Botanical atlas

Zigzag Iris

Iris brevicaulis

Zigzag iris is one of the five wild Louisiana iris species, growing along the bayous, sloughs, and swamp margins of the Mississippi Delta, where its violet blue flowers have long marked the edge between dry ground and water. Nineteenth and twentieth century plant collectors prized it and its Louisiana iris cousins for hybridizing, and it helped give rise to the many garden iris cultivars grown today. Unlike some of its iris relatives, it does not carry a meaningful history of internal folk medicine use, since the rhizome that other cultures sometimes reached for in small, cautious doses is now understood to be irritating and unsafe. Its real inheritance is a horticultural one, prized for turning boggy, hard to plant corners of the yard into a season of color.

Safety.

Every part of Iris brevicaulis, especially the thick underground rhizome, contains irisin and related resinous glycosides that are toxic if eaten, and can bring on nausea, vomiting, drooling, and diarrhea in people, dogs, cats, and livestock. The clear sap can also irritate skin and eyes on contact, so gloves are worth wearing when dividing or transplanting the rhizomes. This is not a plant with a safe tradition of internal use, and it should be treated strictly as an ornamental for the garden pond edge, never as a tea, tincture, or food. Keep rhizomes and cut foliage well away from small children, curious pets, and grazing animals, and speak with a doctor, poison control, or veterinarian right away if ingestion is suspected.