Plants

Below are plants introduced through the marketplace.

Not all are causing harm, but many are invasive in the U.S. 

Algae

Sphacelaria fluviatilis 
Brown algae
Sphacelaria lacustris 
Brown algae

Vascular Plants

Alternanthera philoxeroides
Alligator weed
Azolla pinnata  
Feathered mosquito fern
Bacopa egensis   
Brazilian waterhyssop
Butomus umbellatus 
Flowering rush
Cabomba caroliniana 
Carolina fanwort
Colocasia esculenta
Coco yam
Conium maculatum  
Poison hemlock
Cryptocoryne beckettii
Water trumpet
Egeria densa  
Brazilian waterweed
Eichhornia azurea  
Anchored water hyacinth, floating water hyacinth
Eichhornia crassipes  
Water hyacinth
Elodea canadensis
Canadian waterweed
Epilobium hirsutum  
Great hairy willow herb
Glossostigma cleistanthum  
Mud mat
Hydrilla verticillata
Hydrilla
Hydrocharis morsus-ranae  
European frogbit
Hygrophila polysperma  
Indian hygrophila
Impatiens glandulifera
Ornamental jewelweed
Ipomoea aquatica
Water spinach, swamp morning glory
Iris pseudacorus 
Yellow iris
Juncus inflexus 
Rush, European meadow rush
Landoltia punctata
Dotted duckweed
Ludwigia grandiflora
Large-flower primrose-willow
Ludwigia peploides
Creeping water primrose, floating primrose
Lupinus polyphyllus 
Lupine
Lysimachia nummularia
Moneywort
Lysimachia vulgaris  
Garden loosestrife
Lythrum salicaria
Purple loosestrife
Marsilea quadrifolia
European water clover
Mentha spicata
Spearmint
Myosotis scorpioides 
True forget-me-not
Myriophyllum aquaticum
Parrot feather, Brazilian watermilfoil
Myriophyllum heterophyllum  
Variable leaf watermilfoil, twoleaf watermilfoil
Myriophyllum spicatum
Eurasian watermilfoil
Najas minor
Brittle waternymph
Nasturtium officinale
Watercress
Nymphaea ampla
Dot-leaf water lily
Nymphaea odorata
Fragrant water lily
Nymphoides cristata
Crested floating heart
Nymphoides indica  
Water snowflake
Nymphoides peltata 
Yellow floating heart
Phyllanthus fluitans  
Red root floater
Pistia stratiotes
Water lettuce
Potamogeton crispus
Curlyleaf pondweed
Salvinia minima  
Water spangles
Salvinia molesta
Giant salvinia
Solanum dulcamara
Bittersweet nightshade
Spartina alterniflora   
Smooth cordgrass
Spartina patens
Saltmeadow cordgrass
Trapa natans 
Water chestnut
Zostera japonica
Dwarf eelgrass