Invasiveness Ranking System for Non-Native Plants of Alaska

Appendix A.2.Summary Scores Of Invasiveness RankingOf 113 Non-native Plants Ordered By Species NameEcologicalImpactBiologicalCharacteristicsPlant speciesCommon nameAchillea ptarmica Sneezeweed 14 12 15 2(3) 43(93) 46 Yes Yes YesAlliaria petiolata Garlic mustard 24(30) 16 16 7 63(90) 70 Yes – –Alnus glutinosa † European alder 24 16 14 5 59(97) 61 Yes Yes YesAnthemis cotula Stinking chamomile 8 12 14 7 41 41 Yes Yes –Brachypodium sylvaticum † False slender brome 31 19(23) 14 5 69(98) 70 Yes Yes YesBromus inermis ssp. inermis Smooth brome 20 16 18 8 62 62 Yes Yes YesBromus tectorum Cheatgrass 34 15 23 6 78 78 Yes Yes YesCampanula rapunculoides Rampion bellflower 18(40) 16(20) 20(25) 5(7) 59(92) 64 Yes Yes YesCapsella bursa-pastoris Shepherd’s purse 7 11 18 4 40 40 Yes Yes YesCaragana arborescens Siberian peashrub 24 14 21 5(7) 64(97) 66 – Yes YesCarduus acanthoides * † Spiny plumeless thistle 22 17 14 8 61 61 Yes Yes YesCarduus nutans * † Nodding plumeless thistle 22 17 14 8 61 61 Yes Yes YesCarduus pycnocephalus * † Italian plumeless thistle 22 17 14 8 61 61 Yes Yes YesCarduus tenuiflorus * † Winged plumeless thistle 22 17 14 8 61 61 Yes Yes YesCentaurea biebersteinii Spotted knapweed 34 22 21 9 86 86 Yes Yes –Centaurea solstitialis Yellow star-thistle – – –Cerastium fontanum ssp. vulgare * Big chickweed 6 8(25) 15(19) 5 34(94) 36 Yes Yes YesCerastium glomeratum * Sticky chickweed 6 8(25) 15(19) 5 34(94) 36 Yes Yes YesChenopodium album Lambsquarters 5 12 15 5 37 37 Yes Yes YesCirsium arvense Canada thistle 26 17 21 10 76 76 Yes Yes YesCirsium vulgare Bull thistle 20 19(23) 18 3 60(98) 61 Yes Yes YesConvolvulus arvensis Field bindweed 18 14 16 8 56 56 Yes Yes YesCotula coronopifolia Common brassbuttons 14 11(23) 9 7 41(98) 42 Yes – –Crepis tectorum Narrowleaf hawksbeard 9(30) 17 18 3(7) 47(87) 54 Yes Yes YesCrupina vulgaris Common crupina – – –Cytisus scoparius Scotch broom 26 17 18 8 69 69 Yes – –Dactylis glomerata Orchard grass 16 10 22 5 53 53 Yes Yes YesDescurainia sophia Herb sophia 8 13 18 2 41 41 Yes Yes YesDigitalis purpurea Purple foxglove 16 11 19 5 51 51 Yes Yes –Elymus repens Quackgrass 20 15 19 5 59 59 Yes Yes YesEuphorbia esula † Leafy spurge 31 21 23 9 84 84 Yes Yes –Fallopia convolvulus Black bindweed 12 16 17 5 50 50 Yes Yes YesGaleopsis bifida * splitlip hempnettle 14 9 12(19) 3 38(94) 40 Yes Yes YesGaleopsis tetrahit * brittlestem hempnettle 14 9 12(19) 3 38(94) 40 Yes Yes YesGlechoma hederacea Ground ivy 14 12 14 8 48 48 Yes Yes YesGypsophila paniculata Baby’s breath 20 14 18 3(7) 55(97) 57 Yes Yes YesHeracleum mantegazzianum † Giant hogweed 33 22 17 9 81 81 Yes Yes YesHesperis matronalis Dames rocket 10 10(22) 17 2(7) 39(94) 41 Yes Yes –† = Not known in AK (2006)* = Congeneric species ranked together1 Invasiveness is equal to the Relative Maximum Score, which is equal to the sum of scores from each section divided by the total possible. See pages 10–11.Climate matches to the three ecoregions of Alaska are included (Yes = present or high probability of establishing in the ecoregion, – = absent and low probabilityof establishment). Scores >80 = “Extremely Invasive”, 70-79 = “Highly Invasive”, 60-69 = “Moderately Invasive”, 50-59 = “Modestly Invasive”, 40-49 = “WeaklyInvasive”, and < 40 = “Very Weakly Invasive”.DistributionControlTotalInvasiveness1South CoastalInterior BorealArctic AlpineA-4