodictyum reticulata.

These hardy, dwarf species, with rush-like leaves and mostly scented flowers, are excellent for rock gardens, the front of borders and containers. They are easy to grow and naturalize readily. There are also over a dozen named cultivars in shades of blue, violet and purple.

Other species that have bulbs rather than rhizomes include:

I. danfordiae I. histrio I. histrioides

I. bakeriana I. danfordiae Juno Iris

Cultivars in the group include:

'Cantab' 'Clairette' 'Gordon' 'Harmony' 'Hercules' 'Joyce' 'J.S. Dyt'

'Natasha' 'Pauline' 'Pixie' 'Royal Blue' 'Violet Beauty' 'Wentworth'