itchgrass USDA PLANTS Symbol: ROCO6
U.S. Nativity: Exotic
Habit: Grass or Grasslike
Rottboellia cochinchinensis (Lour.) W.D. Clayton

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Taxonomic Rank: Liliopsida: Cyperales: Poaceae
Synonym(s): corngrass, raoulgrass

Appearance
Rottboellia cochinchinensis is an annual grass that invades disturbed and agricultural areas throughout the southeastern United States.
Foliage
Stems and leaves are covered with stiff, irritating hairs. Stems can reach a height of 1-10 ft. (0.3-3 m). Leaf blades are 5.9-17.7 in. (15-45 cm) long, 0.2-0.8 in. (5-20 mm) wide and flat.
Flowers
The inflorescence is a jointed, cylindrical raceme, 1-6 in. (2.5-15.24) long.
Fruit
Under favorable conditions, Rottboellia cochinchinensis starts producing seeds 6-7 weeks after emergence. Seed production continues throughout the growing season.
Ecological Threat
Rottboellia cochinchinensis invades agricultural fields and other disturbed areas. The hairs on the stems and leaves can cause severe irritation, and the plant is unpalatable to livestock and wildlife. It is native to the Old World tropics, but it is currently widespread throughout the world’s tropical regions and in the southeastern United States.

Identification, Biology, Control and Management Resources

Selected Images from Invasive.orgView All Images at Invasive.org


Plant(s);
USDA APHIS PPQ - Oxford, North Carolina , USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
USDA APHIS PPQ - Oxford, North Carolina , USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
USDA APHIS PPQ - Oxford, North Carolina , USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Spikelet(s); Disseminules comprising internode with embedded spikelet and pedicel; far right: disseminule with pedicellate spikelet
Julia Scher, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Fruit(s); Caryopses in ventral view (left) and dorsal view (right)
Julia Scher, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Fruit(s);
Steve Hurst, USDA NRCS PLANTS Database, Bugwood.org
Additional Resolutions & Image Usage

Seedling(s); Inflorescence segments. FNW taxon.
Julia Scher, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Feature(s); Disseminules comprising internode with embedded spikelet and pedicel; far right: disseminule with pedicellate spikelet. FNW taxon.
Julia Scher, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Feature(s); Views of disseminule showing pedicel and lower glume of embedded spikelet (left) and rachis internode (right). FNW taxon.
Julia Scher, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Fruit(s); Caryopsis in ventral (left) and dorsal (right) views. FNW taxon.
Julia Scher, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

EDDMapS Distribution:
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org
 


State(s) Where Reported invasive.
Based on state level agency and organization lists of invasive plants from WeedUS database.


Invasive Listing Sources:
Georgia Exotic Pest Plant Council