﻿152 
  KEY 
  AND 
  FLORA 
  

  

  1-1 
  ] 
  in. 
  long. 
  In 
  cold 
  woods, 
  more 
  abundant 
  northward. 
  The 
  sap 
  

   of 
  this 
  tree 
  is 
  the 
  principal 
  source 
  of 
  maple 
  sugar, 
  and 
  some 
  forms 
  

   of 
  the 
  tree 
  produce 
  the 
  curled 
  maple 
  and 
  bird's-eye 
  maple 
  used 
  in 
  

   cabinet 
  making.* 
  

  

  2. 
  A. 
  saccharinum 
  L. 
  WHITE 
  MAPLE, 
  RIVKH 
  MAPLE. 
  A 
  tall 
  

   tree 
  with 
  the 
  main 
  branches 
  .slimier 
  and 
  rather 
  erect. 
  Leaves 
  very 
  

   deeply 
  5-lobeu, 
  with 
  the 
  notches 
  rather 
  acute, 
  silvery-white, 
  and 
  when 
  

   young 
  downy 
  on 
  the 
  lower 
  surface, 
  the 
  divisions 
  narrow, 
  coarsely 
  

   cut 
  and 
  toothed. 
  Flowers 
  greenish, 
  in 
  umbel-like 
  clusters, 
  appearing 
  

   long 
  before 
  the 
  leaves. 
  Petals 
  absent. 
  Fruit 
  woolly 
  at 
  first, 
  then 
  

   smooth, 
  with 
  diverging 
  wings, 
  the 
  whole 
  2-3 
  in. 
  long. 
  Common 
  on 
  

   river 
  banks 
  S. 
  and 
  W., 
  also 
  planted 
  for 
  a 
  shade 
  tree, 
  but 
  not 
  safe, 
  

   as 
  the 
  branches 
  are 
  easily 
  broken 
  off 
  by 
  the 
  wind. 
  

  

  3. 
  A. 
  rubrum 
  L. 
  RED 
  MAPLE. 
  A 
  small 
  tree 
  with 
  red 
  or 
  purple 
  

   twigs. 
  Leaves 
  simple, 
  broadly 
  ovate, 
  palmately 
  3-5-lobed 
  or 
  some- 
  

   times 
  merely 
  serrate 
  or 
  cut-toothed, 
  taper-pointed 
  at 
  the 
  apex, 
  

   rounded 
  or 
  heart-shaped 
  at 
  the 
  base, 
  smooth 
  or 
  downy, 
  becoming 
  

   bright 
  red 
  in 
  autumn. 
  Flowers 
  appearing 
  before 
  the 
  leaves 
  on 
  erect, 
  

   clustered 
  pedicels. 
  Petals 
  red 
  or 
  yellow, 
  oblong 
  or 
  linear. 
  Fruiting 
  

   pedicels 
  elongated 
  and 
  drooping. 
  Key 
  red, 
  smooth, 
  wings 
  about 
  an 
  

   inch 
  long. 
  Swamps 
  and 
  river 
  banks 
  E.* 
  

  

  4. 
  A. 
  Pseudo-Platanus 
  L. 
  SYCAMORE 
  MAPLE. 
  Easily 
  recognized 
  

   by 
  its 
  drooping 
  dusters 
  of 
  rather 
  large 
  green 
  flowers, 
  which 
  appear 
  

   with 
  the 
  leaves. 
  Cultivated 
  from 
  Europe. 
  

  

  5. 
  A. 
  platanoides 
  L. 
  NORWAY 
  MAPLE. 
  A 
  large 
  tree, 
  with 
  milky 
  

   sap, 
  \\hich 
  exudes 
  from 
  broken 
  shoots 
  or 
  leafstalks 
  in 
  the 
  spring. 
  

   Cultivated 
  from 
  Europe; 
  a 
  very 
  desirable 
  shade 
  tree. 
  

  

  6. 
  A. 
  Negundo 
  L. 
  Box 
  ELDER. 
  A 
  small 
  tree. 
  Leaves 
  opposite, 
  

   pinnately 
  3-5-foliate; 
  leaflets 
  ovate, 
  lobed, 
  toothed 
  or 
  entire, 
  downy 
  

   when 
  young. 
  Flowers 
  ilio>cious, 
  appearing 
  from 
  lateral 
  buds 
  before 
  

   or 
  with 
  the 
  leaves; 
  the 
  staminate 
  on 
  long 
  and 
  drooping 
  pedicels, 
  

   the 
  pistillate 
  in 
  drooping 
  racemes. 
  Keys 
  smooth, 
  1-1 
  1 
  in. 
  long. 
  

   River 
  banks. 
  Often 
  cultivated 
  as 
  a 
  quick-growing 
  shade 
  tree.* 
  

  

  60. 
  HIPPOCASTANACEJE. 
  BUCKEYE 
  FAMILY 
  

  

  Trees 
  or 
  shrubs. 
  Leaves 
  opposite, 
  long-petioled, 
  palmately 
  

   compound. 
  Flowers 
  showy, 
  somewhat 
  monoecious, 
  in 
  termi- 
  

   nal 
  panicles. 
  Calyx 
  5-lobed, 
  oblique. 
  Petals 
  4-5, 
  unequal. 
  

   Stamens 
  5-8, 
  hypogynous. 
  Pistil 
  1 
  ; 
  ovary 
  3-celled, 
  2 
  ovules 
  

   in 
  each 
  cell 
  ; 
  style 
  slender. 
  Fruit 
  a 
  1-3-celled, 
  leathery 
  cap- 
  

   sule, 
  1-3-seeded. 
  Seeds 
  with 
  a 
  large 
  scar.* 
  

  

  