Unlike most Pacifica iris leaves, those of California's Iris macrosiphon (and Oregon's I. tenax) contain exceptionally strong fibers. The fibers provided a source of cordage for local peoples for thousands of years. Visitors wrote of twisted and woven iris fibers being used for string, bags, cloth, nets, and ropes. Steven Edholm and Tamara Wilder of the program "Paleotecnics" in Boonville, California, explain how the fibers are removed.
Each year, Paleotecnics offers many workshops throughout northern California on a wide variety of ancient living skills, including the use of fibers from wild plants. Check their web site at http://www.paleotechnics.com.