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  Rydberg: 
  Phytogeographical 
  notes 
  

  

  c. 
  Endemic 
  

  

  Stipa 
  Porter 
  i^ 
  Atelophragma 
  Macounii 
  

  

  J 
  

  

  Stipa 
  Richardsonii 
  AragaUtis 
  Richardsonii 
  

  

  Calamagrostis 
  Scrihneri 
  Hedysartim 
  horeale 
  

  

  Poa 
  tricholepis\ 
  Viola 
  scopulorum 
  , 
  

  

  Anticlea 
  coloradensis\ 
  Osmorrhiza 
  intermedia 
  

  

  Disponim 
  trachycarpjim 
  Primula 
  Parryi 
  

  

  Tratitvetteria 
  media\ 
  Androsace 
  pinetorum\ 
  

  

  Atragene 
  tenuiloha 
  Pentstemon 
  sectindiflorus\ 
  

  

  Actaea 
  viridiflora\ 
  Pentstemon 
  virens\ 
  

  

  Ozomelis 
  stenopetala] 
  Erigeron 
  snperhns^ 
  

  

  Ozomelis 
  Parryi\ 
  AnaphaUs 
  suhalpina 
  

  

  Drymocallis 
  fissa 
  Arnica 
  ptimila 
  

  

  Thermopsis 
  pinetorum\ 
  Arnica 
  sylvatica\ 
  

  

  Thermopsis 
  diversicarpa] 
  Notholaena 
  Fendleri'\ 
  

  

  Atelophragma 
  aboriginum 
  Selaginella 
  Underwoodii^ 
  

  

  II. 
  SPRUCE 
  FOREST 
  

  

  This 
  IS 
  mostly 
  confined 
  to 
  the 
  north 
  slopes 
  of 
  the 
  mountains, 
  

   which 
  are 
  much 
  cooler 
  and 
  moister 
  than 
  the 
  south 
  slopes. 
  As 
  m 
  

   the 
  Subalpine 
  Zone, 
  the 
  principal 
  tree 
  is 
  the 
  Englemann 
  spruce, 
  

   Picea 
  Engelmannii. 
  In 
  some 
  places 
  this 
  forms 
  pure 
  stands 
  but 
  

   usually 
  it 
  is 
  mixed 
  with 
  the 
  balsam 
  fir, 
  Abies 
  concolor, 
  the 
  Colorado 
  

   blue 
  spruce, 
  Picea 
  Parryana^ 
  and 
  the 
  Douglas 
  fir, 
  Pseiidotstiga 
  

   mncronala; 
  and, 
  in 
  the 
  northern 
  part, 
  sometimes 
  with 
  the 
  lodge- 
  

   pole 
  pine, 
  Piniis 
  Murrayana, 
  The 
  undergrowth 
  is 
  much 
  the 
  same 
  

   as 
  in 
  the 
  Pine 
  Forest, 
  and 
  no 
  attempt 
  has 
  been 
  made 
  to 
  distinguish 
  

   the 
  undergrowth 
  of 
  the 
  Pine 
  Forest 
  from 
  that 
  of 
  the 
  Spruce 
  Forest. 
  

  

  III. 
  ASPEN 
  GROVES 
  

  

  These 
  are 
  found 
  on 
  richer 
  more 
  gentle 
  slopes, 
  both 
  on 
  the 
  

   south 
  and 
  the 
  north 
  side 
  of 
  the 
  mountains, 
  but 
  on 
  the 
  former 
  only 
  

   where 
  there 
  is 
  a 
  certain 
  amount 
  of 
  moisture. 
  The 
  principal 
  tree 
  

   is 
  the 
  quaking 
  aspen, 
  Popidus 
  tremaloides, 
  which 
  I 
  count 
  as 
  a 
  

  

  pp 
  

  

  transcontinental 
  tree, 
  as 
  the 
  western 
  form, 
  P, 
  aurea 
  Tidestrom, 
  

   IS 
  so 
  closely 
  related 
  to 
  the 
  eastern. 
  The 
  trees 
  of 
  the 
  southern 
  

   Rockies 
  belong 
  evidently 
  to 
  the 
  latter, 
  but 
  in 
  the 
  Northern 
  Rockies 
  

  

  r 
  

  

  it 
  is 
  unknown 
  where 
  the 
  range 
  of 
  one 
  ends 
  and 
  that 
  of 
  the 
  other 
  

   begins. 
  The 
  vegetation 
  consists 
  mainly 
  of 
  the 
  following 
  plants: 
  

  

  