For  the  present  purpose  it  will  be  sufficient  to  speak  of  grasshopper
group,  beetle  group,  butterfly  group,  crayfish  group,  crab  group,  etc.,
leaving  the  technical  names  of  these  until  later  lessons.
For  plant  classification,  a  set  of  leaves,  fruits,  branches,  bark,
etc.,  of  two  or  more  species  of  some  common  plants,  e.g.,  oaks,
maples,  or  others  available.  In  the  spring  of  the  year,  members  of
the  rose  family  (apple,  pear,  peach,  plum,  cherry,  quince,  wild  rose,
etc.)  will  furnish  some  interesting  materials  for  classification;  and
in  the  autumn  there  are  many  composites  which  might  be  used  in
the  same  way.
132.  Learning  Scientific  Names.  —  It  is  not  necessary  that
all  the  technical  names  given  in  the  following  tables  of  classi-
fication be  memorized  at  one  time.  The  best  way  to  leam
them  is  through  use.  Only  the  more  important  names  have
been  given,  and  many  of  them  are  rapidly  becoming  com-
mon terms.  In  fact,  few  people  realize  that  many  common
names  are  also  the  scientific  ones.  For  example,  among
common  plants  grown  in  home  gardens :  asparagus,  spinacia
(spinach),  aster,  alyssum,  calendula,  centaurea  (sometimes
called  bachelor's  button),  chrysanthemum,  phlox,  crocus,
cosmos,  iris,  smilax,  narcissus  (sometimes  called  daffodil),
tulipa  (tulip),  hyacinthus  (hyacinth),  yucca,  lilium  (lily),
viola  (violet),  petunia,  portulaca,  salvia,  thymus  (thyme),
zinnia,  verbena,  heliotropum  (heliotrope),  —  all  these  and
many  more  are  the  scientific  names  of  the  genus  in  each
case;  but  since  for  most  of  these  plants  there  is  no  common
name,  the  scientific  name  has  become  also  the  conmion  one.
