﻿PINE 
  FAMILY 
  

  

  15 
  

  

  4. 
  P. 
  virginiana 
  Mill. 
  SCRUB 
  PINE. 
  A 
  small 
  tree, 
  usually 
  20-30 
  ft. 
  

   high, 
  but 
  sometimes 
  much 
  taller; 
  bark 
  of 
  the 
  trunk 
  rough, 
  nearly 
  

   black 
  ; 
  twigs 
  smooth 
  and 
  with 
  a 
  bloom. 
  Leaves 
  in 
  twos, 
  1-2 
  in. 
  

  

  ^^m' 
  S'.3rJ*sm=^-l 
  

  

  FIG. 
  1. 
  Scotch 
  pine 
  (Pinus 
  sylvestris) 
  

  

  1, 
  a 
  twig 
  showing: 
  a, 
  staminate 
  catkins; 
  6, 
  pistillate 
  catkins; 
  c, 
  a 
  cone; 
  d, 
  

   needles. 
  2, 
  an 
  anther 
  : 
  a, 
  side 
  view 
  ; 
  6, 
  outer 
  surface. 
  3, 
  a 
  carpel 
  scale 
  : 
  

   a, 
  inner 
  surface 
  ; 
  6, 
  outer 
  surface. 
  4, 
  a 
  a 
  cone 
  scale, 
  b 
  a 
  seed 
  wing, 
  and 
  

   c 
  a 
  seed. 
  5, 
  section 
  of 
  a 
  seed, 
  showing 
  the 
  emhryo. 
  1 
  is 
  natural 
  size 
  ; 
  

   parts 
  2, 
  3, 
  and 
  5 
  are 
  magnified 
  by 
  the 
  amount 
  indicated 
  by 
  comparison 
  

   with 
  the 
  vertical 
  line 
  alongside 
  each. 
  (After 
  Wossidlo) 
  

  

  long, 
  rigid, 
  sheaths 
  very 
  short. 
  Staminate 
  catkins 
  dull, 
  yellowish- 
  

   purple, 
  1 
  in. 
  long. 
  Cones 
  solitary, 
  short-peduncled, 
  often 
  reflexed, 
  

   ellipsoid-conic, 
  about 
  2 
  in. 
  long; 
  scales 
  thickened 
  at 
  the 
  apex 
  and 
  

  

  