* Red Alert species: Species not yet established in Maryland but considered to be of high risk.
Key Code	Scientific Name	Common Name	Details
2	Acer platanoides	Norway Maple
2, 3	Ailanthus altissima	Tree of Heaven
2	Alliaria petiolata	Garlic Mustard
1, 3	Allium vineale	Wild Garlic
2, 3	Ampelopsis brevipedunculata	Porcelain Berry
2, 3	Artemisia vulgaris	Mugwort
2	Berberis thunbergii	Japanese Barberry
1, 2, 3	Carduus acanthoides	Plumeless Thistle
1, 2, 3	Carduus nutans	Musk Thistle
2	Celastrus orbiculatus	Oriental Bittersweet
2	Centaurea maculosa	Spotted Knapweed
1, 2, 3	Cirsium arvense	Canada Thistle
1, 2, 3	Cirsium vulgare	Bull Thistle
2	Elaeagnus umbellata	Autumn Olive
2	Hedera helix	English Ivy
2	Hemerocallis fulva	Daylily
1, 4	Heracleum mantegazzianum	Giant Hogweed
2	Humulus japonicus	Japanese Hops
2	Lonicera japonica	Japanese Honeysuckle
2	Lonicera maackii	Amur Honeysuckle
2	Lonicera morrowi	Morrow's Honeysuckle
2	Lonicera tatarica	Tartarian Honeysuckle
1, 2	Lythrum salicaria	Purple Loosestrife
2	Microstegium vimineum	Japanese Stiltgrass
2	Miscanthus sinensis	Eulalia
2, 3	Perilla frutescens	Perilla
1, 2, 3	Phragmites australis	Phragmites
2	Polygonum cuspidatum	Japanese Knotweed
2	Polygonum perfoliatum	Mile-a-minute
2, 3	Pueraria montana var.lobata	Kudzu
2, 3	Pyrus calleryana 'Bradford'	Callery/Bradford Pear
2, 3	Ranunculus ficaria	Lesser Celandine
2, 3	Rosa multiflora	Multiflora Rose
1, 3	Sorghum bicolor	Shattercane
1, 2, 3	Sorghum halepense	Johnsongrass