﻿22 
  

  

  KEY 
  AND 
  FLORA 
  

  

  Scapes 
  erect, 
  becoming 
  longer 
  than 
  the 
  leaves, 
  cylindrical, 
  

   spongy. 
  Flowers 
  bisexual, 
  in 
  paniculate, 
  3-bracted 
  umbels, 
  

  

  small, 
  white 
  or 
  pink. 
  

   Stamens 
  6-9. 
  Ovaries 
  

   numerous 
  in 
  one 
  or 
  more 
  

   whorls 
  on 
  a 
  flat 
  recepta- 
  

   cle. 
  Fruit 
  1-seeded 
  akenes 
  

   which 
  are 
  ribbed 
  on 
  the 
  

   back 
  and 
  sides.* 
  

  

  1. 
  A. 
  Plantago-aquatica 
  L. 
  

   WATER 
  PLANTAIN. 
  Peren- 
  

   nial 
  ; 
  root 
  fibrous. 
  Leaves 
  

   ovate 
  or 
  somewhat 
  cordate, 
  

   5-7-nerved 
  when 
  erect, 
  float- 
  

   ing 
  leaves 
  narrower 
  and 
  

   sometimes 
  linear. 
  Scapes 
  

   usually 
  single 
  ; 
  panicle 
  1-2 
  

   ft. 
  long 
  ; 
  flowering 
  branches 
  

   whorled, 
  subtended 
  by 
  three 
  

   narrow, 
  striate 
  bracts 
  ; 
  pedi- 
  

   cels 
  slender, 
  elongated. 
  Ova- 
  

   ries 
  15-20 
  in 
  a 
  single 
  whorl 
  ; 
  

   base 
  of 
  the 
  short 
  style 
  per- 
  

   sistent, 
  forming 
  a 
  beak 
  at 
  

   the 
  inner 
  angle 
  of 
  the 
  akene. 
  

   Akenes 
  obliquely 
  obovate, 
  

   2-3-keeled 
  on 
  the 
  back. 
  

   Common 
  in 
  ponds 
  and 
  

   muddy 
  places.* 
  

  

  FIG. 
  2. 
  Diagrammatic 
  

   representation 
  of 
  a 
  

   several 
  -flowered 
  

   grass 
  spikelet 
  

  

  g, 
  g', 
  the 
  glumes; 
  p, 
  

   p', 
  the 
  palets 
  ; 
  I, 
  lod- 
  

   icules 
  ; 
  /, 
  a 
  flower. 
  

   The 
  axis 
  is 
  much 
  

   lengthened, 
  to 
  sep- 
  

   arate 
  the 
  flowers. 
  

   (After 
  Schimper) 
  

  

  FIG. 
  3. 
  Spike-like 
  

   panicle 
  of 
  ver- 
  

   nal 
  grass 
  (An- 
  

   thoxanthum) 
  

  

  a, 
  mature 
  anthers. 
  

   (Slightly 
  enlarged) 
  

  

  4. 
  GRAMINEJE. 
  GRASS 
  

   FAMILY 
  

  

  Mostly 
  herbs, 
  with 
  usu- 
  

   ally 
  hollow 
  stems, 
  closed 
  

   and 
  enlarged 
  at 
  the 
  nodes. 
  

   Leaves 
  alternate, 
  in 
  two 
  ranks, 
  with 
  sheathing 
  bases, 
  which 
  

   are 
  split 
  open 
  on 
  the 
  side 
  opposite 
  the 
  blade. 
  Flowers 
  nearly 
  

   or 
  quite 
  destitute 
  of 
  floral 
  envelopes, 
  solitary, 
  and 
  borne 
  in 
  

   the 
  axils 
  of 
  scaly 
  bracts, 
  which 
  are 
  arranged 
  in 
  two 
  ranks 
  

  

  