The Long Island Invasive Species Management Area
Early Detection Species - Be on the lookout!
These are in low abundance and are managed for eradication in LIISMA
CLICK HERE to see their status in New York in the lists of early detection species
Hardy Kiwi (Actinidia arguta)
Look for this woody vine with flaky bark in secondary to mature deciduous woodlands
More research is needed to establish its invasive nature.
Asiatic Sand Sedge (Carex kobomugi)
Look for this on sand dunes on the south shore of Long Island and Staten Island.
Leafy Spurge (Euphorbia esula)
Look for this in sandy open uplands and dunes.
Caper Spurge (Euphorbia lathyris)
Japanese Walnut (Juglans ailantifolia)
Photos from Wikipedia Commons
Japanese Walnut was found naturalizing in Orient, Suffolk County in 2010 by Daniel Atha. The trees were in a residential area and the edge of a woodland. This species has not been known to naturalize in North America until this find even though it has been in cultivation since 1860. It is not susceptible to walnut canker like our native walnuts. More information can be found at the Wikipedia Commons site. It is unknown if this new population will persist but more surveys will be done in 2012 to understand its distribution in this area.
To identify the species you can use this key:
1. Terminal leaflet absent or reduced in size. Not sticky to the touch. Husk globoid, 3,5-8 cm wide (the largest resembling a tennis ball), 1-2 (-3-5)/short raceme. Nut globoid, 3-4 cm, with numerous warty ridges. .................................................................................................................................................... Juglans nigra
1. Terminal leaflet always present and well developed. Very sticky to the touch in all parts due to glandular hairs (in particular in spring, fading in autumn). Husk ovoid, 3-20/long raceme. Nut +/- ovoid, 3-6 cm long, smooth or with up to 8 +/- sharp longitudinal ridges.
2. Bud +/- pyramidal, beige to pale brown (leaf scar upper margin emarginated). Husks 5-20/raceme. Nut smooth or ridged. Juglans ailantifolia
2. Bud +/- cylindrical, white to greyish (leaf scar upper margin flat!). Husks 3-5/raceme. Nut ridges razor-sharp (at least initially). Juglans cinerea
Source: Jan De Langhe. The Juglandaceae Vegetative key to the species in Western European cultivation. Ghent University Botanical Garden (24 September 2006, 3 November 2011)
Or this key:
1. Leaf scar with persistent fringe of hairs on upper edge
2. Upper edge of these scar not notched, fringe of hairs conspicuous Juglans cinerea
2. Upper edge of leaf scar notched Juglans ailantifolia
1. Leaf scar without persistent fringe of hairs on upper edge Juglans nigra
Source: Notes on the temperate species of Juglans by John M. Grimshaw
Giant Hogweed (Heracleum mantegazzanium)
Look for this very large wildflower in abandoned fields and on roadsides.
DO NOT TOUCH BEFORE READING LINKS!
Castor Aralia (Kalopanax septemloba)
Look for this tree and its seedlings in forest understory and forest edges and openings.
Perennial Peppergrass (Lepidium latifolium)
Look for this wildflower in the upper margins of salt marshes between the salt grass and the shrubs.
Spotted Loosestrife (Lysimachia punctata)
Look for this wetland wildflower on the borders of lakes and ponds.
Look for this shrub in disturbed forest edges, forests, meadows and fields.
Bog Bulrush (Schoenoplectiella mucronata)
Look for this sedge in disturbed, shallow, open, wet areas.
Look for this floating aquatic plant on the surface of lakes and ponds.
European High Bush Cranberry (Viburnum opulus var. opulus)
Look for this shrub on the borders of wetlands, streams, and in wet forests.
Oriental False Hawksbeard (Youngia japonica)
Look for this wildflower in the understory of woodlands.