First of all please check out Victory Gardens for Bees by Lori Weidenhammer available through the library.  This is a great resource covering most of our pollinating bees, including the honey bee.  I have developed a presentation on this subject to be delivered at a future COBKA monthly meeting.  It is based on my own personal experience in my garden and my Master Gardener based knowledge of what plants work well in Central Oregon.  This spring and summer please visit the OSU Demonstration Garden at the OSU Extension Office at the fairgrounds in Redmond to see real life bee plants in action. 
In the meantime, here's my list of bee friendly Central Oregon plants and trees:
  
    
      | 
         Borage 
        Black-eyed Susan 
        Calendula 
        California Poppy 
        Catmint 
        Coneflower 
        Cornflower 
        Desert Sweet 
        Gaura 
        Crocus 
        Lacy Phacelia 
        Lavender
  
       | 
      Lemon Queen Sunflower 
      Lewis Flax 
      Milkweed 
      Purple Prairie Clover 
      Rocky Mt. Bee Plant 
      Rocky Mt. Penstemon 
      Russian Sage 
      Salvia 
      Sea Holly 
      Veronica Speedwell 
      Wild Bee Balm 
      Mountain Hollyhock 
      Yarrow 
      Zinnias | 
      Chokecherry 
      Flowering Crabapple 
      Apple 
      Pear 
      Linden 
      Serviceberry 
      Vine Maple | 
    
  
If I were to only have one plant in my garden for bees it would be Borage.  Its flowers refresh their nectar every five minutes during the day.  The only caution is this plant can spread easily so care must be taken to contain it.  Raised beds work great for that.  I am sure others have favorite plants that work as well.  Have fun planting.