narrowleaf bittercress USDA PLANTS Symbol: CAIM
U.S. Nativity: Exotic
Habit: Forbs/Herbs
Cardamine impatiens L.

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Taxonomic Rank: Magnoliopsida: Capparales: Brassicaceae
Native Range: Europe, Asia (GRIN);

Appearance
Cardamine impatiens is an herbaceous plant which can be an annual or biennial. It can grow to be 2 ft. (0.6 m) in height. The stem is erect and glabrous. It is somewhat shade tolerant, so it does well in forest edges or dappled sunlight. It also does well in areas that have moist soil.
Foliage
The leaves (6-20) are thin and membranous. The basal rosette of leaves are pinnately divided. Each leaf has 3-11 leaflets with rounded lobes. The leaves along the stem are also pinnately divided, with sharply toothed or lacerate leaflets. These leaves are sagittate auriculate (a pair of fleshy blunt projections turned downward) at their base, which is an important diagnostic characteristic.
Flowers
The plant blooms from May to August and its white flowers are small, being up to 0.1 in. (2.5 mm) long.
Fruit
The slender siliques (a type of fruit) ripen from May to September. They are 0.6-0.8 in. (1.5-2 cm) long and there are 10-24 seeds in each of them which shoot out from the dry fruits.
Ecological Threat
Cardamine impatiens produces many seeds per plant. It can form dense stands invading woodland habitats, and outcompete native species.

Identification, Biology, Control and Management Resources

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


Plant(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Stem(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Foliage;
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
Leslie J. Mehrhoff, University of Connecticut, 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:
Connecticut Invasive Plant Working Group
Mid-Atlantic Exotic Pest Plant Council, 2005
New Jersey Department of Agriculture, Division of Plant Industry, 2004