﻿104 
  KEY 
  AND 
  FLORA 
  

  

  1. 
  B. 
  alba 
  Boiss. 
  WIIITF. 
  MrsT.\i:i>. 
  Stein 
  2-5 
  ft. 
  high, 
  with 
  

   reflexi'il 
  hairs. 
  I 
  pper 
  leaves 
  pinnately 
  cut. 
  Pods 
  borne 
  on 
  spreading 
  

   pedicels, 
  liristly, 
  with 
  a 
  sword-shaped, 
  1-seeded 
  beak 
  occupying 
  more 
  

  

  than 
  half 
  their 
  length. 
  Seeds 
  pale. 
  Cultivated 
  from 
  Europe 
  and 
  

   introduced 
  to 
  some 
  extent. 
  

  

  2. 
  B. 
  arvensis 
  Kt/.e. 
  ('HAL-LOCK. 
  Stem 
  1-2 
  ft. 
  high; 
  it 
  and 
  the 
  

   leaves 
  rough-hairy. 
  I'pper 
  leaves 
  rhombic, 
  barely 
  toothed. 
  Flo 
  \\ers 
  

  

  in. 
  across, 
  somewhat 
  corymbed, 
  bright 
  yellow. 
  Pods 
  knotty, 
  

   spreading, 
  at 
  least 
  \_ 
  of 
  each 
  consisting 
  of 
  a 
  2-edged, 
  1 
  -seeded 
  beak. 
  

   A 
  -howy, 
  troublesome 
  weed 
  in 
  grain 
  fields. 
  Naturalized 
  from 
  Europe. 
  

  

  3. 
  B. 
  juncea 
  Co^son. 
  Similar 
  to 
  the 
  preceding, 
  but 
  nearly 
  or 
  

   quite 
  Smooth. 
  Pedicels 
  slender. 
  Beak 
  slender, 
  conical, 
  not 
  contain- 
  

   ing 
  a 
  seed. 
  Naturalized 
  from 
  Asia 
  and 
  becoming 
  very 
  abundant 
  

   eastward. 
  

  

  4. 
  B. 
  nigra 
  Koch. 
  P.I.ACK 
  Mi 
  >IAUI>. 
  Stem 
  3-0 
  ft. 
  high, 
  some- 
  

   what 
  hairy. 
  Lower 
  leaves 
  lyrate, 
  with 
  the 
  terminal 
  lobe 
  much 
  the 
  

   longest 
  ; 
  stem-leaves 
  linear-lanceolate, 
  entire 
  or 
  toothed, 
  smooth. 
  

   Pods 
  awl-shaped, 
  4-angled, 
  smooth, 
  lying 
  against 
  the, 
  stem; 
  seeds 
  

   browni>h, 
  more 
  biting 
  than 
  in 
  No. 
  1. 
  Cultivated 
  from 
  Europe 
  and 
  

   introduced. 
  

  

  VIII. 
  SISYMBRIUM 
  L. 
  

  

  Annual 
  or 
  biennial 
  herbs. 
  Radical 
  leaves 
  spreading 
  ; 
  stem 
  

   leaves 
  alternate, 
  often 
  eared 
  at 
  the 
  base. 
  Flowers 
  in 
  loose 
  

   racemes, 
  usually 
  yellow, 
  often 
  bracted. 
  Pods 
  generally 
  nar- 
  

   rowly 
  linear, 
  cylindrical, 
  or 
  4-6-angled 
  ; 
  seeds 
  many, 
  ellipsoid, 
  

   not 
  margined. 
  

  

  1. 
  S. 
  officinale 
  Scop., 
  var. 
  leiocarpum. 
  Hi 
  i><;i: 
  MISTAKD. 
  Stems 
  

   branching, 
  stiff. 
  Leaves 
  runci 
  nate-toot 
  lied 
  or 
  lolied. 
  Flowers 
  very 
  

   small, 
  pale 
  yellow. 
  Pods 
  somewhat 
  (i-sided, 
  awl-shaped, 
  smooth, 
  

   closely 
  pressed 
  against 
  the 
  stem. 
  An 
  unsightly 
  weed 
  in 
  \\astegroiind. 
  

   Naturalized 
  from 
  Europe. 
  

  

  2. 
  S. 
  canescens 
  Xutt. 
  TAN-V 
  MTSTAKII. 
  Stem 
  1-2 
  ft. 
  high. 
  

   Leaves 
  twice 
  pinnately 
  cut, 
  usually 
  covered 
  with 
  grayish 
  down. 
  

   Flowers 
  very 
  small, 
  yellowish. 
  Pods 
  oblong, 
  club-shaped, 
  4-angled. 
  

   borne 
  on 
  pedicels 
  projecting 
  almost 
  horizontally 
  from 
  the 
  stem, 
  in 
  

   long 
  racemes. 
  Common 
  westward. 
  

  

  IX. 
  RADICULA 
  Hill. 
  (RORIPA) 
  

  

  Annual 
  or 
  biennial, 
  mostly 
  aquatic 
  plants. 
  Stems 
  erect 
  or 
  

   diffuse, 
  often 
  widely 
  branching. 
  Leaves 
  simple, 
  pinnately 
  

   lobed. 
  Flowers 
  small, 
  white 
  or 
  yellow. 
  Sepals 
  spreading. 
  

  

  