﻿442 
  Rydberg: 
  Phytogeographical 
  notes 
  

  

  belong 
  principally 
  to 
  the 
  foothills. 
  The 
  following 
  wooded 
  for- 
  

   mations 
  may 
  be 
  distinguished, 
  though 
  elements 
  of 
  two 
  or 
  more 
  

   are 
  often 
  mixed. 
  

  

  L 
  PINE 
  FOREST 
  

  

  m 
  

  

  This 
  consists 
  mostly 
  of 
  a 
  mixture 
  of 
  Pmus 
  scopulortim, 
  Aptnus 
  

   flexilis 
  and 
  Pseudotsnga 
  mucronata. 
  In 
  some 
  places, 
  however, 
  

   one 
  or 
  another 
  of 
  these 
  species 
  is 
  predominant. 
  This 
  formation 
  

   is 
  limited 
  mostly 
  to 
  the 
  south 
  slopes 
  of 
  the 
  mountains, 
  which 
  are 
  

   drier 
  and 
  hotter 
  and 
  where 
  the 
  soil 
  is 
  rather 
  poor. 
  

  

  The 
  last 
  one 
  of 
  the 
  three 
  species 
  mentioned 
  seems 
  to 
  be 
  more 
  

   indifferent, 
  however, 
  to 
  soil 
  and 
  moisture 
  than 
  the 
  others, 
  being 
  

   found 
  on 
  the 
  north 
  as 
  well 
  as 
  on 
  the 
  south 
  slopes 
  and 
  associating 
  

   with 
  the 
  pines 
  as 
  well 
  as 
  with 
  the 
  spruces, 
  balsams, 
  and 
  aspens. 
  

   To 
  the 
  three 
  species 
  are 
  added 
  in 
  the 
  northern 
  part 
  of 
  the 
  Southern 
  

   Rockies 
  the 
  lodge-pole 
  pine, 
  Pinus 
  Murray 
  ana. 
  In 
  some 
  places 
  

   this 
  forms 
  pure 
  stands, 
  especially 
  on 
  burnt 
  over 
  areas, 
  'since 
  it 
  

   germinates 
  readily 
  and 
  is 
  quick 
  in 
  its 
  growth. 
  

  

  Of 
  the 
  trees 
  belonging 
  to 
  this 
  formation, 
  none 
  is 
  transcontinen- 
  

   tal 
  or 
  common 
  to 
  the 
  Rockies 
  and 
  the 
  Eastern 
  Canadian 
  Zone, 
  

   three 
  are 
  common 
  to 
  the 
  Rockies 
  and 
  the 
  Pacific 
  Highlands 
  and 
  

   one 
  is 
  endemic. 
  Among 
  the 
  shrubs 
  and 
  herbs 
  all 
  four 
  categories 
  

   are 
  found. 
  As 
  the 
  transcontinentals 
  and 
  the 
  eastern 
  plants 
  act 
  

   much 
  the 
  same 
  they 
  will 
  be 
  treated 
  together 
  as 
  an 
  eastern 
  element. 
  

   Those 
  marked 
  '*t'' 
  ^^^ 
  found 
  in 
  the 
  Southern 
  Rockies 
  only, 
  not 
  

   in 
  the 
  Northern. 
  The 
  nomenclature 
  throughout 
  follows 
  the 
  

   writer's 
  ''Flora 
  of 
  the 
  Rocky 
  Mountains 
  and 
  Adjacent 
  Plains, 
  

   New 
  York, 
  1917. 
  

  

  I. 
  Trees 
  

  

  ■ 
  X 
  

  

  r 
  

  

  a. 
  Western 
  

  

  Pinus 
  Murrayana 
  Pseudotsnga 
  mucronata 
  

  

  Apinus 
  flexilis 
  

  

  M 
  

  

  Pinus 
  scopulorum 
  

  

  &. 
  Endemic 
  

  

  2. 
  Shrubs 
  

  

  a. 
  Eastern 
  or 
  transcontinental 
  

   Rubus 
  pubescens 
  Lepargyraea 
  canadensis 
  

  

  