Like another troublesome annual grass, cheatgrass, medusahead initiates growth early in the growing season, reducing moisture for perennial grass species. Due to the high silica content, particularly once seed is set (Murphy and Turner 1959), medusahead is of little value in livestock production and wildlife habitat. Siskiyou. Elymus caput-medusae, a monocot, is an annual grass that is not native to California; it has been naturalized in the wild. Once it dominates a … Medusahead (Taeniatherum caput-medusae) is an invasive winter annual grass that grows 6 to 24 inches tall. It is typically 6 to 20 inches tall with distinct bristly seed heads. Lewis Reed explains his project to control the exotic and invasive Medusa Head grass at Sycamore Grove Regional Park in Livermore, California. (Taeniatherum caput-medusae) It invades grasslands, forests, prairies, and disturbed areas such as grazed lands and fields. 2019 Ron Vanderhoff. Researchers at Oregon State University and the Agricultural … Medusahead produces tillers but few leaves. It matures after most other annual vegetation has senesced. 2011 Steve Matson. ture (George 1992; Lusk et al. Plants grow from 8 inches to 2 feet tall, depending on the site. 1961). Medusa head. Medusahead is an exotic, invasive, self-pollinated winter annual grass that germinates in the fall, overwinters as a seedling, and can have multiple flushes. Medusahead (Taeniatherum caput-medusae (L.) Nevski), is a cool-season annual grass native to the Mediterranean region. Medusahead is an invasive annual grass. In the western United States, it decreases shrub/perennial grass ecosystems and native vegetation, shifting it to an... Reduces the value of grazing lands by more than 80%. In Wyoming, was previously found in Sheridan County, and this is the first time it has been identified in Converse County. Cal-IPC rating: High. It's a Mediterranean grass accidentally brought to the Western U.S. in the 1880s. r- Furthe more, mature medusahead seeds have long, stiff, sharp, barbedawns, which discourage seed pred a- tion. Invasive annual grasses, such as cheatgrass ( Bromus tectorum) and medusahead ( Taeniatherum caput-medusae), are one of the most significant stressors to rangeland ecosystems in the western U.S. Their expansion and dominance across this area are the most damaging ecosystem agents on … Stems are wiry and slender. Medusa-head grass The High Desert Chapter has been assisting the Crooked River National Grasslands of the Ochoco National Forest with a special project to help understand how to control medusa-head invasive grasses on the Grasslands. 2011 Steve Matson. Multiple stems can emerge from the base of the plant, each producing a … Medusahead is a winter annual native to the Mediterranean region. 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