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American Pokeweed
09/07/2007
American Pokeweed is a new, non-native invasive plant that could become a big problem in our natural areas unless controlled now.
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Sweet fennel
05/19/2007
Invasive Weed: Sweet fennel (Foeniculum vulgare var
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Lesser Celandine
04/20/2007
Invasive Weed: Lesser celandine (Ranunculus ficaria)
Also known as: fig buttercup
Prohibited nuisance plant in the City of Portland
Threat: Vigorous perennial plant that emerges in mid-February, forming large clumps that prevent native plants from obtaining space and light
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Tree of Heaven
02/21/2007
Tree of Heaven (Ailanthus altissima)
Also known as Chinese sumac, stinking sumac
Prohibited nuisance plant in the cities of Portland and Salem, Oregon
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Yellowflag Iris, Wetland Invader
01/09/2007
Yellow flag Iris (Iris pseudocorus)
Also known as water flag, common iris, yellow iris
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Clematis
11/14/2006
Clematis vitalba
Also known as Old Man’s Beard or Traveler’s Joy
Threat to natural areas: ODA’s Noxious weed list
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Garlic Mustard
03/28/2006
Invasive Weed: Garlic Mustard (Alliaria petiolata)
also known as hedge garlic, sauce-alone, jack-by-the-hedge, poor man's mustard, jack-in-the-bush, garlic root, garlicwort, mustard root
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Japanese Knotweed
03/16/2006
Japanese knotweed (Polygonum cuspidatum)
Also known as: Mexican bamboo, fleeceflower
Oregon Department of Agriculture “B”-listed weed
Threat: Grows very quickly, effectively shading out low-growing herbs and small shrubs
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English Ivy
03/16/2006
English Ivy (Hedera helix)
Listed as a noxious weed and quarantined by the Oregon Department of Agriculture • Four cultivars are listed as noxious weeds by the State of Washington: Hedera helix ‘Baltica’; H
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