Target Species

The NIWP target species list is produced in consultation with local, regional, and national experts in botany, invasive species ecology, horticulture, and natural areas management. Species are selected based on known distribution and invasive tendencies in the program area, Illinois and the greater Midwest, Ontario Canada, and other regions of similar climate in United States.

Target species are listed in two general categories "New" and "Spreading". Species considered "new" to our program area have no known populations or very few isolated populations in the region. Others that have established localized populations within portions or all of the program area and are rapidly dispersing into new locations, but are not yet considered widespread, are categorized as "Spreading".

Several species on the target list are widely used in gardens and landscaping (indicated with an *). Those species tend to have broad distributions in developed landscapes, are known to be invasive in other regions of similar climate, but are not yet invading natural areas in our region. For these species we are interested in your reports of populations that are found outside of their intended landscape / garden planting areas (escaped).

New Target Species

Japanese Chaff Flower - Achyranthes japonica

Amur Peppervine - Ampelopsis brevipeduculata

Japanese Barberry - Berberis thunbergii

Butterfly Bush - Buddleja davidii

Flowering Rush - Butomus umbellatus

Narrow-leaf Bittercress - Cardamine impatiens

Black Swallow-wort - Cynanchum louiseae

Dog Strangling Vine - Cynanchum rossicum

Chinese Yam - Dioscorea polystachya

Great (Blue) Globe Thistle - Echinops sphaerocepals

Brazilian Elodea - Egeria densa

Water Hyacinth - Eichornia crassipes

Lyme Grass - Elymus arenarius

Burning Bush - Euonymus alatus

Reed Manna Grass - Glyceria maxima

Baby's Breath - Gypsophila paniculata

Giant Hogweed - Heracleum mantegazzianum

Japanese Hops - Humulus japonicus

Common Frogbit - Hydrocharis morus-ranae

Hydrilla - Hydrilla verticillata

Serecia Lespedeza - Lespedeza cuneata

Japanese Stilt Grass - Microstegium vimineum

Sacred Lotus - Nelumbo nucifera

Princess Tree - Paulownia tomentosa

Mile-a-minute Weed - Persicaria perfoliatum

Water Lettuce - Pistia stratoides

Kudzu - Pueraria montana var. lobata

Sawtooth Oak - Quercus acutissima

Fig Buttercup - Ranuculus ficaria var. bulbifera

Himalayan Blackberry - Rubus armeniacus

Wine Raspberry - Rubus phoenicolasius

Garden Valerian - Valeriana officinalis

New Target Insect Species

Asian Longhorned Beetle - Anoplophora glabripennis

Chinese Longhorn Beetle - Trichoferus campestris

Brown Marmorated Stink Bug - Halyomorpha halys

Spreading Target Plant Species

Wild Chervil - Anthriscus sylvestris

Oriental Bittersweet - Celastrus orbiculatus

Spotted Knapweed - Centaurea stoebe ssp. micranothos

Leafy Spurge - Euphorbia esula

Japanese Knotweed - Fallopia japonica

*Silver Grass - Miscanthus sinensis

*Amur silver grass - Miscanthus saccahriflorus

* Bradford Pear - Pyrus calleryana

Text and photos in these target species pages
have been borrowed liberally from several government
sources including the USDA (,
the US Forest Service, Michigan Depts of Agriculture & Natural Resources.
Any errors here are our own.

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Last updated October 2018 / Privacy