black mustard USDA PLANTS Symbol: BRNI
U.S. Nativity: Exotic
Habit: Forbs/Herbs
Brassica nigra (L.) W.D.J. Koch

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Taxonomic Rank: Magnoliopsida: Capparales: Brassicaceae
Synonym(s): shortpod mustard
Native Range: Eurasia (BAIL);

Appearance
Brassica nigra is an annual plant that can grow 2-8 ft. (0.6-2.5 m) tall, branching occasionally.
Foliage
The leaves are alternate up to 10 in. (25 cm) long and 3 in. (7.6 cm) across, becoming smaller as they ascend the stems. The lower leaves are pinnate and obovate. The upper surface of a lower leaf is often has scattered hairs that are stiff, short, and white.
Flowers
Flowers are in clusters that are 0.5-2 ft. (0.15-0.61 m) long when fully mature. Each flower can be 0.3 in. (7.6 mm) across, consisting of 4 yellow petals. The petals are rounded toward their tips. Flowers are in bloom during the summer.
Fruit
Fruit is about 0.67 in. (17 mm) long and tapering to a conical beak. The seeds are dark brown to black in color with a pungent taste.
Ecological Threat
Brassica nigra prefers disturbed areas including meadows, thickets, areas along railroads and roadsides. It is native to Eurasia.

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


Plant(s); In asphalt crack
John M. Randall, The Nature Conservancy, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Joseph M. DiTomaso, University of California - Davis, Bugwood.org
Additional Resolutions & Image Usage

Fruit(s);
Joseph M. DiTomaso, University of California - Davis, Bugwood.org
Additional Resolutions & Image Usage

Seed(s); Seeds in various positions, most with hilar region showing. Note course reticulations (thick veins).
D. Walters and C. Southwick, USDA, Bugwood.org
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Seed(s); Looking down at the hilar region of four seeds. The dark area underneath the whitish funicular remnant is sometimes clearly circular (as in the second seed from the left) and sometimes not.
D. Walters and C. Southwick, USDA, 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.

U.S. National Parks where reported invasive:
Badlands National Park (South Dakota)
Sequoia and Kings Canyon National Parks (Californina)
Yosemite National Park (California)



Invasive Listing Sources:
California Invasive Plant Council
Faith Campbell, 1998
Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
John Randall, The Nature Conservancy, Survey of TNC Preserves, 1995.