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.

• 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.

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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