﻿COMPOSITE 
  FAMILY 
  249 
  

  

  large, 
  surrounded 
  by 
  a 
  whorl 
  of 
  linear-oblong, 
  comb-like 
  leaves 
  ; 
  in- 
  

   volucral 
  bracts 
  linear, 
  ciliate, 
  not 
  spine-tipped. 
  Flowers 
  purple 
  or 
  

   yellowish. 
  On 
  sandy 
  soil 
  E. 
  and 
  S.* 
  

  

  2. 
  C. 
  virginianum 
  Michx. 
  EARLY 
  WOOD 
  THISTLE. 
  Stem 
  woolly, 
  

   slender, 
  little 
  or 
  not 
  at 
  all 
  branched, 
  1-3 
  ft. 
  high. 
  Leaves 
  lanceolate, 
  

   green 
  above, 
  covered 
  beneath 
  with 
  dense 
  white 
  wool, 
  the 
  margins 
  

   beset 
  with 
  prickly 
  bristles, 
  entire 
  or 
  sinuate-lobed, 
  the 
  lower 
  ones 
  

   sometimes 
  pinnately 
  cut 
  into 
  triangular-lanceolate 
  lobes. 
  Heads 
  

   small, 
  purple, 
  on 
  long 
  leafless 
  peduncles 
  ; 
  outer 
  scales 
  of 
  the 
  involucre 
  

   merely 
  bristle-pointed. 
  In 
  dry 
  woods 
  and 
  thickets. 
  

  

  Xin. 
  CENTAUREA 
  L. 
  

  

  Herbs. 
  Leaves 
  entire 
  or 
  cut, 
  often 
  spiny-toothed. 
  Heads 
  

   single 
  ; 
  involucre 
  ovoid 
  or 
  globose 
  ; 
  bracts 
  closely 
  overlap- 
  

   ping, 
  often 
  fringed, 
  dry 
  and 
  membranaceous. 
  Corollas 
  all 
  tubu- 
  

   lar, 
  oblique 
  or 
  2-lipped, 
  inflated 
  above 
  ; 
  the 
  outer 
  ones 
  usually 
  

   larger 
  and 
  neutral, 
  the 
  inner 
  flowers 
  bisexual 
  ; 
  lobes 
  5, 
  slender. 
  

   Akenes 
  flattened 
  ; 
  pappus 
  hairs 
  short, 
  slender, 
  rough. 
  

  

  1. 
  Cyanus 
  L. 
  BACHELOR'S 
  BUTTON. 
  Stem 
  erect, 
  slender, 
  grooved, 
  

   1-2 
  ft. 
  high, 
  somewhat 
  branched. 
  Leaves 
  acute, 
  sessile, 
  narrow, 
  entire 
  

   or 
  few-lobed. 
  Peduncles 
  covered 
  with 
  cottony 
  wool. 
  Heads 
  i-1 
  in. 
  

   in 
  diameter, 
  cobwebby. 
  Ray-like 
  flowers 
  few, 
  large, 
  bright 
  blue 
  or 
  

   pink 
  ; 
  those 
  of 
  the 
  disk 
  smaller. 
  Cultivated 
  from 
  Europe 
  and 
  escaped 
  

   from 
  gardens. 
  

  

  2. 
  C. 
  americana 
  Nutt. 
  PRAIRIE 
  STAR 
  THISTLE. 
  Annual 
  ; 
  stem 
  

   etout, 
  little 
  or 
  not 
  at 
  all 
  branched, 
  2-6 
  ft. 
  high. 
  Leaves 
  entire 
  or 
  

   minutely 
  toothed, 
  the 
  basal 
  and 
  lower 
  ones 
  spatulate 
  or 
  oblong, 
  

   petioled, 
  the 
  upper 
  narrower, 
  sessile 
  and 
  mucronate. 
  Heads 
  solitary 
  

   at 
  the 
  summit 
  of 
  the 
  stem 
  or 
  tips 
  of 
  the 
  branches 
  ; 
  involucre 
  nearly 
  

   hemispherical, 
  the 
  bracts 
  ovate 
  or 
  lanceolate, 
  with 
  comb-like 
  ap- 
  

   pendages. 
  Flowers 
  pink 
  or 
  purple, 
  the 
  marginal 
  ones 
  ray 
  -like. 
  In 
  dry 
  

   plains, 
  especially 
  S.W. 
  

  

  II. 
  LIGULIFLOR^E 
  

   XTV. 
  CICHORIUM 
  L. 
  

  

  Perennial 
  herbs 
  with 
  spreading 
  branches 
  ; 
  juice 
  milky. 
  

   Leaves 
  radical 
  and 
  alternate, 
  toothed 
  or 
  pinnately 
  cut. 
  Heads 
  

   axillary 
  ; 
  involucre 
  cylindrical 
  ; 
  bracts 
  in 
  2 
  rows, 
  the 
  inner 
  

   row 
  erect, 
  united 
  at 
  the 
  base, 
  the 
  outer 
  shorter 
  ; 
  receptacle 
  

   flattish. 
  Corollas 
  blue, 
  pale 
  pink, 
  or 
  yellow. 
  Upper 
  part 
  of 
  

   the 
  style 
  and 
  its 
  slender 
  arms 
  hairy. 
  Akenes 
  crowded 
  on 
  the 
  

  

  