Alaska Weed Ranking Project

Non-native species PRESENT in Alaska that were ranked

Species Biography

Risk Assessment Report

Scientific Name

Common Name

Rank
0-100
(low-high)

Climate similarity of Alaska ecogeographic regions and areas where the species occurs

South Coastal

Interior Boreal

Arctic Alpine

ACPT-bio

ACPT-rank

Achillea ptarmica L.

sneezewort

46

Yes

Yes

Yes

ALPE-bio

ALPE-rank

Alliara petiolata (Bieb.) Cavara & Grande

garlic mustard

70

Yes

No

No

ANCO-bio

ANCO-rank

Anthemis cotula L.

Mayweed chamomile, dog fennel

41

Yes

Yes

No

BRIN-bio

BRIN-rank

Bromus inermis ssp. inermis Leyss.

smooth brome

62

Yes

Yes

Yes

BRTE-bio

BRTE-rank

Bromus tectorum L.

cheatgrass

78

Yes

Yes

Yes

CARA-bio

CARA-rank

Campanula rapunculoides L.

Creeping bellflower

64

Yes

Yes

Yes

CABU-bio

CABU-rank

Capsella bursa-pastoris (L.) Medik. L.

shepherd's purse

40

Yes

Yes

Yes

CAAR-bio

CAAR-rank

Caragana arborescens Lam.

Siberian pea shrub

66

No

Yes

Yes

CEBI-bio

CEBI-rank

Centaurea biebersteinii DC

spotted knapweed

86

Yes

Yes

No

CEFO-bio

CEFO-rank

Cerastrium fontanum ssp. vulgare (Hartman) Breuter & Burdert

mouse-ear chickweed

36

Yes

Yes

Yes

CEFO-bio

CEFO-rank

Cerastrium glomeratum Thill.

sticky chickweed

36

Yes

Yes

Yes

CHAL-bio

CHAL-rank

Chenopodium album L.

lambsquarters

37

Yes

Yes

Yes

CIAR4-bio

CIAR4-rank

Cirsium arvense L. Scop.

Canada thistle

76

Yes

Yes

Yes

CIVU-bio

CIVU-rank

Cirsium vulgare (Savi) Ten.

bull thistle, common thistle

61

Yes

Yes

Yes

COAR-bio

COAR-rank

Convulvulus arvensis L.

field bindweed, morning glory

56

Yes

Yes

Yes

COCO7-bio

COCO7-rank

Cotula coronopifolia L.

common brassbuttons

42

Yes

No

No

CRTE-bio

CRTE-rank

Crepis tectorum L.

narrow-leaf hawk's beard

54

Yes

Yes

Yes

CYSC-bio

CYSC-rank

Cytisus scoparius (L.) Link

English broom, Scotch broom

69

Yes

No

No

DAGL-bio

DAGL-rank

Dactylis glomerata L.)

orchardgrass

54

Yes

Yes

Yes

DESO-bio

DESO-rank

Descurainia sophia (L.) Webb ex Prantl.

flixweed

41

Yes

Yes

Yes

DIPU-bio

DIPU-rank

Digitalis purpurea (L.)

purple foxglove

51

Yes

Yes

No

ELRE-bio

ELRE-rank

Elymus repens (L.) Gould

quackgrass, couchgrass, dog grass

59

Yes

Yes

Yes

FACO-bio

FACO-rank

Fallopia convolvulus (L.) Á. Löve. (Polygonum convolvulus L. )

black bindweed

50

Yes

Yes

Yes

POCU-bio

POCU-rank

Fallopia sachalinensis (F. Schmidt) (Polygonum sachalinense F. Schmidt ex Maxim.)

Giant knotweed

87

Yes

Yes

No

POCU-bio

POCU-rank

Fallopia X bohemica(Chrtek & Chrtková) J. P. Bailey, Watsonia.
(Polygonym × bohemicum (J. Chrtek & Chrtkova) Zika &
Jacobson [cuspidatum x sachalinense])

Bohemian knotweed

87

Yes

Yes

No

POCU-bio

POCU-rank

Fallopia japonica (Houttuyn) (Polygonym cuspidatum Sieb. & Zucc.)

Japanese knotweed

87

Yes

Yes

No

GABI-bio

GABI-rank

Galeopsis bifida Boenn. and G. tetrahit L.

split-lip hemp-nettle

40

Yes

Yes

Yes

GLHE-bio

GLHE-rank

Glechoma hederacea L.

ground ivy

48

Yes

Yes

Yes

GYPA-bio

GYPA-rank

Gypsophila paniculata L.

baby's breath

57

Yes

Yes

Yes

HESMAT-bio

HESMAT-rank

Hesperis matronalis L.

dame's rocket

41

Yes

Yes

No

HIAU-bio

HIAU-rank

Hieracium aurantiacum L.

orange hawksweed, devil's paintbrush

79

Yes

Yes

Yes

HICA-bio

HICA-rank

Hieracium caespitosum

meadow hawkweed

79

Yes

Yes

Yes

HIUM-bio

HIUM-rank

Hieracium umbellatum L.

narrow-leaved hawkweed

54

Yes

Yes

Yes

HOJU-bio

HOJU-rank

Hordeum jubatum L.

foxtail barley

63

Yes

Yes

Yes

HOMUL-bio

HOMUL-rank

Hordeum murinum ssp. leporinum (Link) Arcang.

leporinum barley, lepor barley

60

No

Yes

No

HYPE-bio

HYPE-rank

Hypericum perforatum

St. Johnswort

52

Yes

Yes

Yes

IMGL-bio

IMGL-rank

Impatiens glandulifera Royle

ornamental jewelweed

82

Yes

Yes

No

LASQ-bio

LASQ-rank

Lappula squarrosa (Retz.) Dumont.

European stickweed, bristly sheepburr

44

Yes

Yes

Yes

LEDE-bio

LEDE-rank

Lepidium densiflorum var. densiflorum Schrad.

common pepperweed,

25

Yes

Yes

Yes

LEDE-bio

LEDE-rank

L. densiflorum var. elongatum (Rydb.) Thellung.

tall pepperweed

25

Yes

Yes

Yes

LEVU-bio

LEVU-rank

Leucanthemum vulgare Lam.

oxeye daisy, white daisy

61

Yes

Yes

Yes

LIVU-bio

LIVU-rank

Linaria vulgaris Miller

yellow toadflax, butter and eggs

61

Yes

Yes

Yes

LOPEM-bio

LOPEM-rank

Lolium perenne ssp. multiflorum (Lam.) Husnot

annual ryegrass

41

Yes

Yes

Yes

LOTA-bio

LOTA-rank

Lonicera tatarica L.

bush honeysuckle

66

Yes

Yes

No

LUPO-bio

Lupinus polyphyllus-rank

Lupinus polyphyllus Lindl.

bigleaf lupine, marsh lupine

55

Yes

-

-

LYSA-bio

LYSA-rank

Lythrum salicaria L.

purple loosestrife

83

No

Yes

No

LYVI-bio

LYVI-rank

Lythrum virgatum L.

spike loostrife

83

No

Yes

No

MADI-bio

MADI-rank

Matricaria discoidea DC.

disc mayweed, pineappleweed

32

Yes

Yes

Yes

MELU-bio

MELU-rank

Medicago luplina L.

Black medic

48

Yes

Yes

Yes

MESAF-bio

MESAF-rank

Medicago sativa ssp. falcata (L.) Arcang.

Yellow alfalfa

64

Yes

Yes

Yes

MESAS-bio

MESAS-rank

Medicago sativa ssp. sativa L.

Alfalfa

59

Yes

Yes

Yes

MEAL-bio

MEAL-rank

Melilotus alba Medikus

white sweetclover

81

Yes

Yes

Yes

MEOF-bio

MEOF-rank

Melilotus officinalis (L.) Lam

yellow sweetclover, king's crown

69

Yes

Yes

Yes

MYMU-bio

MYMU-rank

Mycelis muralis (L.) Dumort.

wall lettuce

31

Yes

No

No

NYODO-bio

NYODO-rank

Nymphaea odorata ssp. odorata Ait.

white waterlilly

80

Yes

No

No

PHAR-bio

PHAR-rank

Phalaris arundinacea L.

reed canarygrass, canarygrass

83

Yes

Yes

Yes

PHPR-bio

PHPR-rank

Phleum pratense L.

common timothy

54

Yes

Yes

Yes

PLMA-bio

PLMA-rank

Plantago major L.

common plantain

44

Yes

Yes

Yes

POAN-bio

POAN-rank

Poa annua L.

annual bluegrass

46

Yes

Yes

Yes

POCO-bio

POCO-rank

Poa compressa L.

Canada bluegrass

39

Yes

Yes

Yes

POPR-bio

POPR-rank

Poa pratensis L. ssp. pratensis

Kentucky bluegrass

52

Yes

Yes

Yes

POPR-bio

POPR-rank

Poa pratensis ssp. irrigata (Lindm.) (Lindb.f.)

spreading bluegrass

52

Yes

Yes

Yes

POTR1-bio

POTR1-rank

Poa trivalis L.

rough bluegrass

52

Yes

Yes

Yes

POAV-bio

POAV-rank

Polygonum aviculare L.

prostrate knotweed, yard knotweed

45

Yes

Yes

Yes

POPE-bio

POPE-rank

Polygonum persicaria L. (Persicaria maculosa Gray)

spotted ladysthumb

47

Yes

Yes

Yes

POLA-bio

POLA-rank

Polygonum lapathifolium L. or Persicaria lapathifolia (Linnaeus) Gray

curlytop knotweed

47

Yes

Yes

Yes

PRPA-bio

PRPA-rank

Prunus padus L.

European bird cherry

74

Yes

Yes

No

RARE-bio

RARE-rank

Ranunculus repens L.

creeping buttercup

54

Yes

Yes

Yes

RAAC-bio

RAAC-rank

Ranunculis acris L.

tall buttercup

54

Yes

Yes

Yes

RUDI-bio

RUDI-rank

Rubus discolor Weihe & Nees

Himalyan blackberry

77

Yes

No

No

RUAC-bio

RUAC-rank

Rumex acetosella L.

sheep sorrel

51

Yes

Yes

Yes

RUCR-bio

RUCR-rank

Rumex crispus L.

curly dock

48

Yes

Yes

Yes

RUOB-bio

RUOB-rank

Rumex obtusifolius L. and
R. longifolius DC.

curly dock, bitter dock

48

Yes

Yes

Yes

SAOF-bio

SAOF-rank

Saponaria officinalis L.

bouncing-bett

34

-

-

-

SEJA-bio

SEJA-rank

Senecio jacobaea L.

ragwort, stinking willie

63

Yes

Yes

Yes

SEVU-bio

SEVU-rank

Senecio vulgaris L.

common groundsel, old-man-in-the-Spring

35

Yes

Yes

Yes

Silene-bio

Silene-rank

Silene noctiflora L.,

night-flowering catchfly

42

Yes

Yes

Yes

Silene-bio

Silene-rank

Silene latifloila ssp. alba L.

white cockle

42

Yes

Yes

Yes

Silene-bio

Silene-rank

Silene vulgaris (Moench)

bladder campio

42

Yes

Yes

Yes

Silene-bio

Silene-rank

Silene dioica L.

Clairville red catchfly

42

Yes

Yes

Yes

SOAR-bio

SOAR-rank

Sonchus arvensis L. ssp. uliginosus (Bieb.) Nyman

perennial sowthistle, moist sowthistle

72

Yes

Yes

No

SOAU-bio

SOAU-rank

Sorbus aucuparia L.

European mountain ash, rowan

59

Yes

No

No

SPAR-bio

SPAR-rank

Spergula arvensis L.

Corn spurry

32

Yes

Yes

No

STME-bio

STME-rank

Stellaria media L. (Vill.) (disturbed sites)

common chickweed

42

Yes

Yes

Yes

STME-bio

STME-rank

Stellaria media L. (Vill.) (sea bird colonies )

common chickweed

54

Yes

Yes

Yes

TAVU-bio

TAVU-rank

Tanacetum vulgare L.

common tansy, garden tansy

57

Yes

Yes

Yes

TAOF-bio

TAOF-rank

Taraxacum officinale G.H. Weber ex Wigg

common dandelion

58

Yes

Yes

Yes

TRDU-bio

TRDU-rank

Tagopogon dubius Scop.

yellow salsify, goat's bear

50

Yes

Yes

No

TRHY-bio

TRHY-rank

Trifolium hybridum L.

alsike clover

57

Yes

Yes

Yes

TRPR-bio

TRPR-rank

Trifolium pratense L.

red clover

53

Yes

Yes

Yes

TRRE-bio

TRRE-rank

Trifolium repens L.

white clover, ladino clover

59

Yes

Yes

Yes

TRPE-bio

TRPE-rank

Tripleurospermum perforata (Merat) M. Lainz

scentless false mayweed,
scentless chamomile

48

Yes

Yes

Yes

VETH-bio

VETH-rank

Verbascum thapsus L.

common mullein

52

Yes

Yes

No

VICR-bio

VICR-rank

Vicia cracca L.

bird vetch, cow vetch, tufted vetch

73

Yes

Yes

Yes

VIVI-bio

VIVI-rank

Vicia villosa Roth

winter vetch

53

Yes

Yes

No

Non-native species NOT recorded in Alaska and that were ranked, but with a high probability of occurring in Alaska. They have been found in Washington state and neighboring Canadian provinces and territories.

Species Biography

Risk Assessment Report

Scientific Name

Common Name

Rank
0-100
(low-high)

Climate similarity of Alaska ecogeographic regions and areas where the species occurs

South Coastal

Interior Boreal

Arctic Alpine

ALGL-bio

ALGL-rank

Alnus glutinosa (L.) Gaerth.

European alder, black alder

61

Yes

Yes

Yes

BRSY-bio

BRSY-rank

Brachypodium sylvaticum (Huds.) Beauv.

false-brome

70

Yes

Yes

Yes

Carduus-bio

Carduus-rank

Carduus nutans L.

musk thistle

61

Yes

Yes

Yes

Carduus-bio

Carduus-rank

Carduus acanthoides L.

plumeless thistle

61

Yes

Yes

Yes

Carduus-bio

Carduus-rank

Carduus pycnocephalus L.

Italian thistle

61

Yes

Yes

Yes

Carduus-bio

Carduus-rank

Carduus tenuiflorus W. Curtis

slender-flowered thistle

61

Yes

Yes

Yes

CRVU-bio

CRVU-rank

Crupina vulgaris Cass.

common crupina, bearded creaper

rejected from consideration

No

No

No

EUES-bio

EUES-rank

Euphorbia esula L.

leafy spurge

84

Yes

Yes

No

HERMAN-bio

HERMAN-rank

Heracleum mantegazzianum Sommier & Levier

giant hogweed

81

Yes

Yes

Yes

HYVE-bio

HYVE-rank

Hydrilla verticillata ( L. f) Royle

hydrilla

80

Yes

Yes

Yes

LELA-bio

LELA-rank

Lepidium latifolium L.

perennial pepperweed, tall whitetop

72

No

Yes

Yes

LIDA-bio

LIDA-rank

Linaria dalmatica L.

Dalmatian toadflax

58

No

Yes

No

MYSP-bio

MYSP-rank

Myriophyllum spicatum L.

Eurasian watermilfoil

90

Yes

Yes

No

PORE-bio

PORE-rank

Potentilla recta L.

sulphur cinquefoil

57

Yes

Yes

No

SPAL-bio

SPAL-rank

Spartina alterniflora Loisel

Atlantic cordgrass

86

Yes

No

No

SPAL-bio

SPAL-rank

Spartina angelica C.E. Hubbard

saltmarsh grass

86

Yes

No

No

SPAL-bio

SPAL-rank

Spartina densiflora Brongn.,
S. patens (Ait.) Muhls

saltmarsh grass

86

Yes

No

No

SPAL-bio

SPAL-rank

Spartina patens (Ait.) Muhls

smooth cordgrass

86

Yes

No

No

ZOJA-bio

ZOJA-rank

Zostera japonica Aschers. & Graebn.

dwarf eelgrass

53

Yes

Yes

No

Weed Ranking Project
Alaska Natural Heritage Program

Alaska's Most Wanted Invasive Species

Centaurea stoebe,
spotted knapweed,
invasive rank score 86

Lythrum salicaria,
purple loosestrife,
invasive rank score 83

Melilotus alba,
White sweetclover,
invasive rank score 80

Hieracium caespitosum,
meadow hawkweed,
invasive rank score 79

Bromus tectorum,
cheatgrass,
invasive rank score 78

Cirsium arvense,
Canada thistle,
invasive rank score 76

Prunus padus,
European bird cherry,
invasive rank score 74

Vicia cracca
bird vetch 73

Caragana arborescens,
Siberian pea shrub,
invasive rank score 66

Bromus inermis ssp. inermis,
smooth brome,
invasive rank score 62

Phleum pratense,
common timothy,
invasive rank score 54

Species Biography

Risk Assessment Report

Scientific Name

Common Name

Rank
0-100
(low-high)

Climate similarity of Alaska ecogeographic regions and areas where the species occurs

South Coastal

Interior Boreal

Arctic Alpine

Species Biography

Risk Assessment Report

Scientific Name

Common Name

Rank
0-100
(low-high)

Climate similarity of Alaska ecogeographic regions and areas where the species occurs

South Coastal

Interior Boreal

Arctic Alpine

Weed Ranking Project Alaska Natural Heritage Program

Alaska's Most Wanted Invasive Species

Centaurea stoebe, spotted knapweed, invasive rank score 86

Lythrum salicaria, purple loosestrife, invasive rank score 83

Melilotus alba, White sweetclover, invasive rank score 80

Hieracium caespitosum, meadow hawkweed, invasive rank score 79

Bromus tectorum, cheatgrass, invasive rank score 78

Cirsium arvense, Canada thistle, invasive rank score 76

Prunus padus, European bird cherry, invasive rank score 74

Vicia cracca bird vetch 73

Caragana arborescens, Siberian pea shrub, invasive rank score 66

Bromus inermis ssp. inermis, smooth brome, invasive rank score 62

Phleum pratense, common timothy, invasive rank score 54

Species Biography

Risk Assessment Report

Scientific Name

Common Name

Rank 0-100 (low-high)

Climate similarity of Alaska ecogeographic regions and areas where the species occurs

South Coastal

Interior Boreal

Arctic Alpine

Species Biography

Risk Assessment Report

Scientific Name

Common Name

Rank 0-100 (low-high)

Climate similarity of Alaska ecogeographic regions and areas where the species occurs

South Coastal

Interior Boreal

Arctic Alpine

Weed Ranking Project
Alaska Natural Heritage Program

Centaurea stoebe,
spotted knapweed,
invasive rank score 86

Lythrum salicaria,
purple loosestrife,
invasive rank score 83

Melilotus alba,
White sweetclover,
invasive rank score 80

Hieracium caespitosum,
meadow hawkweed,
invasive rank score 79

Bromus tectorum,
cheatgrass,
invasive rank score 78

Cirsium arvense,
Canada thistle,
invasive rank score 76

Prunus padus,
European bird cherry,
invasive rank score 74

Vicia cracca
bird vetch 73

Caragana arborescens,
Siberian pea shrub,
invasive rank score 66

Bromus inermis ssp. inermis,
smooth brome,
invasive rank score 62

Phleum pratense,
common timothy,
invasive rank score 54

Rank
0-100
(low-high)

Rank
0-100
(low-high)