giant foxtail
Setaria faberi Herrm.
Description from Invasive.org
- Appearance
- Setaria faberi is an annual grass that can reach 2-5 ft. (0.61-1.5 m) in height.
- Foliage
- Leaves are up to 16 in. (41 cm) long, 0.6-1 in. (15-25 mm) wide. Sheath is round with hair on margins. Blade has short hairs cover the upper surface. Ligule has a fringe of hairs. There are no auricles.
- Flowers
- Flowering occurs in late summer to early fall, when a green (eventually straw colored), bristly inflorescence develops. The inflorescence resembles a foxtail, hence the common name.
- Fruit
- The fruit are small flattened ovoids with hard coats. They usually germinate in late spring to early summer.
- Ecological Threat
- Setaria faberi is native to Asia and was accidentally introduced in the United States in the 1920s as a contaminant of other grain. Plants invade disturbed sites such as roadsides, landfills, fence rows and right of ways.
- Herbicide Resistance
- Populations of this plant exist in the United States that are resistant to ACCase inhibitors (A/1), ALS inhibitors (B/2), and Photosystem II inhibitors (C1/5).
Resources
- Weed of the Week - USDA Forest Service
Selected Images from Invasive.org
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Foliage
John D. Byrd, Mississippi State University, Bugwood.org
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Feature(s) Ligule
John D. Byrd, Mississippi State University, Bugwood.org
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Plant(s) Hitchcock, A.S. (rev. A. Chase). 1950. Manual of the grasses of the United States. USDA Misc. Publ. No. 200. Washington, DC.
USDA NRCS PLANTS Database , USDA NRCS PLANTS Database, Bugwood.org
Additional Resolutions & Image Usage
Plant(s) USDA NRCS. Wetland flora: Field office illustrated guide to plant species. USDA Natural Resources Conservation Service.
USDA NRCS PLANTS Database , USDA NRCS PLANTS Database, Bugwood.org
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Stem(s) collar and sheath.
Joseph M. DiTomaso, University of California - Davis, Bugwood.org
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Spikelet(s) Spikelets in ventral view, the one on the left at an angle.
D. Walters and C. Southwick, USDA, Bugwood.org
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Distribution