64 



NORTH AMERICAN FAUXA. 



[NO. 16. 



PLANTS ()!•' CANADIAX ZONK — ColltiinU'd. 



(1) Species kiwwii to occur in Cunadian zone on Sluisla — Continued. 



Spirn-a (loiij^lasi. 

 Spraguea uinlielhita. 

 Stacliys ingrata. 

 Stellaria crispa. 

 Toticldia occidt'iitalis. 



Tritelia ixioides. 

 A'accininni oi'oidcntale. 

 Vagnera stellata. 

 Veratnuu <alifornicnm. 

 Viola blanda. 



(2) SpecitH restricted to Canadian ;one. 



Abies sliastensis. 

 Aconitiini coluinbiaimin. 

 Allium validum. 

 Alnus siuuata. 

 Arnica longifolia. 

 ?Coranorbiza bigelovi. 

 Deljibininm sonnei. 

 Drosora lotundifolia. 

 Erigerou iuornatus. 

 Gentiana simplex. 

 Ilabenaria leucostacliys. 

 Habenaiia unalascbensis. 



Lilium ]>arvum. 

 Madia bolanderi. 

 Pentstemon denstus. 

 Pentstemon gracilentus. 

 Pinus monticola. 

 Pinus murrayana. 

 Pyrola pallida. 

 Seuecio trigouophyllus. 

 Tofieldia occideutalis. 

 A'accinium occidentale. 

 Viola blanda. 



(3) Species cotnmon to Canadian and Transition zones. 

 [See p. 61.] 



(4) Species common to Canadian and llndsonian zones. 



Arctostapbylos nevadensis. 

 Campanula wilkinsiana. 

 Castanopsis semi)eivirena. 

 Castilleja miniata. 

 Cbrysothamuus bloomeri. 

 Holodiscns discolor. 

 Hypericum anagalloidcs. 



Ligusticum gray!. 

 Miunilus primnloide.s. 

 Monardella odoratissima. 

 Pblox donglasi ditlusa. 

 Ribes cereum. 

 Spraguea umbellata. 

 Stellaria crispa. 



HTDSONIAN ZO^'E. 



The lliulsoniaii zone is the liighest of tlie timber l>elts. Its sinuous 

 upper border lises on the liigh ridges to in(;lose the narrow tongues of 

 dwarf prostrate trees that push up ou the warmest southwesterly expo- 

 sures to an extreme altitude of 9,800 feet, but between the ridges it 

 dips down a thousand feet or more, and is diflieult to fix with i)reeision. 

 The lower border slightly overlaps the upper limit of Shasta lirs. Two 

 sjjeeies of trees, and only two, grow in tliis zone — the black alpine hem- 

 lock [TsHtja mertensiana) and the white bark pine {Piitu.s alhicaulis). 

 The hemlock is restricted to local spots, while the white-bark pine forms 

 a i)ractically continuous belt, as already explained (see i). 42). Ou 

 warm southwesterly slopes the Hudsonian reaches from 7,500 or 7,800 

 up to M,.">00, or in extreme cases to 0,800 feet. 



