﻿MUSTARD 
  FAMILY 
  105 
  

  

  Stamens 
  1-6. 
  Pod 
  short 
  and 
  broad 
  or 
  nearly 
  linear 
  ; 
  seeds 
  

   numerous, 
  in 
  2 
  rows 
  in 
  each 
  cell.* 
  

  

  1. 
  R. 
  Nasturtium-aquaticum 
  B. 
  &R. 
  WATERCRESS. 
  Aquatic 
  herbs. 
  

   Stems 
  smooth, 
  diffuse, 
  rooting 
  at 
  the 
  joints. 
  Leaves 
  with 
  3-9 
  rounded, 
  

   pinnate 
  lobes, 
  the 
  terminal 
  lobe 
  much 
  the 
  largest. 
  Racemes 
  elon- 
  

   gating 
  in 
  fruit. 
  Petals 
  white, 
  twice 
  the 
  length 
  of 
  the 
  sepals. 
  Pods 
  

   linear, 
  i-f 
  in. 
  long, 
  on 
  slender, 
  spreading 
  pedicels. 
  In 
  ditches 
  and 
  

   slow 
  streams. 
  Often 
  used 
  for 
  salad.* 
  

  

  2. 
  R. 
  sinuata 
  Greene. 
  SPREADING 
  YELLOW 
  CRESS. 
  Perennial. 
  

   Stems 
  low 
  and 
  spreading. 
  Leaves 
  oblong 
  or 
  lanceolate, 
  pinnately 
  

   cleft, 
  the 
  lobes 
  obtuse. 
  Flowers 
  yellow, 
  about 
  i 
  in. 
  in 
  diameter. 
  

   Pods 
  linear 
  oblong, 
  i-| 
  in. 
  long. 
  River 
  bottoms 
  and 
  moist 
  ground 
  W. 
  

  

  3. 
  R. 
  palustris 
  Moench. 
  YELLOW 
  WATERCRESS. 
  Annual 
  or 
  bien- 
  

   nial. 
  Stem 
  erect, 
  branched, 
  slightly 
  downy. 
  Leaves 
  irregularly 
  

   lyrate, 
  the 
  lower 
  petioled, 
  the 
  upper 
  sessile. 
  Flowers 
  small 
  ; 
  petals 
  

   yellow. 
  Pods 
  linear, 
  spreading, 
  longer 
  than 
  the 
  pedicels. 
  In 
  wet 
  

   places.* 
  

  

  4. 
  R. 
  Armoracia 
  Robinson. 
  HORSE-RADISH. 
  A 
  coarse 
  herb, 
  with 
  

   large 
  leaves, 
  from 
  stout, 
  long, 
  cylindrical 
  rootstocks 
  filled 
  with 
  a 
  very 
  

   sharp, 
  biting 
  juice. 
  Basal 
  leaves 
  long-petioled, 
  linear-oblong, 
  obtuse, 
  

   regularly 
  scalloped 
  ; 
  stem-leaves 
  sessile. 
  Racemes 
  in 
  panicles. 
  Pods 
  

   obovoid, 
  on 
  long, 
  slender 
  pedicels 
  ; 
  seeds 
  seldom 
  or 
  never 
  ripening. 
  

   Probably 
  from 
  Europe 
  ; 
  cultivated 
  and 
  often 
  introduced 
  in 
  damp 
  

   ground. 
  

  

  X. 
  BARBAREA 
  R. 
  Br. 
  

  

  Mostly 
  biennials, 
  somewhat 
  resembling 
  Radicula. 
  Flowers 
  

   yellow. 
  Pod 
  elongated, 
  linear, 
  cylindrical, 
  or 
  somewhat 
  4-sided. 
  

   Style 
  short. 
  Seeds 
  in 
  1 
  row 
  in 
  each 
  cell, 
  not 
  margined. 
  

  

  1. 
  B. 
  vulgaris 
  R. 
  Br. 
  WINTER 
  CRESS, 
  YELLOW 
  ROCKET. 
  Smooth, 
  

   with 
  tufted 
  stems 
  1-2 
  ft. 
  high. 
  Lower 
  leaves 
  petioled, 
  pinnately 
  cut, 
  

   with 
  1-4 
  pairs 
  of 
  lateral 
  divisions 
  and 
  a 
  rounded, 
  much 
  longer 
  

   terminal 
  one; 
  upper 
  leaves 
  nearly 
  or 
  quite 
  sessile. 
  Flowers 
  f 
  in. 
  in 
  

   diameter 
  or 
  less. 
  Pods 
  erect 
  or 
  spreading. 
  Fields 
  and 
  waste 
  ground. 
  

   Introduced 
  from 
  Europe 
  into 
  the 
  eastern 
  and 
  central 
  states- 
  

  

  XI. 
  DENTARIA 
  L. 
  

  

  Stems 
  naked 
  below, 
  2-3-leaved 
  above, 
  from 
  a 
  thickish, 
  more 
  

   or 
  less 
  knotted 
  or 
  interrupted 
  rootstock. 
  Flowers 
  rather 
  

   large, 
  in 
  early 
  spring. 
  Pod 
  lance-linear, 
  flattish 
  ; 
  seeds 
  in 
  1 
  

   row, 
  wingless 
  ; 
  seedstalks 
  broad 
  and 
  flat. 
  

  

  