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Plants that have been assessed and categorized
by the
Rhode Island Invasive Species Council, as of
2/28/2001
- This list is for informational
purposes only; it has no legal or regulatory stature.
- The list does NOT include every
plant that is invasive in Rhode Island, but is a list of those plants
that have been assessed to date, using the established criteria.
Download
this list (PDF, 34kB)
Widespread and Invasive
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Cabomba caroliniana
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Fanwort
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Celastrus orbiculatus
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Asiatic Bittersweet
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Elaeagnus umbellata
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Autumn Olive
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Lonicera japonica
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Japanese Honeysuckle
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Lythrum salicaria
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Purple Loosestrife
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Polygonum cuspidatum [= Fallopia japonica]
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Japanese Knotweed
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Potamogeton crispus
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Curly Pondweed
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Rhamnus cathartica
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Common Buckthorn
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Rosa multiflora
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Multiflora Rose
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Vincetoxicum nigrum [= Cynanchum nigrum]
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Black Swallowwort
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(back to top)
Restricted and Invasive
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Ailanthus altissima (a)
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Tree of Heaven
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Alliaria petiolata(a)
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Garlic Mustard
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Ampelopsis brevipedunculata
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Porcelain-berry
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Myriophyllum heterophyllum
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Variable Water-milfoil
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Ranunculus ficaria
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Lesser Celandine
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Rorippa nasturtium-aquaticum
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Watercress
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Rubus phoenicolasius (b)
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Wineberry
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Vincetoxicum rossicum [= Cynanchum rossicum]
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White Swallowwort
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Agreed are invasive
but need more information
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Acer platanoides (b)
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Norway Maple
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Berberis thunbergii (b)
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Japanese Barberry
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Euonymus alatus (b)
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Burning Bush
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Lonicera morrowii and Lonicera x Bella (b)
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Morrow and Bella Honeysuckle
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Needs more research
and observation/monitoring
Many of these species are known to be invasive in
neighboring states.
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Acer pseudoplatanus
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Sycamore Maple
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Allium vineale
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Field-garlic
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Berberis vulgaris
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European Barberry
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Campsis radicans
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Trumpet Creeper
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Clematis terniflora [= C. paniculata]
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Autumn Clematis
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Cytisus scoparius
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Scotch Broom
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Daucus carota
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Queen Anne’s Lace
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Elaeagnus angustifolia
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Russian Olive
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Euonymus fortunei
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Winter Creeper
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Hesperis matronalis
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Dame’s Rocket
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Iris pseudoacorus
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Yellow Flag
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Kochia scoparia
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Summer Cypress
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Ligustrum species (d)
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Privet
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Miscanthus sinensis
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Eulalia
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Morus alba
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White Mulberry
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Myosotis scropioides
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True Forget-me-not
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Phellodendron japonicum
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Amur Corktree
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Phragmites australis (e)
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Common Reed
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Pinus thunbergiana
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Japanese Black Pine
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Polygonum sachalinense
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Princess Feather
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Quercus robur
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English Oak
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Rhamnus frangula [ = Frangula alnus] (d)
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Glossy Buckthorn
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Robinia pseudoacacia
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Black Locust
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Rosa rugosa (f)
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Beach Rose
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Yucca filamentosa
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Spanish Bayonet
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Potentially Invasive
Species
These are invasive in other states but have
not yet become so in Rhode Island.
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Egeria densa [= Elodea densa] (g)
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Brazilian Waterweed
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Hydrilla verticillata (h)
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Hydrilla
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Lysimachia nummularia (i)
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Moneywort
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Microstegium vimineum (j)
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Japanese Stiltgrass
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Myriophyllum spicatum (h)
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Eurasian Water-milfoil
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Najas minor (h)
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Eutrophic Water-nymph
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Pistia stratiotes (k)
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Water-lettuce
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Polygonum perfoliatum (l)
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Mile-a-minute Weed
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Trapa natans (h)
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Water-chestnut
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(back
to top)
Weedy
Plants of disturbed areas; do not appear to
be affecting minimally managed habitats. This list is not even close to
all the non-native “weedy” plants in Rhode Island. The ones below were
in the original list assessed by the RIISC during 2000; if a plant wasn’t
on that list or wasn’t brought up subsequently as potentially meeting
the criteria for an invasive species in the state, it is not included
here.
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Aegopodium podagraria
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Goutweed
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Bromus tectorum
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Drooping Brome Grass
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Centaurea nigra, C. dubia, C. maculosa, etc.
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Knapweeds
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Cirsium arvense
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Canada Thistle
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Cirsium vulgare
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Bull Thistle
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Coronilla varia
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Crown Vetch
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Euphorbia cyparissias
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Cypress Spurge
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Glechoma hederacea
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Ground Ivy
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Lamium amplexicaule
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Henbit
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Lamium purpureum
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Purple Dead-nettle
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Rumex acetosella
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Sheep Sorrel
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Solanum dulcamara
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European Nightshade
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(back
to top)
Footnotes:
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a
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Spreading
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b
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need more information on its spread in
RI
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c
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fits Criteria 1–9 and is widespread; need
to assess reproductive capabilities of cultivars and hybrids
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d
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fits Criteria 1–5 and is spreading; we
need to know which species are the ones that naturalize and spread
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e
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assessing locations of native non-aggressive
populations
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f
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fits Criteria 1–9; suggested “fast-track”
monitoring
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g
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12/2005: known from one site in the state
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h
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12/2005: not yet confirmed in RI
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i
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reported from RI but not assessed as invasive
as of 12/2005
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j
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“Restricted + invasive” in CT; reported
in several RI sites in summer 2005
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k
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12/2005: reported in RI waters but has
not yet been found to survive winter
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l
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12/2005: known from one site in the state
where it is being controlled
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Sections:
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