Greer: Devoted to Allergy Immunotherapy

Allergenic Trees of Northern California


Pollen allergens with hyperlinks are available in GREER's catalog. Click on the allergen that you are interested in and connect with that item in GREER's catalog.

To learn more about a particular pollen allergen, click on the PDF icon [PDF] of that allergen. These botanical profiles are available for download and include a detailed profile, genus/species and family, location(s) found in the United States and photograph(s) of the pollen.


Marked Cells () signify taxon present in area. Unmarked Cells signify taxon absent in area or unconfirmed.

1 Cross-reactive species grouped together in colored cells
2 Italicized species demonstrate only moderate cross-reactivity with other(s) in the group
3 This species is insect-pollinated

Most trees pollinate in the spring.

Coastal Klamath/Coast Ranges Central Valley Sierra/Great Basin
  Crescent City Eureka San Francisco   Yreka Clearlake Ukiah   Redding Sacramento Modesto   Truckee Alturas Bishop
                               
Cross-Reactive Trees 1                              
                               
217: Alder, Red : Click for botanical profile x x x                        
438: Alder, White : Click for botanical profile   x     x x x   x x          
Birch, Water   x x   x         x       x x
                               
73: Ash, Oregon : Click for botanical profile x x x   x x x   x x x        
123: Olive : Click for botanical profile     x   x x     x x x        
                               
82: Box Elder : Click for botanical profile     x     x x     x          
Maple, Coast/Bigleaf   x x             x          
                               
75: Aspen : Click for botanical profile         x               x x  
444: Cottonwood, Black : Click for botanical profile x x     x               x x x
255: Cottonwood, Fremont : Click for botanical profile   x x     x x   x x x   x x x
483: Willow, Arroyo 2 : Click for botanical profile x x x   x x x   x x x   x x x
Willow, other x x x   x x x   x x x   x x x
                               
Cypress, other     x   x       x x x        
233: Juniper, Utah : Click for botanical profile                         x   x
254: Juniper, Western : Click for botanical profile         x               x x x
Juniper, other     x           x   x     x  
                               
284: Oak, California Black : Click for botanical profile   x x   x x x   x       x x x
195: Oak, California Live : Click for botanical profile     x     x                  
455: Oak, Calif. White/Valley : Click for botanical profile           x x   x x x        
285: Oak, Western White : Click for botanical profile     x   x x x   x            
Oak, other x x x   x x x   x x     x    
                               
478: Pine, Ponderosa : Click for botanical profile         x x x   x       x x  
480: Pine, Western White : Click for botanical profile x       x               x    
Pine, other x x x   x x x   x x x   x x x
                               
Walnut, native Calif.     x             x          
210: Walnut, English : Click for botanical profile     x     x x   x x x        
                               
Other Trees                              
                               
172: Acacia 3 : Click for botanical profile x x x       x     x x        
93: Elm, Siberian : Click for botanical profile     x             x         x
196: Eucalyptus 3 : Click for botanical profile     x     x x   x x x        
194: Mulberry, White : Click for botanical profile     x             x x     x  
Palm, other     x       x     x x        
479: Russian Olive : Click for botanical profile                           x x
228: Sycamore, Western : Click for botanical profile                 x x x        
242: Tamarisk/Salt Cedar 3 : Click for botanical profile                             x

Data obtained from USDA Plants Database ; USDA-FS Silvics of North America


For current pollen counts visit www.pollen.com or enter a zip code below.

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