﻿2 
  KEY 
  AND 
  FLORA 
  

  

  the 
  genus 
  has 
  been 
  reached, 
  presents 
  no 
  difficulty 
  in 
  a 
  little 
  

   flora 
  like 
  the 
  present 
  one. 
  

  

  A 
  single 
  example 
  may 
  suffice 
  to 
  illustrate 
  more 
  in 
  detail 
  

   the 
  manner 
  of 
  determining 
  species. 
  Suppose 
  the 
  student 
  to 
  

   have 
  in 
  hand 
  a 
  flowering 
  specimen 
  of 
  lily 
  of 
  the 
  valley. 
  Turn- 
  

   ing 
  to 
  the 
  key, 
  page 
  5, 
  it 
  is 
  evident 
  from 
  the 
  statements 
  con- 
  

   cerning 
  Gymnosperms 
  that 
  the 
  plant 
  does 
  not 
  belong 
  under 
  

   that 
  head. 
  Under 
  Angiosperms 
  it 
  is 
  clear, 
  from 
  the 
  numerical 
  

   plan 
  of 
  the 
  flower 
  (in 
  threes) 
  and 
  the 
  parallel-veined 
  leaves, 
  

   that 
  the 
  plant 
  is 
  a 
  Monocotyledon. 
  Among 
  Monocotyledons 
  

   three 
  general 
  groups 
  are 
  designated 
  by 
  as 
  many 
  numbers 
  in 
  

   parenthesis. 
  The 
  flower 
  in 
  hand 
  belongs 
  under 
  (3) 
  " 
  Flowers 
  

   not 
  on 
  a 
  spadix." 
  Under 
  this 
  head 
  the 
  choice 
  is 
  first 
  be- 
  

   tween 
  (a) 
  " 
  Carpels 
  numerous 
  and 
  separate" 
  and 
  (ft)" 
  Carpels 
  

   united." 
  In 
  the 
  lily 
  of 
  the 
  valley 
  they 
  are 
  united. 
  The 
  next 
  

   choice 
  is 
  between 
  " 
  * 
  Perianth 
  hypogynous 
  " 
  and 
  " 
  ** 
  Peri- 
  

   anth 
  not 
  hypogynous." 
  This 
  flower 
  is 
  hypogynous. 
  The 
  

   families 
  with 
  hypogynous 
  perianth 
  are 
  grouped 
  under 
  three 
  

   divisions 
  (distinguished 
  by 
  f, 
  tt, 
  ttt 
  respectively), 
  and 
  of 
  

   these 
  the 
  last, 
  with 
  its 
  " 
  Perianth 
  actinomorphic, 
  its 
  divi- 
  

   sions 
  all 
  alike 
  or 
  nearly 
  so, 
  petal-like," 
  corresponds 
  to 
  the 
  

   flower 
  under 
  examination 
  and 
  refers 
  the 
  student 
  to 
  "10. 
  Lily 
  

   Family, 
  page 
  6." 
  Turning 
  to 
  the 
  key 
  to 
  the 
  genera 
  of 
  the 
  

   Lily 
  family, 
  page 
  31, 
  two 
  subfamilies 
  are 
  found. 
  Since 
  the 
  

   plant 
  is 
  not 
  a 
  climber 
  it 
  belongs 
  to 
  " 
  Subfamily 
  I. 
  Liliaceae 
  

   Proper." 
  

  

  This 
  subfamily 
  is 
  divided 
  into 
  five 
  groups 
  designated 
  by 
  

   capital 
  letters. 
  The 
  lily 
  of 
  the 
  valley 
  has 
  an 
  undivided 
  style 
  

   and 
  springs 
  from 
  a 
  rootstock, 
  therefore 
  it 
  belongs 
  to 
  group 
  B. 
  

   Reading 
  the 
  descriptions 
  under 
  B, 
  none 
  is 
  found 
  to 
  agree 
  with 
  

   the 
  plant 
  in 
  hand 
  until 
  the 
  next 
  to 
  the 
  last 
  is 
  reached 
  : 
  " 
  Leaves 
  

   only 
  2, 
  directly 
  from 
  the 
  rootstock. 
  Flowers 
  in 
  a 
  raceme, 
  bell- 
  

   shaped, 
  white, 
  sweet-scented, 
  Convallaria." 
  

  

  