F. Key to habitat types

1. Equisetum arvense abundant PICEA ENGELMANNII/EQUISETUN ARVENSE h.t. (p.36) 1. E. arvense not abundant 2

2. Caltha leptosepala common or Trollius laxus well represented PICEA ENGELMANNII/CALTHA LEPTOSEPALA h.t. (p.37) 2. ~. leptosepala scarce and!. laxus poorly represented 3

3. Carex disperma well represented PICEA ENGELMANNII/CAREX DISPERMA h.t. (p.38) 3. ~. disperma poorly represented. 4

4. Calamagrostis canadensis or Ledum glandulosum well represented ABIES LASIOCARPA/CALAMAGROSTIS CANADENSIS h.t. (p.4S) 4a. Ledum glandulosum well represented LEDUM GLANDULOSUM phase* (p.4S) 4b. Not as above; Vaccinium caespitosum common VACCINIUM CAESPITOSUM phase* (p.4S) 4c. Not as above in 4a or 4b CALAMAGROSTIS CANADENSIS phase (p.4S) 4. C. canadensis and L. glandulosum poorly represented 5

5. Streptopus amplexifolius or Senecio triangularis well represented either separately or collectively ABIES LASIOCARPA/STREPTOPUS AMPLEXIFOLIUS h. t.* (p.46) 5. Not as above 6

6. Menziesia ferruginea well represented ABIES LASIOCARPA/MENZIESIA FERRUGINEA h.t.* (p.47) 6. ~. ferruginea poorly represented 7

7. Actaea rubra common ABIES LASIOCARPA/ACTAEA RUBRA h.t. (p.47) 7. A. rubra scarce 8

8. Physocarpus malvaceus well represented ABIES LASIOCARPA/PHYSOCARPUS ~1ALVACEUS h.t. (p.48) 8. ~. malvaceus poorly represented 9

9. Acer glabrum or Sorbus scopulina well represented either separately or collectively ABIES LASIOCARPA/ACER GLABRUM h.t. (p.48) 9. Not as above . 10

10. Linnaea borealis common ABIES LASIOCARPA/LINNAEA BOREALIS h.t. (p.49) lOa. well represented VACCINIUM SCOPARIl~ phase (p.49) lOb. ~. scoparium poorly represented LINNAEA BOREALIS phase (p.49) 10. L. borealis scarce 11

11. Xerophyllum tenax well represented ABIES LASIOCARPA/XEROPHYLLUM TENAX h.t.* (p.SO) 11. X. tenax poorly represented. 12

12. Vaccinium globulare well represented ABIES LASIOCARPA/VACCINIUM GLOBULARE h.t. (p.sa) 12a. Vaccinium scoparium abundant VACCINIUM SCOPARIL~ phase (p.SO) 12b. V. scoparium not abundant; Pachistimamyrsinites usually present, sites mainly south or east of Snake River Plains (fig. 2) PACHISTlMA MYRSINITES phase (p.SO) 12c. ~. myrsinites absent, sites mainly north or west of Snake River Plains . VACCINIUM GLOBULARE phase (p.Sl) 12. ~. globulare poorly represented 13 13. hitchcockii common ABIES LASIOCARPA/ H.T.* (p.S2) 13. L. hitchcockii scarce. 14

14. Vaccinium scoparium well represented ABIES LASIOCARPA/VACCINIUM SCOPARIUM h.t. (p.S2) 14a. Calamagrostis rubescens well represented CALAMAGROSTIS RUBESCENS phase (p.S2) 14b. ~. rubescens poorly represented; Pinus albicaulis well represented PINUS ALBICAULIS phase (p.S2) 14c. Not as above in 14a or 14b VACCINIUM SCOPARIUM phase (p.S2) 14. V. scoparium poorly represented 15

15. latifolia well represented ABIES LASIOCARPA/ h.t. (p.S3) 15. A. latifolia poorly represented 16

16. Symphoricarpos albus well represented ABIES LASIOCARPA/SYMPHORICARPOS ALBUS h.t. (p.S3) 16. ~. albus poorly represented 17

17. Thalictrum occidentale well represented ABIES LASIOCARPA/THALICTRUM OCCIDENTALE h.t. (p.S4) 17. !. occidentale poorly represented. 18

18. Osmorhiza chilensis or O. depauperata well represented either separately or collectiv;ly . ABIES LASIOCARPA/OSMORHIZA CHILENSIS h.t. (p.S4) 18a. Pachistima myrsinites well represented PACHISTlMA MYRSINITES phase (p. SS) 18b. ~. myrsinites poorly represented OSMORHIZA CHILENSIS phase (p. SS) 18. Not as above 19

19. Spiraea betulifolia well represented ABIES LASIOCARPA/SPlRAEA BETULIFOLIA h. t. (p. S6) 19. S. betulifolia poorly represented. 20

20. Calamagrostis rubescens well represented ABIES LASIOCARPA/CALAMAGROSTIS RUBESCENS h.t. (p. S~ 20a. Pachistima myrsinites well represented PACHISTlMA MYRSINITES phase (p. S~ 20b. ~. myrsinites poorly represented CALM1AGROSTIS RUBESCENS phase (p. S7) 20. ~. rubescens poorly represented 21

21. Beberis repens common or Pachistima myrsinites well represented ABIES LASIOCARPA/BERBERIS REPENS h.t. (p.SS) 2la. Carex geyeri well represented CAREX GEYERI phase* (P.59) 2lb. ~. geyeri poorly represented. BERBERIS REPENS phase (p.S9) 21. B. repens scarce and ~. myrsinites poorly represented 22

22. Carex geyeri well represented ABIES LASIOCARPA/CAREX GEYERI h.t.* (p.S9) 22. ~. geyeri poorly represented 23

23. Juniperus communis well represented ABIES LASIOCARPA/JUNIPERUS COMMUNIS h.t. (p.S9) 23. ~. communis poorly represented . 24

24. Ribes montigenum well represented or the dominant of normally depauperate undergrowths ABIES LASIOCARPA/RIBES MONTIGENUM h.t. (p.60) 24a. Pinus albicaulis well represented PINUS ALBICAULIS phase (p.60) 24b. P. albicaulis poorly represented RIBES MONTIGENUM phase (p.60) 24. Not as above 25

25. Pedicularis racemosa common ABIES LASIOCARPA/PEDICULARIS RACEMOSA h.t. (p.60) 25. P. racemosa scarce. 26

26. , Astragalus miser, or Shepherdia canadensis well represented or the dominant undergrowth species ABIES LASIOCARPA/ARNICA CORDIFOLIA h.t. (p.61) 26a. Picea engelmannii abundant PICEA ENGELMANNII phase (p.62) 26b. ~. engelmannii not abundant; Shepherdia canadensis well represented SHEPHERDIA CANADENSIS phase (p.62) 26c. Not as above in 26a or 26b; Astragalus miser common ASTRAGALUS MISER phase (p.62) 26d. Not as above in 26a, 26b or 26c ARNICA CORDIFOLIA phase (p.6S) 26. Not as above in 26; Carex rossii well represented or the dominant undergrowth species . ABIES LASIOCARPA/CAREX ROSSII h.t. (p.65)

*H.t.s and phases incidental to study area and omitted from charts and tables.