Also known as:
Humped Bladderwort
E. and S. U.S.A

General description

Mat forming alga-like perennial, submerged just below water surface or entangled with other plants. Carnivorous plant with complex modified underwater appendages or 'sacs' which trap insects and other small animals. Has no roots, very thin stems with small filament-like leaves, which are either single or paired with sacs (1-2 mm long). Yellow flowers (6 mm diameter) protrude <20 cm above the water surface (Dec- May).

Aquatic: Free floating. Most freshwater habitats, especially acidic and nutrient rich

Vegetative fragments and seed

May outcompete native species.

Site management

Recommended approaches

1. Mechanical removal or weed matting at small sites.
2. There are no known chemical control methods.

Caution: when using any herbicide or pesticide PLEASE READ THE LABEL THOROUGHLY to ensure that all instructions and safety requirements are followed.

RPMS status

Surveillance - Whole Region
National Pest Plant Accord species - nationwide
bladderwort - Main species image