﻿54 
  JOURNAL 
  OF 
  THE) 
  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  VOL. 
  12, 
  NO. 
  3 
  

  

  The 
  percentage 
  of 
  residue 
  obtained 
  was 
  corrected 
  for 
  the 
  minor 
  non- 
  

   volatile 
  constituents, 
  as 
  follows: 
  Na20, 
  0.21 
  per 
  cent; 
  MgO, 
  0.13 
  

   per 
  cent; 
  nonvolatile 
  insoluble 
  matter, 
  0.06 
  per 
  cent, 
  and 
  SO3 
  retained 
  

   in 
  the 
  residue, 
  0.10 
  per 
  cent; 
  the 
  sum 
  of 
  which 
  is 
  0.50 
  per 
  cent. 
  

  

  BOTANY. 
  — 
  On 
  the 
  species 
  of 
  Dalbergia 
  of 
  Mexico 
  and 
  Central 
  America. 
  

   H. 
  PlTTlER.^ 
  

  

  As 
  considered 
  in 
  the 
  light 
  of 
  modern 
  taxonomy, 
  the 
  genus 
  Dal- 
  

   bergia 
  includes 
  the 
  former 
  genera 
  Amerimnon 
  and 
  Ecastophyllum. 
  

   There 
  is 
  no 
  generic 
  difference 
  between 
  Amerimnon, 
  established 
  by 
  

   Browne 
  in 
  1756 
  to 
  include 
  Dalbergias 
  with 
  samaroid 
  pods, 
  and 
  

   Ecastophyllum 
  of 
  the 
  same 
  author 
  and 
  date, 
  containing 
  the 
  species 
  

   with 
  nummular 
  pods. 
  On 
  the 
  other 
  hand, 
  on 
  the 
  evidence 
  of 
  the 
  

   generic 
  definition, 
  the 
  species 
  of 
  Amerimnon 
  do 
  not 
  fit 
  into 
  Ecasto- 
  

   phyllum, 
  and 
  species 
  of 
  Ecastophyllum 
  cannot 
  come 
  under 
  Amerimnon. 
  

  

  In 
  1781, 
  Linnaeus 
  filius 
  described 
  his 
  new 
  genus 
  Dalbergia, 
  which 
  

   under 
  both 
  the 
  International 
  and 
  the 
  American 
  Rules 
  would 
  not 
  be 
  

   valid, 
  but 
  for 
  the 
  fact 
  that 
  neither 
  of 
  the 
  two 
  names 
  having 
  the 
  priority 
  

   really 
  represents 
  a 
  generic 
  entity, 
  but 
  only 
  one 
  part 
  of 
  a 
  single 
  genus, 
  

   while 
  the 
  later 
  name 
  was 
  intended 
  to 
  apply 
  to 
  both 
  parts. 
  

  

  In 
  this 
  paper, 
  therefore, 
  in 
  accordance 
  with 
  the 
  well 
  founded 
  con- 
  

   clusions 
  given 
  by 
  Prain^ 
  in 
  his 
  extensive 
  monograph 
  ''The 
  Species 
  of 
  

   Dalbergia 
  of 
  South 
  Eastern 
  Asia," 
  the 
  name 
  Dalbergia 
  is 
  retained 
  to 
  

   designate 
  the 
  genus; 
  Amerimnon 
  becomes 
  the 
  name 
  of 
  a 
  subgenus, 
  

   while 
  the 
  species 
  of 
  Ecastophyllum 
  are 
  transferred 
  to 
  a 
  single 
  section 
  

   of 
  the 
  same. 
  This 
  is 
  the 
  view 
  accepted 
  by 
  all 
  European 
  botanists 
  

   and, 
  I 
  believe, 
  by 
  the 
  majority 
  of 
  those 
  on 
  this 
  side 
  of 
  the 
  Atlantic. 
  

   In 
  all 
  the 
  recent 
  literature 
  on 
  the 
  subject, 
  including 
  the 
  description 
  of 
  a 
  

   large 
  number 
  of 
  species 
  old 
  and 
  new, 
  the 
  same 
  name 
  is 
  used, 
  so 
  that 
  

   the 
  resuscitation 
  of 
  Amerimnon 
  as 
  a 
  substitute 
  for 
  Dalbergia 
  would 
  

   cause 
  a 
  great 
  and 
  useless 
  confusion, 
  even 
  omitting 
  the 
  fact 
  that 
  it 
  

   cannot 
  be 
  applied 
  to 
  the 
  genus 
  as 
  understood 
  today. 
  

  

  In 
  its 
  original 
  form, 
  the 
  present 
  paper 
  included 
  full 
  descriptions 
  of 
  

   all 
  Mexican 
  and 
  Central 
  American 
  species. 
  Circumstances 
  now 
  have 
  

   made 
  it 
  necessary 
  to 
  suppress 
  the 
  descriptions 
  of 
  old 
  species 
  and 
  to 
  re- 
  

   duce 
  the 
  paper 
  to 
  a 
  simple 
  enumeration 
  of 
  them 
  , 
  with 
  their 
  known 
  dis- 
  

   tribution, 
  and 
  to 
  descriptions 
  of 
  only 
  the 
  proposed 
  new 
  species. 
  

   In 
  addition, 
  the 
  following 
  key 
  has 
  been 
  prepared. 
  

  

  ^ 
  Received 
  December 
  15, 
  1921. 
  

  

  2 
  Ann. 
  Bot. 
  Gard. 
  Calc. 
  10: 
  10-11. 
  1904. 
  

  

  