﻿146 
  

  

  INTRODUCTION 
  TO 
  BOTANY 
  

  

  of 
  the 
  evening 
  primroses, 
  honeysuckles, 
  and 
  Jimson 
  weeds 
  

   (fig. 
  131). 
  The 
  nectar 
  from 
  such 
  flowers 
  can 
  best 
  be 
  reached 
  

   by 
  insects 
  with 
  a 
  very 
  long 
  proboscis, 
  like 
  that 
  of 
  the 
  butter- 
  

   Hies 
  or 
  the 
  hawk 
  moths 
  (fig. 
  131). 
  Many 
  flowers 
  with 
  long 
  

   corolla 
  tubes 
  are 
  also 
  visited 
  by 
  humming 
  birds. 
  

  

  Red-clover 
  flowers 
  are 
  pollinated 
  

   mainly 
  by 
  bumblebees. 
  What 
  effect 
  

  

  n 
  

  

  pr 
  

  

  FIG. 
  130. 
  A 
  , 
  head 
  of 
  cab- 
  

   bage 
  butterfly; 
  I>, 
  head 
  

   of 
  honeybee 
  

  

  a, 
  antennae; 
  pr, 
  proboscis, 
  

   or 
  sucking 
  origin. 
  The 
  pro- 
  

   boscis 
  of 
  the 
  butterfly 
  is 
  

   represented 
  us 
  coiled 
  into 
  

   a 
  spiral. 
  Both 
  somewhat 
  

  

  !li:i'_;liilied. 
  After 
  llehreus 
  

  

  Fi;.181. 
  Pollination 
  of 
  flower 
  of 
  Jimson 
  

   weed 
  (Datura) 
  by 
  a 
  hawk 
  moth 
  

  

  The 
  nectar 
  is 
  inaccessible 
  to 
  ordinary 
  insects 
  

  

  upon 
  the 
  crop 
  of 
  clover 
  seed 
  have 
  field 
  mice, 
  which 
  destroy 
  

   the 
  nests 
  of 
  bumblebees? 
  How 
  would 
  red 
  clover 
  thrive 
  if 
  

   introduced 
  into 
  a 
  country 
  where 
  there 
  were 
  no 
  bumblebees? 
  

   139. 
  The 
  arum 
  ; 
  a 
  pitfall 
  flower 
  cluster. 
  Our 
  common 
  jack- 
  

   in-the-pulpit 
  is 
  the 
  most 
  familiar 
  American 
  member 
  of 
  the 
  

   great 
  (mostly 
  tropical) 
  Arum 
  family. 
  The 
  over-arching 
  hood 
  

   and 
  the 
  tube 
  from 
  which 
  it 
  springs 
  inclose 
  a 
  club-shaped 
  

   axis 
  on 
  which 
  are 
  borne 
  many 
  inconspicuous 
  flowers. 
  

  

  