﻿19S 
  COLLECTIONS 
  TOWARDS 
  

  

  branches 
  dichotomous, 
  peduncles 
  few, 
  elongated, 
  and 
  forming 
  a 
  strag- 
  

   gling 
  corymb; 
  leaves 
  ovate, 
  amplexicaule 
  and 
  acute, 
  3 
  to 
  5-nerved 
  ; 
  

   calix 
  somewhat 
  longer 
  than 
  the 
  corolla, 
  segments 
  linear-lanceolate, 
  the 
  

   angles 
  of 
  the 
  junction 
  of 
  the 
  segments 
  salient 
  or 
  alated 
  ; 
  corolla 
  rosa- 
  

   ceous, 
  about 
  the 
  form 
  and 
  size 
  of 
  S. 
  angularis, 
  the 
  segments 
  oboval, 
  

   the 
  base 
  of 
  the 
  corolla 
  marked 
  with 
  a 
  5-rayed 
  greenish 
  star; 
  anthers 
  

   revolute; 
  style 
  one; 
  stigma 
  deeply 
  bifid. 
  — 
  Hah. 
  In 
  the 
  open 
  prairies 
  

   of 
  Arkansas 
  and 
  Red 
  river; 
  common. 
  Flowering 
  in 
  June 
  and 
  July. 
  

   — 
  Obs. 
  Perfectly 
  distinct 
  from 
  Chironia 
  trinervia 
  of 
  Ceylon, 
  with 
  

   which, 
  however, 
  it 
  agrees 
  in 
  the 
  artificial 
  character 
  ; 
  but 
  the 
  plant 
  of 
  

   Ceylon 
  produces 
  oval 
  leaves, 
  acute 
  at 
  both 
  extremities, 
  large 
  blue 
  

   flowers, 
  and 
  is 
  probably 
  a 
  genuine 
  Chironia, 
  a 
  genus 
  not 
  yet 
  discovered 
  

   in 
  America. 
  

  

  2. 
  S. 
  angularis, 
  Pursh, 
  Flor. 
  Am. 
  1, 
  p. 
  137. 
  

  

  Villarsia 
  lacunosa, 
  Venten. 
  Choix 
  de 
  Plant., 
  p. 
  9 
  (V. 
  aquatica, 
  

   Gmelin, 
  Syst. 
  Veg. 
  447; 
  Menyanthes 
  trachysperma, 
  Mich. 
  Flor. 
  Am. 
  

   1, 
  p. 
  126; 
  Villarsia 
  cordata, 
  Elliott, 
  Sketches 
  Bot.). 
  — 
  Obs. 
  This 
  plant 
  

   is 
  dioicous 
  and 
  polygamous. 
  In 
  the 
  plant 
  of 
  Mr 
  Elliott, 
  which 
  grows 
  

   also 
  in 
  the 
  ponds 
  of 
  New 
  Jersey, 
  the 
  leaves 
  are 
  larger 
  and 
  cordate, 
  the 
  

   stamina 
  effoete, 
  and 
  the 
  stigmas 
  exserted. 
  In 
  the 
  male 
  plant, 
  as 
  com- 
  

   monly 
  observed, 
  the 
  leaves 
  and 
  flowers 
  are 
  smaller, 
  the 
  anthers 
  perfect, 
  

   the 
  stigmas 
  small, 
  and 
  the 
  germ 
  infertile. 
  

  

  SriGELiA 
  Marilandica. 
  Lin. 
  Syst. 
  Veg. 
  p. 
  197; 
  Mich. 
  Flor. 
  Am. 
  1, 
  

   p. 
  147 
  ; 
  Ic. 
  Curt. 
  Magaz. 
  t. 
  80. 
  — 
  Hob. 
  On 
  the 
  banks 
  of 
  the 
  Arkansas, 
  

   in 
  the 
  forests 
  near 
  to 
  the 
  first 
  cliffs 
  on 
  the 
  banks 
  of 
  the 
  river. 
  

  

  ASCLEPIADEAE. 
  

  

  1. 
  Asclepias 
  debilis, 
  Mich. 
  Flor. 
  Am. 
  p. 
  116. 
  — 
  Rather 
  common 
  

   on 
  the 
  banks 
  of 
  the 
  Ohio 
  and 
  Mississippi. 
  

  

  2. 
  A. 
  variegata, 
  Willd. 
  Sp. 
  PI. 
  1, 
  p. 
  1265 
  ; 
  Icon. 
  Bot. 
  Magaz. 
  1 
  182 
  ; 
  

   Pluk. 
  Aim. 
  t. 
  77, 
  f. 
  1. 
  — 
  Hub. 
  Near 
  the 
  Cadron 
  settlement. 
  

  

  3. 
  A. 
  obtusifolia, 
  Mich. 
  Flor. 
  Am. 
  1, 
  p. 
  115. 
  — 
  Hah. 
  Near 
  the 
  gar- 
  

   rison 
  at 
  Belle 
  Point. 
  

  

  4. 
  A. 
  quadrifolia, 
  Jacquin, 
  Obs. 
  2, 
  t. 
  23 
  (Apocynum 
  umbellatum 
  

  

  