﻿30 
  BOTANICAL 
  GAZETTE. 
  [February, 
  

  

  A 
  Revision 
  of 
  North 
  American 
  Cornace?p. 
  1. 
  

  

  JOHN 
  M. 
  COULTER 
  AND 
  WALTER 
  H. 
  EVANS. 
  

  

  The 
  term 
  "North 
  American" 
  implies 
  the 
  customary 
  

   limitation 
  north 
  of 
  Mexico, 
  an 
  unnatural 
  one, 
  but 
  necessary 
  

   m 
  the 
  present 
  state 
  of 
  our 
  information. 
  

  

  The 
  three 
  genera 
  of 
  this 
  order 
  represented 
  in 
  North 
  

   America 
  are 
  so 
  different 
  from 
  each 
  other 
  that 
  they 
  have 
  

   often 
  been 
  separated 
  into 
  as 
  many 
  orders. 
  Our 
  purpose, 
  

   however, 
  is 
  not 
  to 
  discuss 
  their 
  ordinal 
  relationships, 
  but 
  

   merely 
  to 
  present 
  their 
  species. 
  For 
  this 
  reason, 
  we 
  give 
  no 
  

   generic 
  descriptions, 
  but 
  accept 
  the 
  genera 
  as 
  ordinarily 
  un- 
  

   derstood. 
  We 
  are 
  greatly 
  indebted 
  to 
  the 
  following 
  persons, 
  

   who 
  promptly 
  put 
  at 
  our 
  disposal 
  the 
  collections 
  which 
  they 
  

   own 
  or 
  have 
  m 
  charge: 
  Dr. 
  Sereno 
  Watson, 
  Dr. 
  George 
  

  

  Vasey, 
  Professor 
  E. 
  

   Mr, 
  John 
  

  

  Jol 
  

  

  Under 
  each 
  species 
  the 
  general 
  range 
  is 
  first 
  given, 
  fol- 
  

   lowed 
  by 
  a 
  list 
  of 
  CO 
  lector, 
  whose 
  material 
  we 
  have 
  exam- 
  

   ined 
  This 
  fact 
  should 
  be 
  clearly 
  understood, 
  as 
  an 
  exhaust- 
  

   hnna 
  t^lfr 
  ."'-"".^ 
  collectors 
  is 
  not 
  intended. 
  It 
  was 
  

  

  n.s^fd 
  nn^ 
  ■ 
  '"^ 
  u""^''^^- 
  °"^>' 
  '^'^'^ 
  specimens 
  that 
  had 
  

   passed 
  under 
  our 
  observation, 
  and 
  so 
  avoid 
  all 
  possible 
  con- 
  

  

  fine. 
  ^^SflV 
  T"'''^—;^^.^ 
  involucrate 
  and 
  non-involucrate 
  

   flower-clusters 
  furnish 
  the 
  first 
  and 
  most 
  evident 
  grouping 
  of 
  

  

  Sex?nr':;d 
  -^^ 
  "°"""y°l"'^''^^^ 
  ^P^^'- 
  -^^ 
  thf 
  mo^st 
  per- 
  

   Amonf 
  'thl 
  t/"" 
  r^^'""^ 
  instances 
  evidentlv 
  intergrade. 
  

   tant 
  b!il 
  t 
  ■ 
  ^^I'^'^T' 
  °^ 
  '^'^ 
  pubescence 
  is 
  very 
  impoi- 
  

   case 
  ^hH 
  ^'^^'' 
  ^"1 
  appressed 
  or 
  silky. 
  In 
  the 
  former 
  

   stiff 
  and 
  mor'p' 
  T'l 
  """"^f^ 
  '"' 
  "^' 
  "^^^^^ 
  the 
  middle, 
  are 
  very 
  

  

  found 
  nnnn 
  tT.! 
  S'^^^^' 
  buch 
  hairs 
  are 
  almost 
  un 
  versallv 
  

  

  under 
  l^-l'^' 
  Z^"'' 
  ^^^^T'^-^'^'' 
  °^ 
  ^'^''^^^^^ 
  but 
  upon 
  the 
  

   pubescrce 
  x^^^ 
  may 
  be 
  replaced 
  by 
  a 
  loose 
  and 
  silky 
  

  

  o 
  tuTerculate 
  A 
  '• 
  Tu''^ 
  """^' 
  °"^ 
  ^"d, 
  and 
  is 
  not 
  rigid 
  

   cLce 
  mav 
  oc;...,^ 
  ^^ 
  to 
  be 
  expected, 
  both 
  forms 
  of 
  pubes- 
  

   but 
  "h^e^ 
  ch^rnc^"^^"^' 
  ^' 
  ^°^"^ 
  "P^" 
  ^ 
  lower 
  leaf-siirface, 
  

  

  thouo-h 
  in 
  snmpl!^' 
  *^^^"«h 
  excellent 
  specific 
  characters, 
  

   Slv'soT 
  C 
  Sr.i^!^ 
  .?^:! 
  .r 
  -'-^-gly 
  variable 
  

  

  tolonifi 
  

  

  