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Blackfoot Drainage New Weeds Risk Assessment

Alert List

The Alert List includes 32 species that have been reported from the Blackfoot River counties of Missoula and Powell or their nine immediately surrounding counties, and ratings of potential to become significant weeds in six environmental types.

The environmental types are:

  • Agriculture - hay fields, permanent pastures, cultivated land
  • Grassland - valley or montane grassland and shrubland habitat types
  • Forest - sites capable of supporting forest vegetation, including cleared timber units and other open-canopy forest sites
  • Riparian - terrestrial zones adjacent to streams and lakes, and wet shore areas
  • Wetland - marshes, wet meadows and shallow ponds
  • Disturbed areas - roadsides, ditch banks, waste places, etc.
The ratings are:
  • High - the species has high potential to become an important weed in this environment within the Blackfoot River drainage.
  • Possible - initial indications are that the species could become a weed of this environment, but current information is limited for specific conditions within the Blackfoot drainage.  Further analysis may be warranted.
  • Limited - the species is not expected to affect extensive areas of the Blackfoot drainage in the near future, but could become a localized weed under certain conditions
  • Uncertain - current information is inadequate to assess risk.  Further analysis may be warranted.
* An asterisk following the common name indicates species which grow primarily as annuals

Note: The "more info" column has the following links:
    - brief text summaries for each species
    - distribution data (executes a query on the INVADERS Database)
    - a list of related links on the web
    - a list of related links with pictures on the web
 
 

Alert List for Recently Invading or Less Well Known Weeds and Risk Ratings for Blackfoot Drainage Environments
species common 
name
agricul- 
ture
grassland forest riparian wetland disturbed 
areas
more 
info
Abutilon   
theophrasti
velvetleaf* possible possible possible     high
Aegilops  
cylindrica
jointed 
goatgrass*
possible possible       high
Aegopodium 
podagraria
bishop's 
goutweed
uncertain
Anchusa 
arvensis
small 
bugloss*
possible possible possible     high
Anchusa 
officinalis
common 
bugloss
possible possible possible     high
Atriplex 
heterosperma
weedy 
orache*
uncertain
Bryonia 
alba
white  
bryony
    possible possible    possible
 
Butomus 
umbellatus
flowering 
rush
possible     high high high
Carduus 
acanthoides
plumeless 
thistle
high high possible high   high
Chaenorrhinum 
minus
dwarf 
snapdragon*
possible possible possible     high
Coronilla 
varia
trailing crownvetch possible possible possible possible   high
Diplotaxis 
muralis
sand rocket uncertain
Echium 
vulgare
blueweed possible possible possible     high
Elaeagnus 
angustifolia
Russian 
olive
      limited limited  
Gypsophila 
paniculata
babys- 
breath
possible possible possible possible   high
Hieracium 
aurantiacum
orange 
hawkweed
    high     high
1. Hieracium 
    pratense, 
2. Hieracium 
    floribundum, 
3. Hieracium 
    piloselloides
meadow, 
yellowdevil, 
kingdevil 
hawkweeds 
(yellow- 
flowered 
hawkweed 
complex)
    high     high
1.
2.
3.
Iris 
pseudacorus
yellowflag 
iris
      high high high
Knautia 
arvensis
bluebuttons possible possible possible     high
Lepidium 
latifolium
perennial 
pepperweed
high possible possible high possible high
Malcolmia 
africana
malcolm 
stock*
possible possible       high
Matricaria 
maritima
scentless 
chamomile
high possible   possible   high
Onopordum 
acanthium
Scotch 
thistle
high high high high   high
Polygonum 
cuspidatum
Japanese 
knotweed
possible     high   high
Polygonum 
polystachyum
cultivated
knotweed
possible     high   high
Polygonum 
sachalinense
sakhalin 
knotweed
possible     high   high
Rhamnus 
cathartica
European 
buckthorn
limited   limited limited   limited
Scorzonera 
laciniata
self 
salsify*
uncertain
Tribulus 
terrestris
puncturevine possible possible possible     high
Zygophyllum 
fabago
syrian 
beancaper
possible possible       high
 

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