| Ailanthus altissima (Mill.) Swingle | Tree-of-heaven |
| Alliaria petiolata (Bieb.) Cavara & Grande | Garlic Mustard |
| Berberis thunbergii DC. | Japanese Barberry |
| Celastrus orbiculatus Thunb. | Asiatic Bittersweet |
| Centaurea biebersteinii DC. | Spotted Knapweed |
| Euphorbia cyparissias L. | Cypress Spurge |
| Frangula alnus Mill. | European Buckthorn |
| Hesperis matronalis L. | Dame's Rocket |
| Lonicera xbella Zabel | Bella Honeysuckle |
| Lonicera morrowii A. Gray | Morrow's Honeysuckle |
| Lythrum salicaria L. | Purple Loosestrife |
| Nasturtium officinale R. Br. | Watercress |
| Phragmites australis (Cav.) Trin. | Common Reed |
| Polygonum cuspidatum Sieb. & Zucc. | Japanese Knotweed |
| Rhamnus cathartica L. | Buckthorn |
| Robinia pseudoacacia L. | Black Locust |
| Rosa multiflora Thunb. | Multiflora Rose |
| Tussalago farfara L. | Coltsfoot |
| Vincetoxicum nigrum (L.) Moench | Black Swallow-wort |
| Aegopodium podagraria L. | Goutweed |
| Ampelopsis brevipedunculata (Maxim.) Trautv. | Porcelain berry |
| Butomus umbellatus L. | Flowering-rush |
| Cabomba caroliniana A. Gray | Fanwort |
| Cardamine impatiens L. | |
| Elaeagnus umbellata Thunb. | Autumn Olive |
| Euonymus alatus (Thunb.) Sieb. | Winged Euonymus |
| Glyceria maxima (Hartman) Holmburg | Tall Mannagrass |
| Iris pseudacorus L. | Yellow Iris |
| Lepidium latifolium L. | Tall Pepperwort |
| Lonicera japonica Thunb. | Japanese Honeysuckle |
| Lysimachia nummularia L. | Moneywort |
| Lysimachia vulgaris L. | Garden Loosestrife |
| Microstegium vimineum (Trin.) A. Camus | Japanese Stilt Grass |
| Myriophyllum heterophyllum Michx. | Variable Water-milfoil |
| Myriophyllum spicatum L. | European Water-milfoil |
| Potamogeton crispus L. | Crispy-leaved Pondweed |
| Rubus phoenicolasias Maxim. | Wineberry |
| Trapa natans L. | Water Chestnut |
| Vincetoxicum rossicum (Kleo.) Barb. | Swallow-wort |
| Acer ginnala L. | Amur Maple |
| Acer platanoides L. | Norway Maple |
| Acer pseudoplatanus L. | Sycamore Maple |
| Aira caryophyllea L. | Silver Hairgrass |
| Allium vineale L. | Wild Garlic |
| Alnus glutinosa (L.) Gaertner | European Black Alder |
| Amorpha fruticosa L. | False Indigo |
| Arthraxon hispidus (Thunb.) Makino | |
| Berberis vulgaris L. | Barberry |
| Bromus tectorum L. | Drooping Brome-grass |
| Callitriche stagnalis Scop. | |
| Carex kobomugi Ohwi | |
| Catalpa bignonioides Walter | Southern Catalpa |
| Catalpa speciosa Warder | Northern Catalpa |
| Cirsium arvense (L.) Scop. | Canada Thistle |
| Cirsium palustre (L.) Scop. | Marsh Thistle |
| Cycloloma atriplicifolium (Spreng.) Coult. | Winged Pigweed |
| Cytisus scoparius (L.) Link | Scotch Broom |
| Datura stramonium L. | Jimsom-weed |
| Deschampsia caespitosa (L.) Beauv. var. parviflora(Thuill.) Richter | Tufted Hairgrass |
| Egeria densa Planchon | Brazilian Water-weed |
| Elaeagnus angustifolia L. | Russian Olive |
| Elsholtzia ciliata (Thunb.) Hylander | Elsholtzia |
| Epilobium hirsutum L. | Hairy Willow-herb |
| Euphorbia esula L. | Leafy Spurge |
| Froelichia gracilis (Hook.) Moq. | Cottonweed |
| Geranium nepalense Sweet | Nepalese Crane's-bill |
| Glechoma hederacea L. | Gill-over-the-ground |
| Humulus japonicus Sieb. & Zucc. | Japanese Hops |
| Hydrilla verticillata (L. f.) Royle | Hydrilla |
| Hydrocharis morsus-ranae L. | European Frog's bit |
| Impatiens glandulifera Royle | |
| Kochia scoparia (L.) Schrader | Summer Cypress |
| Ligustrum obtusifolium Sieb. & Zucc. | Border Privet |
| Ligustrum ovalifolium Hassk. | California Privet |
| Ligustrum vulgare L. | European Privet |
| Lonicera maackii (Rupr.) Maxim. | Amur Honeysuckle |
| Lonicera tatarica L. | Tatarian Honeysuckle |
| Lonicera xylosteum L. | European Fly-honeysuckle |
| Lychnis flos-cuculi L. | Ragged Robin |
| Marsilea quadrifolia L. | Water Shamrock |
| Miscanthus sinensis Anderss. | Eulalia |
| Myosotis scorpioides L. | Forget-me-not |
| Myriophyllum aquaticum (Vell.) Verdc. | Parrotfeather |
| Najas minor Allioni | Eutrophic Water-nymph |
| Nelumbo lutea (Willd.) Pers. | American Water Lotus |
| Nymphoides peltata (Gmel.) Kuntze | Yellow Floating Heart |
| Ornithogalum umbellatum L. | Star of Bethlehem |
| Paulownia tomentosa (Thunb.) Steudel | Empress-tree |
| Phalaris arundinacea L. | Reed Canary-grass |
| Poa compressa L. | Canada Blue-grass |
| Polygonum cespitosum Blume | |
| Polygonum perfoliatum L. | Mile-a-minute Vine |
| Populus alba L. | White Poplar |
| Pueraria lobata (Willd.) Owhi | Kudzu-vine |
| Rosa rugosa Thunb. | Japanese Rose |
| Ranunculus ficaria L. | Lesser Celandine |
| Rumex acetosella L. | Sheep Sorrel |
| Senecio jacobea L. | Stinking Willie, Tansy Ragwort |
| Silphium perfoliatum L. | Cup-plant |
| Solanum dulcamara L. | Climbing Nightshade |
| Valeriana officinalis L. | Garden-heliotrope |
| Veronica beccabunga L. | Brooklime |
Are these naturalized anywhere in New England?
| Azolla caroliniana Willd. | Eastern Mosquito Fern |
| Eichhornia crassipes (Mart.) Solms-Laub. | Water Hyacinth |
| Pistia stratiotes L. | Water Lettuce |
Suggested for inclusion but in need of supporting documentation:
| Eragrostis curvula (Schrader) Nees | Weeping Love-grass |
| Lespedeza cuneata (Dumont) G. Don | |
| Phellodendron japonicum Maxim. | Cork-tree |
| Taxus cuspidata Sieb. & Zucc. | Japanese Yew |
These species have been tentatively placed in these categories using criteria developed for this purpose. Copies of the criteria can be obtained by contacting me at the address below or visiting the CT Invasive Plant Working Group web page http://www.eeb.uconn.edu/invasives. Please send me comments and recommendations for status changes, additions or deletions. Give supporting evidence for these recommendations.
Leslie J. Mehrhoff
George Safford Torrey Herbarium
Box U-43
University of Connecticut
Storrs, CT 06269-3043
(860) 486-1889
FAX (860) 486-6364