johnsongrass |
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| Cyperales > Poaceae > Sorghum halepense (L.) Pers.
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| Johnsongrass is a tall (up to 8 ft. [2.4 m]), rhizomatous, perennial grass that invades open areas throughout the United States. The 2 ft. (0.6 m) long, lanceolate leaves are arranged alternately along a stout, hairless, somewhat upward branching stem and have distinct, white midribs. Flowers occur in a loose, spreading, purplish panicle. Johnsongrass is adapted to a wide variety of habitats including open forests, old fields, ditches and wetlands. It spreads aggressively and can form dense colonies which displace native vegetation and restrict tree seedling establishment. Johnsongrass has naturalized throughout the world, but it is thought to be native to the Mediterranean region. It was first introduced into the United States in the early 1800s as a forage crop. |
Identification, Biology, Control and Management Resources
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| Number: | 1624081 |
| Description: | Infestation; Invasive plants complicate roadise begetation management programs, create safety hazards by obscuring visibility and increasing the intensity of roadsidefires, and provide seed sources for infestation of adjacent fields. |
| Photographer: | Bonnie Harper-Lore, Federal Highway Administration |
| | Additional Resolutions and Image Usage |
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| Number: | 5307057 |
| Description: | Diagram or Graphic; Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 1: 121. |
| Photographer: | USDA PLANTS Database, USDA NRCS PLANTS Database |
| | Additional Resolutions and Image Usage |
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| Number: | 5309001 |
| Description: | Diagram or Graphic; Hitchcock, A.S. (rev. A. Chase). 1950. Manual of the grasses of the United States. USDA Misc. Publ. No. 200. Washington, DC. |
| Photographer: | USDA PLANTS Database, USDA NRCS PLANTS Database |
| | Additional Resolutions and Image Usage |
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External Links
Invasive Reference(s)
Subject Reference(s)
- USDA, NRCS. 2001. The PLANTS Database, Version 3.1, National Plant Data Center, Baton Rouge, LA 70874-4490 USA. -
http://plants.usda.gov/
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