﻿398 
  JOURNAI, 
  OF 
  THE 
  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  VOIy. 
  12, 
  NO. 
  17 
  

  

  The 
  hairs 
  of 
  the 
  under 
  leaf 
  surface 
  in 
  this 
  species 
  are 
  so 
  small 
  that 
  under 
  a 
  

  

  12x 
  lens 
  they 
  appear 
  merely 
  as 
  densely 
  crowded 
  papillae. 
  Viewed 
  on 
  a 
  cross 
  

  

  section 
  of 
  the 
  leaf 
  under 
  a 
  49x 
  binocular, 
  they 
  are 
  seen 
  to 
  be 
  conical 
  hairs, 
  

  

  standing 
  off 
  stiffly 
  at 
  a 
  right 
  angle 
  from 
  the 
  leaf 
  surface, 
  and 
  about 
  one-half 
  

  

  to 
  one-fifth 
  as 
  long 
  as 
  the 
  thickness 
  of 
  the 
  leaf. 
  

  

  6. 
  Piratinera 
  velutina 
  Blake, 
  sp. 
  nov. 
  Velvetleaf 
  letterwood. 
  

  

  Fig. 
  1, 
  d. 
  

  

  Young 
  branchlets 
  brown, 
  finely, 
  densely, 
  and 
  rather 
  softly 
  spreading- 
  

   puberulous, 
  the 
  older 
  glabrate, 
  gray-barked; 
  internodes 
  mostly 
  1 
  to 
  2.5 
  

   cm. 
  long; 
  stipules 
  lance-subulate, 
  4.5 
  mm. 
  long, 
  appressed-puberulous 
  on 
  

   both 
  sides, 
  deciduous; 
  petioles 
  3 
  to 
  5 
  mm. 
  long, 
  scarcely 
  sulcate 
  above, 
  

   puberulous 
  like 
  the 
  branchlets; 
  leaf 
  blades 
  oblong 
  to 
  oblong-oval, 
  rarely 
  

   slightly 
  obovate-oval, 
  (5) 
  7 
  to 
  12 
  cm. 
  long, 
  3 
  to 
  5.5 
  cm. 
  wide, 
  abruptly 
  short- 
  

   pointed 
  with 
  obtuse 
  apex, 
  at 
  base 
  very 
  unequal, 
  broadly 
  rounded 
  on 
  one 
  

   side, 
  obliquely 
  rounded 
  on 
  the 
  other, 
  entire, 
  subcoriaceous, 
  above 
  deep 
  green, 
  

   shining, 
  glabrous, 
  beneath 
  paler 
  (brownish 
  or 
  griseous-green 
  when 
  dry), 
  

   on 
  the 
  chief 
  veins 
  hispidulous-pilosulous 
  with 
  rather 
  soft 
  spreading 
  or 
  an- 
  

   trorse 
  hairs, 
  on 
  surface 
  very 
  densely 
  papillose 
  and 
  rather 
  densely 
  and 
  softly 
  

   velvety-pilosulous 
  with 
  spreading 
  hairs, 
  featherveined, 
  the 
  chief 
  lateral 
  

   veins 
  8 
  to 
  1 
  1 
  pairs, 
  diverging 
  at 
  an 
  angle 
  of 
  GO 
  ° 
  to 
  SO 
  °, 
  united 
  inside 
  the 
  mar- 
  

   gin, 
  with 
  the 
  secondaries 
  flattish 
  or 
  delicately 
  prominulous-reticulate 
  above, 
  

   prominulous-reticulate 
  beneath, 
  the 
  costa 
  prominent 
  beneath; 
  peduncles 
  

   (very 
  young) 
  solitary, 
  axillary, 
  erect, 
  puberulous, 
  5 
  mm. 
  long 
  or 
  less; 
  young 
  

   receptacles 
  depressed-subglobose, 
  about 
  4 
  . 
  5 
  mm. 
  thick, 
  densely 
  covered 
  with 
  

   orbicular, 
  peltate, 
  puberulous 
  and 
  ciliolate 
  bracts; 
  9 
  flowers 
  2 
  or 
  3; 
  6 
  

   flowers 
  numerous, 
  1-androus, 
  the 
  perianth 
  monophyllous, 
  split 
  on 
  one 
  side; 
  

   fruit 
  not 
  seen. 
  

  

  Type 
  in 
  the 
  U. 
  S. 
  National 
  Herbarium, 
  no. 
  1,120,361, 
  collected 
  at 
  Sectie 
  

   O, 
  a 
  forest 
  station 
  at 
  Km. 
  65 
  of 
  railway, 
  Surinam, 
  February 
  15, 
  1916, 
  by 
  

   the 
  Forestry 
  Service 
  of 
  Surinam 
  (no. 
  1647). 
  Duplicate 
  in 
  herbarium 
  of 
  

   Yale 
  University. 
  

   Additional 
  specimens 
  examined: 
  

  

  Surinam: 
  Sectie 
  O, 
  November 
  3, 
  1915, 
  Forestry 
  Service 
  1158 
  (Yale), 
  

   November 
  22, 
  1915, 
  Forestry 
  Service 
  1378 
  (Yale). 
  Irakoeka 
  Creek, 
  

   Surinam 
  River, 
  January 
  11, 
  1922, 
  Forestry 
  Service 
  5498 
  (Yale). 
  

  

  Brazil: 
  AlluWal 
  forest, 
  Rio 
  Mapuera, 
  Amazonia, 
  December 
  8, 
  1907, 
  

   Ducke 
  9072 
  (N). 
  

  

  The 
  hairs 
  on 
  the 
  under 
  leaf 
  surface 
  of 
  this 
  species 
  are 
  much 
  longer 
  than 
  those 
  

   of 
  P. 
  scabridula, 
  being 
  readily 
  distinguishable 
  with 
  a 
  12x 
  lens, 
  and 
  about 
  

   equaling 
  the 
  thickness 
  of 
  the 
  leaf 
  tissue 
  when 
  seen 
  under 
  the 
  binocular. 
  

  

  The 
  species 
  bears 
  the 
  following 
  names: 
  "letterhout," 
  "roode 
  lelterhout" 
  

   (Dutch); 
  "letri," 
  "basra 
  letri" 
  (Negro 
  English); 
  "poevinga," 
  "pauletoe" 
  

   (Saramacca 
  Bush 
  Negro); 
  "sokone-biberoe," 
  "belekoro," 
  "koereroe" 
  (Aro- 
  

   wak 
  Indian); 
  "paida," 
  "wekere 
  paida," 
  "tianalin 
  weive," 
  "tokoro 
  apoUi 
  

   merie" 
  (Carab 
  Indian). 
  

  

  DOUBTFUL 
  SPECIES 
  

  

  Brosimum 
  aubletii 
  Poepp. 
  & 
  Endl. 
  Nov. 
  Gen. 
  & 
  Sp. 
  2: 
  34. 
  pi. 
  148, 
  J. 
  a-d. 
  

   1838. 
  

  

  