﻿1890.] 
  BOTANICAL 
  GAZETTE. 
  II3 
  

  

  collections 
  under 
  their 
  control, 
  viz., 
  the 
  Gray 
  and 
  National 
  

   Herbaria; 
  .also 
  to 
  Dr. 
  N. 
  L. 
  Brittori 
  for 
  the 
  Columbia 
  Col- 
  

   lege 
  collection, 
  especially 
  the 
  Torrey 
  types 
  ; 
  to 
  Mr. 
  E. 
  L. 
  

   Greene, 
  T. 
  S. 
  Brandegee 
  and 
  W. 
  M. 
  Canby 
  for 
  specimens 
  

   and 
  the 
  use 
  of 
  their 
  herbaria. 
  

  

  Several 
  of 
  our 
  Perityles 
  have, 
  until 
  the 
  present 
  year, 
  been 
  

   almost 
  unknown 
  and 
  considerably 
  confused, 
  but 
  this 
  last 
  

   year, 
  through 
  the 
  energetic 
  labors 
  of 
  Dr. 
  Edward 
  Palmer 
  

   and 
  T. 
  S 
  Brandegee 
  in 
  Lower 
  California, 
  two 
  of 
  these 
  rari- 
  

   ties 
  have 
  been 
  rediscovered 
  and 
  will 
  require 
  some 
  shifting 
  in 
  

  

  the 
  names 
  as 
  they 
  now 
  prevail. 
  

  

  The 
  species 
  of 
  Perityle 
  are 
  quite 
  variable 
  and 
  their 
  limi- 
  

   tation 
  often 
  uncertain. 
  I 
  have 
  considered 
  in 
  the 
  paper 
  largely 
  

   the 
  P. 
  Fitchii 
  and 
  P. 
  Californica 
  groups 
  of 
  Gray, 
  and 
  espe- 
  

   cially 
  these 
  two 
  species. 
  

  

  r. 
  P. 
  Fitchii, 
  and 
  its 
  near 
  relative 
  P. 
  Brandegei,^ 
  are 
  

   readily 
  distinguished 
  from 
  other 
  Perityles 
  by 
  their 
  4-sided 
  

   akenes, 
  no 
  pappus 
  of 
  either 
  crown 
  or 
  awns; 
  sometimes, 
  

   however, 
  a 
  few 
  akenes 
  are 
  found 
  in 
  the 
  heads 
  with 
  but 
  3 
  and 
  

  

  some 
  2 
  angles 
  ; 
  rays 
  white. 
  

  

  II. 
  P. 
  Californica, 
  P. 
  deltoidea 
  and 
  P. 
  microglossa 
  are 
  

   readily 
  distinguished 
  from 
  other 
  species 
  by 
  the 
  thick 
  white 
  

   callous 
  margin 
  of 
  the 
  akene, 
  and 
  yellow 
  rays. 
  

  

  III. 
  P. 
  Emoryi 
  and 
  P. 
  Greenei 
  are 
  dithcult 
  to 
  separate 
  

   from 
  each 
  other, 
  but 
  are 
  easily 
  separated 
  frqm 
  the 
  above 
  

   •species 
  The 
  akenes 
  are 
  much 
  flattened, 
  2-angled, 
  the 
  mar- 
  

   gin 
  often 
  densely 
  hirsute 
  and 
  with 
  a 
  more 
  or 
  less 
  prominent 
  

   crown 
  ; 
  rays 
  white. 
  

  

  1. 
  P. 
  incana 
  Gray, 
  a 
  well 
  marked 
  species 
  only 
  known 
  

   from 
  Gaudalupe 
  Island, 
  collected 
  by 
  Palmer 
  and 
  Greene. 
  

  

  2. 
  P. 
  dissecta 
  Gray, 
  and 
  

  

  3. 
  P. 
  coronofifolia 
  Gray, 
  are 
  rare 
  species 
  not 
  recently 
  

  

  collected. 
  

  

  4. 
  P. 
  Fitchii 
  Torr. 
  One 
  to 
  two 
  feet 
  high, 
  branching 
  

   above, 
  viscid 
  pubescent 
  : 
  leaves 
  an 
  inch 
  or 
  less 
  long, 
  broadly 
  

   ovate, 
  doubly 
  serrate 
  : 
  heads 
  solitary 
  on 
  peduncles 
  about 
  an 
  

   inch 
  long, 
  5 
  to 
  6 
  lines 
  high: 
  disk 
  corollas 
  2 
  lines 
  long, 
  

   slender, 
  gradually 
  passing 
  into 
  the 
  proper 
  tube 
  : 
  rays 
  white, 
  

   sometimes 
  drying 
  pinkish 
  : 
  style 
  branches 
  with 
  slender 
  acum- 
  

   inate 
  appendages 
  : 
  akenes 
  somewhat 
  flattened, 
  4-angled,i 
  

   to 
  U 
  lines 
  long, 
  narrowly 
  linear, 
  faces 
  smooth, 
  angles 
  slightly 
  

   hirsute 
  (in 
  dry 
  akenes) 
  with 
  straight 
  appressed 
  hairs 
  (hg. 
  i). 
  

  

  Much 
  uncertainty 
  has 
  existed 
  with 
  reference 
  to 
  this 
  species. 
  The 
  

   type 
  specimens 
  collected 
  by 
  Bev. 
  A. 
  Fitch 
  were 
  very 
  poor 
  and 
  imma- 
  

  

  , 
  * 
  

  

  