New Weed Alerts
dwarf mistletoe
Here is a weed (a flowering plant!) that weakens and kills trees.  Dwarf mistletoe.  Photo by T. Breitenfeldt, Spokane County, WA, 2005.
common crupina  (Crupina vulgaris)
plumeless thistle, Carduus acanthoides, (Asteraceae).   Photos.   [version 2]
musk thistle, Carduus nutans, (Asteraceae). More photos.  This weed has been around a long time.
black henbane, Hyoscyamus niger, (Solanaceae).  Photos only.
scotch thistle, Onopordum acanthium. (Asteraceae). Photos only.  Slow download.
common cuckelbur, Xanthium strumarium. (Asteraceae).  Photos.
perennial sowthistle, Sonchus arvensis. (Asteraceae). Photos only.
Italian thistle Carduus pycnocephalus
poison ivy Toxicodendron radicans
blueweed (viper's bugloss) Echium vulgare 
Puncturevine Tebulus terrestris  
European Buckthorn  Rhombus cathartica  
Dwarf snapdragon    Chaenorrhinum minus    [Version 2]  
baby's breath Gypsophila paniculata
flowering rush Butomus umbellamus 
Russian olive Elaeagnus angustifolia  
Poison hemlock   Conium maculatum  

DIRTY DOZEN 
Common Name 
Scientific Name 
MT Noxious Status 
Oxeye daisy  Chysanthemum leucanthemum
Category 1
Houndstongue Cynoglossum officinale
Category 1
Common tansy Tanacetum vulgare
Category 1
Dyers woad  Isatis tinctoria
Category 2
Purple loosestrife  Lythrum salicaria
Category 2
Tansy ragwort Senecio jacobaea
Category 2
Yellow starthistle  Centaurea solstitialis
Category 3
Rush skeletonweed Cholndrilla juncea
Category 3
Absinth wormwood Artemisia absinthium
Not Listed 
Poison hemlock Conium maculatum
Not Listed 
Scotch broom Cytisus scoparius
Not Listed
Common teasel Dipsacus fullonum
Not Listed 

NEW INVADERS ALERT LIST
Common Name
Scientific Name
MT Noxious Status 
Velvetleaf  Abutilon theophrasti
Not Listed
Jointed goatgrass Aegilops cylindrica
Not Listed
Bishop's goutweed  Aegopodium podagraria
Not Listed
Small bugloss Anchusa arvensis
Not Listed
Common bugloss Anchusa officinalis 
Not Listed
Weedy orache  Atriplex heterosperma
Not Listed
White bryony  Bryonia alba
Watch List
Flowering rush  Butomus umbellatus
Not Listed
Plumeless thistle Carduus acanthoides
Not Lised
Dwarf snapdragon  Chaenorrhinum minus
Not Lised
Trailing crownvetch  Coronilla varia
Not Listed
Sand rocket  Diplotaxis muralis
Not Listed
Blueweed  Echium vulgare
Not Listed
Russian olive  Elaeagnus angustifolia
Not Listed
Babysbreath Gypsophila paniculata
Not Listed
Orange hawkweed Hieracium aurantiacum
Category 2
meadow hawkweed complex 
Meadow hawkweed 
Yellow-devil hawkweed 
Kingdevil hawkweed		 Hieracium pratamse
H. floribundum
H. piloselloides
Category 2 
Category 2 
Category 2
Yellowflag  iris  Iris pseudacorus
Not Listed
Bluebuttons Knautia arvensis
Not Listed
Perennial pepperweed Lepidium latifolium
Not Listed
Malcolm stock Malcolmia africana
Not Listed
Scentless chamomile  Matricaria maritima
Watch List
Scotch thistle  Onopordum acanthium
Not Listed
Japanese knotweed  Polygonum cuspidatum
Not Listed
Cultivated knotweed  Polygonum polystachyum
Not Listed
Giant (Sakhalin) Knotweed  Polygonum sachalinense
Not Listed
European  buckthorn Rhamnus cathartica
Not listed
Self salsify  Scorzonera laciniata
Not Listed
Puncturevine  Tribulus terrestris
Not Listed
Table From: Blackfoot Drainage New Weeds Risk Assessment
Updated By: Cotton and Chase Holt     1/7/02
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