Related by context. Frequent words. (Click for all words.) 59 loosestrife 55 purple loosestrife 55 phragmites 55 aquatic weeds 55 Scotch broom 54 invasive species 54 Eurasian milfoil 54 lodgepole 54 spotted knapweed 54 invasives 53 aquatic habitats 53 nonnative plants 53 hemlock trees 53 cattails 53 hickories 53 grasses 53 woody plants 52 cattail 52 tidal marshes 52 Invasive species 52 invasive weeds 52 nonnative species 52 grassland habitat 52 species 52 hydrilla 52 riparian habitat 51 adelgids 51 knapweed 51 knotweed 51 kelp beds 51 barberry 51 adelgid 51 aquatic vegetation 51 invasive weed 51 eelgrass 51 grassland birds 51 Hydrilla 51 vegetation 51 aquatic ecosystem 51 invasive aquatic 51 seagrasses 50 red legged frogs 50 vetch 50 understory 50 overgrazed 50 hardwood trees 50 forbs 50 conifer trees 50 Japanese knotweed 50 aquatic weed 50 herbaceous plants 49 marsh grasses 49 cheatgrass 49 shrubby 49 duckweed 49 salt cedar 49 shade tolerant 49 Gypsy moths 49 eel grass 49 insect populations 49 fireweed 49 Florida panthers 49 moss 49 leafy spurge 49 weeds 49 lupines 49 milkweed 49 whiteflies 49 pampas grass 49 junipers 49 bracken 48 sedge 48 saltmarsh 48 sedges 48 buffelgrass 48 oleanders 48 Phytophthora 48 willows 48 filter feeders 48 conifers 48 Feral hogs 48 bee populations 48 cankers 48 ferns 48 tamarisk 48 hemlocks 48 Eurasian watermilfoil 48 habitat fragmentation 47 tussock 47 jack pine 47 berry bushes 47 garlic mustard 47 freshwater ecosystems 47 cottonwood trees 47 ragwort 47 giant sequoias 47 groundcover 47 chickweed 47 hemlock woolly adelgid 47 aquatic ecosystems 47 giant hogweed