﻿ACADEMY 
  OF 
  SCIENCES. 
  289 
  

  

  2. 
  ^sculus 
  Californicus, 
  Nutt. 
  California 
  Buckeye. 
  

  

  3. 
  Cerasus 
  ilicifolia, 
  Nutt. 
  Hollyleaved 
  Plum. 
  

  

  4. 
  Pliotinia 
  arbutifolia, 
  Lindl. 
  Photinia 
  Laurel. 
  

  

  5. 
  Arbutus 
  Menziesii, 
  Pursh. 
  Madrona. 
  

  

  6. 
  Sambucus 
  glauca, 
  Nutt. 
  Blueberried 
  Eider. 
  

  

  7. 
  Oreodaphne 
  Californica, 
  Nees. 
  California 
  Bay 
  Tree. 
  

  

  8. 
  Quercus 
  agrifolia, 
  Nees. 
  Hollyleaved 
  Live 
  Oak. 
  

  

  9. 
  Alnus 
  viridis, 
  D. 
  C. 
  Alder. 
  

  

  10. 
  Salix 
  lucida, 
  Muhl. 
  Sbining 
  Willow. 
  

  

  IL 
  Salix 
  longifolia, 
  Muhl. 
  Longleaved 
  Willow. 
  

  

  12. 
  Salix 
  lasiolepis, 
  Beuth. 
  Wooly-scaled 
  Willow. 
  

  

  13. 
  Salix 
  brachystachys, 
  Beuth. 
  Shortspiked 
  Willow. 
  

  

  14. 
  Populus 
  monilifera, 
  Ait. 
  Cottonwood. 
  

  

  15. 
  Tsuga 
  Douglassii, 
  Lindl. 
  Red 
  Fir. 
  

  

  Group 
  II.— 
  Found 
  from 
  ten 
  to 
  twenty 
  miles 
  from 
  the 
  center 
  of 
  San 
  Francisco 
  

   county 
  : 
  

  

  16. 
  Vitis 
  Californica, 
  Benth. 
  California 
  Grape. 
  

  

  17. 
  Acer 
  macrophyllum, 
  PwrsA. 
  Large-leaved 
  Maple. 
  

  

  18. 
  Negundo 
  aceroides, 
  Manch. 
  Box 
  Elder. 
  

  

  19. 
  Fraxinus 
  Oregonus, 
  Nutt. 
  Oregon 
  Ash. 
  

  

  20. 
  Platanus 
  racunosa, 
  Nutt. 
  Sycamore. 
  

  

  21. 
  Quercus 
  Gambelii, 
  Nutt. 
  Upland 
  White 
  Oak. 
  

  

  22. 
  Quercus 
  densiflora, 
  Hook. 
  Tan-bark 
  Oak. 
  

  

  23. 
  Castanea 
  chrysophylla, 
  Dougl. 
  California 
  Chestnut. 
  

  

  24. 
  Pifius 
  tuberculata, 
  Don. 
  Tubercled 
  Pine. 
  

  

  25. 
  Cupressus 
  Macnabiana, 
  Murr. 
  Tamalpais 
  Cypress. 
  

  

  Of 
  these 
  ten, 
  only 
  two 
  are 
  broad-leaved 
  evergreens, 
  and 
  two, 
  coniferse, 
  indi- 
  

   cating 
  increased 
  additions 
  from 
  northern 
  families 
  ; 
  all 
  of 
  them 
  belong 
  to 
  the 
  

   mountainous 
  districts, 
  except, 
  perhaps, 
  the 
  Ash, 
  a 
  rare 
  tree 
  in 
  this 
  region. 
  

  

  Group 
  IIL— 
  Found 
  twenty 
  to 
  thirty 
  miles 
  from 
  the 
  center 
  of 
  San 
  Francisco 
  

   county 
  : 
  

  

  26. 
  Juglans 
  rupestris, 
  Engl. 
  California 
  Walnut, 
  

  

  27. 
  Quercus 
  Sonomeusis, 
  Beutli. 
  Black 
  Oak. 
  

  

  28. 
  Quercus 
  lobata, 
  Nees. 
  Valley 
  White 
  Oak. 
  . 
  

  

  29. 
  Populus 
  trerauloides, 
  Mick. 
  American 
  Aspen. 
  

  

  30. 
  Pinus 
  muricata, 
  Don. 
  Bishop 
  Pine. 
  

  

  31. 
  Pinus 
  Sabiniana, 
  Dougl. 
  Digger's 
  Pine. 
  

  

  32. 
  Juniperus 
  occidentalis 
  ? 
  Western 
  Juniper. 
  

  

  33. 
  Torreya 
  Californica, 
  Torr. 
  California 
  Nutmeg. 
  

  

  Of 
  these, 
  all 
  are 
  deciduous, 
  except 
  the 
  conifers, 
  and 
  Ire 
  also 
  mountain 
  trees. 
  

   Three 
  are 
  confined 
  to 
  the 
  drier 
  eastern 
  ranges; 
  one 
  to 
  the 
  moist 
  coast 
  range; 
  

   and 
  the 
  Aspen 
  is 
  a 
  rare 
  straggler 
  from 
  the 
  north. 
  

  

  