Table 7 — Relative resistance, resilience, and tolerance of species in 

 Washington's Cascade Mountains 



Species Resistance^ Resilience^ Tolerance^ 



Shrubs 



Pachistima myrsinites {^Y h I I 



Phyllodoce empetriformis (3) h II 



Vaccinium membranaceum (3) m I I 



Vaccinium scoparium (3,4) m I I 



Graminoids 



Carex nigricans (2) h m h 



Carex spectabilis (2,4) m-h m-h m-h 



Juncus drummondii (2) m m m 



Luzula hitchcockii (2,4) m-h m m-h 



Forbs 



Antennaria lanata (2) m m m 



Arnica mollis (3,4) I l-m l-m 



Aster alpigenus (3,4) l-m m l-m 



Caltha bicolor (4) I I I 



Equisetum palustre (4) I mm 



Erigeron peregrinus (3,4) m m l-m 



Heracleum lanatum (4) I h h 



Hieracium gracile (2) m m m 



Leptarrhena pyrolifolia (3,4) m-h h h 



Ligusticum grayi (3,4) I rn-h m-h 



Lupinus polyphyllus (4) I mm 



Mitella breweri (4) m m m 



Osmorhiza purpurea (4) I ml 



Parnassia fimbriata (4) III 



Pedicularis bracteosa (4) I II 



Potentilla flabellifolia (2,3,4) l-m m-h m 



Saxifraga arguta (4) I m m 



Senecio triangularis (4) I mm 



Thalictrum occidentale (4) I mm 



Trollius laxus (4) I ml 



Valeriana sitchensis (4) I mm 



Veratrum viride (4) I h h 



Veronica cusickii (2) m m h 



Viola glabella (4) I m I 



Viola orbiculata (4) m m m 



Other 



Abies lasiocarpa seedling (3) I II 



Mosses (2,3,4) m-h m-h m-h 



'Resistance classes are based on the minimum number of passes that reduced cover 

 by 50 percent; h > 500 passes; m = 200 passes; I < 75 passes. 



^Resilience classes are based on recovery after cover was reduced nearly to zero: 

 h = cover 1 year after trampling was more than two-thirds of the original cover; m = cover 

 1 year after trampling was between one-third and two-thirds of original cover; I = cover 

 1 year after trampling was less than one-third of original cover. 



^Tolerance classes are based on the maximum number of passes that could be toler- 

 ated and still have at least 75 percent of original cover 1 year after trampling: h > 500 

 passes; m = 200 passes; I < 75 passes. 



"Vegetation types: 1 = Pachistima myrsinites; 2 = Carex nigricans; 3 = Phyllodoce 

 empetriformis; 4 = Valeriana sitchensis. 



15 



