Researchers at Oregon State University and the Agricultural … 2011 Steve Matson. Medusahead is an exotic, invasive, self-pollinated winter annual grass that germinates in the fall, overwinters as a seedling, and can have multiple flushes. It matures after most other annual vegetation has senesced. Medusa head. Stems are wiry and slender. Medusahead is an invasive annual grass. 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 … 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. Siskiyou. 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%. 2019 Jennifer Mo. Medusahead produces tillers but few leaves. r- Furthe more, mature medusahead seeds have long, stiff, sharp, barbedawns, which discourage seed pred a- tion. It's a Mediterranean grass accidentally brought to the Western U.S. in the 1880s. Like another troublesome annual grass, cheatgrass, medusahead initiates growth early in the growing season, reducing moisture for perennial grass species. Plants grow from 8 inches to 2 feet tall, depending on the site. Medusahead (Taeniatherum caput-medusae) is an invasive winter annual grass that grows 6 to 24 inches tall. Lewis Reed explains his project to control the exotic and invasive Medusa Head grass at Sycamore Grove Regional Park in Livermore, California. Multiple stems can emerge from the base of the plant, each producing a … It is typically 6 to 20 inches tall with distinct bristly seed heads. (Taeniatherum caput-medusae) It invades grasslands, forests, prairies, and disturbed areas such as grazed lands and fields. 2019 Ron Vanderhoff. ture (George 1992; Lusk et al. Once it dominates a … 2011 Steve Matson. 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. One of the most problematic annual grass weeds in California and the western United States is medusahead, which is estimated to infest about 1 million ha in the 17 western states (Duncan and Clark 2005). Medusahead is a winter annual native to the Mediterranean region. Cal-IPC rating: High. 1961). Medusahead (Taeniatherum caput-medusae (L.) Nevski), is a cool-season annual grass native to the Mediterranean region. 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