﻿A 
  FLORA 
  OF 
  ARKANSAS 
  TERRITORY. 
  201 
  

  

  4. 
  P. 
  *angustifo!ius. 
  Caule 
  erecto, 
  foliis 
  linearibus 
  sub-oppositis, 
  

   umbellis 
  caulinis 
  subsessilibus; 
  lepanthium 
  antheridio 
  sublongius, 
  ses- 
  

   sile, 
  foliolis 
  apice 
  tridentatis. 
  

  

  Desaript. 
  Perennial. 
  Stem 
  simple, 
  herbaceous 
  and 
  slender, 
  the 
  

   lower 
  part 
  naked, 
  about 
  eighteen 
  inches 
  high 
  ; 
  leaves 
  very 
  long, 
  narrow 
  

   and 
  acute, 
  somewhat 
  revolute 
  and 
  scabrous 
  on 
  the 
  margin, 
  one 
  to 
  one 
  

   and 
  a 
  half 
  lines 
  wide, 
  opposite 
  and 
  alternate, 
  nerves 
  confluent 
  below 
  

   the 
  margin 
  ; 
  umbells 
  globular, 
  small, 
  three 
  or 
  four 
  to 
  eight 
  ; 
  pedicells 
  

   about 
  the 
  length 
  of 
  the 
  flowers 
  ; 
  flowers 
  greenish, 
  with 
  a 
  mixture 
  of 
  

   white 
  ; 
  segments 
  of 
  the 
  corolla 
  oblong, 
  reflected 
  ; 
  lepanthium 
  sessile, 
  

   divisions 
  linear, 
  longer 
  than 
  the 
  antheridium, 
  tridentate 
  above, 
  the 
  

   central 
  denture 
  minute, 
  concave 
  and 
  auriculate 
  below; 
  clefts 
  of 
  the 
  

   antheridium 
  salient 
  from 
  the 
  base 
  to 
  the 
  summit; 
  cusps 
  broad 
  and 
  

   membranaceous, 
  concealing 
  the 
  stigma; 
  follicles 
  two. 
  — 
  Hah. 
  In 
  dry 
  

   prairies 
  from 
  Fort 
  Smith 
  to 
  Red 
  river. 
  Flowering 
  in 
  June. 
  — 
  Obs. 
  

   This 
  species 
  appears 
  to 
  be 
  very 
  nearly 
  related 
  to 
  Gomphocarpus, 
  and 
  

   also 
  very 
  nearly 
  to 
  Asclepias, 
  particularly 
  A. 
  cinerea, 
  from 
  which 
  it 
  

   merely 
  differs 
  in 
  the 
  absence 
  of 
  the 
  short 
  internal 
  awn; 
  it 
  may, 
  how- 
  

   ever, 
  be 
  considered 
  as 
  present 
  in 
  the 
  central, 
  acute 
  and 
  shorter 
  third 
  

   denture 
  of 
  the 
  segments 
  of 
  the 
  lepanthium. 
  

  

  Dubious 
  Species. 
  5. 
  P. 
  obovatus 
  (Asclepias 
  obovata, 
  Elliott, 
  

   Sketches, 
  p. 
  321). 
  Foliis 
  obovatis 
  mucronatis, 
  subtus 
  tomentosis; 
  

   umbellis 
  subsessilibus; 
  lepanthium 
  antheridio 
  duplo 
  longius. 
  — 
  Hah. 
  

   In 
  Georg 
  : 
  a. 
  

  

  Anantherix, 
  Nuttall, 
  Gen. 
  Am. 
  vol. 
  1, 
  p. 
  169. 
  Corolla 
  subcam- 
  

   panulata 
  quinquefida; 
  lepanthium 
  simplex, 
  quinquelobum, 
  lobis 
  com- 
  

   pressis 
  vacuis 
  incurvatis 
  laminula 
  ab 
  apice 
  interior! 
  auctis; 
  antheridium 
  

   superius 
  interdum 
  pedicellatum. 
  Caetera 
  Asclepias. 
  

  

  Caulis 
  erectus, 
  herbaceus 
  ; 
  folia 
  alterna 
  aut 
  opposita, 
  subverticillata, 
  

   interdum 
  axillis 
  spinulosis; 
  flores 
  magni 
  umbellati 
  aut 
  subpaniculati, 
  

   terminales 
  ; 
  folliculi 
  muricati 
  aut 
  laeves. 
  Calotropis 
  affine. 
  

  

  1. 
  A. 
  viridis 
  (Anantherix 
  viridis, 
  Nuttall, 
  Gen. 
  Am. 
  vol. 
  1, 
  p. 
  169; 
  

  

  Asclepias 
  viridis? 
  Walter, 
  Flor. 
  Car. 
  p. 
  107; 
  Asclepias 
  connivens, 
  

  

  Baldwin 
  in 
  Elliott's 
  Sketches, 
  p. 
  320 
  ; 
  Podostigma 
  viridis, 
  Elliott, 
  p. 
  

  

  327). 
  Foliis 
  oppositis 
  sessilibus 
  obovatis 
  oblongis 
  mucronulatis 
  glabri- 
  

  

  vol. 
  v. 
  — 
  3 
  A 
  

  

  