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There are often local incursions of nonindigenous species that would make a person think that the species is invasive. Often these local incursions that proliferate rapidly are the result of some environmental factor or combination of factors that encourage this sort of rapid growth
Group 1 - Seemingly invasive non-native species that usually do not disperse far from site of original intentional introduction. Many grasses used as forage crops might be included here.
| Akebia quinata Dcne. Clematis terniflora DC. Coronilla varia L. Euonymus fortunei Hand.-Mazz. Hedera helix L. Hemerocallis fulva L. Lespedeza cuneata (Dum. Cours.) G. Don Pachysandra terminalis Siebold & Zucc. Sorbaria sorbifolia (L.) A. Braun Vinca minor L. |
Akebia Yam-leaved Clematis Crown-vetch Climbing Euonymus English Ivy Orange Day-lily Chinese Lespedeza Pachysandra Sorbaria Common Periwinkle |
Group 2 - Native or potentially native species that may have some populations that are non-indigenous and invasive.
| Acer negundo L. Aralia spinosa L. Podophyllum peltatum L. Xanthium strumarium L. |
Box-elder Hercules' Club May-apple Common Cocklebur |
Group 3 - Taxa reported from New England but that do not appear to be invasive at this time, however, these taxa are acknowledged problems as invasive non-native species in nearby states or similar habitats. Aggressive invasiveness into "natural" habitats may be questionable. Please report any sites where these species appear to be aggressively invading natural habitats.
| Ajuga reptans L Aralia elata Seem. Carduus nutans L. Cirsium vulgare (Savi) Tenore Cycloloma atriplicifolium (Spreng.) Coult. Fumaria officinalis L. Galium mollugo L. Lonicera standishii Jacq. Mirabilis nyctaginea (Michx.) MacM. Morus alba L. Phellodendron japonicum Maxim. Ribes sativum Syme Taxus cuspidata Sieb. & Zucc. Viburnum dilatatum Thunb. Viburnum opulus L. var. opulus Viburnum plicatum Thunb. Viburnum sieboldii Miq. |
Carpet-bugle Japanese Angelica-tree Musk-thistle Bull-thistle Winged Pigweed Fumitory Wild Madder Heart-leaved Umbrella-wort Guelder rose |
Group 4 - Taxa not currently known to exist in New England but might be anticipated because of populations nearby in adjacent states. In addition, any taxon included here is known to be invasive in similar habitats in other states. These may not become naturalized.
| Eichhornia crassipes (Mart.) Solms-Laub. Murdannia keisak (Hassk.) Hand.-Mazz. Salvinia molesta complex |
Water Hyacinth Murdannia Giant Salvinia |
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