Greer: Devoted to Allergy Immunotherapy

Allergenic Weeds of Southern 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 weeds pollinate in the fall.

Coastal Inland Empire Central Valley Low Desert
  Monterey Co Sta Barbara Co Los Angeles Co San Diego Co   San Bernardino Co Riverside Co   Fresno Kern Co   Imperial Co
Cross-Reactive Weeds 1                        
202: Allscale   x x x   x x   x x   x
240: Lenscale/Quailbrush x x x x   x x   x x   x
206: Wingscale : Click for botanical profile   x x x   x x     x   x
                         
49: Palmer's Amaranth   x   x   x x     x   x
32: Careless Weed   x   x                
52: Pigweed, Rough/Redroot : Click for botanical profile x x x x     x     x    
40: Hemp, Water   x   x                
                         
35: Dock, Yellow/Curly : Click for botanical profile x x x x   x x     x    
64: Sorrel, Sheep/Red : Click for botanical profile x x x x   x x   x x    
                         
Jerusalem Oak x x x     x     x x    
43: Lamb's Quarter : Click for botanical profile x x x x   x x     x   x
Mexican Tea x x x x   x x   x x    
                         
48: Mugwort, Darkleaved : Click for botanical profile     x x   x x   x x    
Wormwood, Annual                 x x    
268: Sagebrush, Coast : Click for botanical profile x x x x     x   x x    
61: Sagebrush, Common : Click for botanical profile   x x x   x x   x x    
                         
272: Ragweed, Desert : Click for botanical profile       x   x x     x   x
185: Ragweed, False : Click for botanical profile x x x x   x x   x x    
55: Ragweed, Giant : Click for botanical profile x                      
56: Ragweed, Short : Click for botanical profile   x x                  
50: Ragweed, Slender x x x x   x            
58: Ragweed, Western : Click for botanical profile x x x x   x x          
                         
Other Weeds                        
                         
225: Baccharis : Click for botanical profile x x x x   x x   x x   x
213: Burrobrush : Click for botanical profile   x x x   x x     x   x
33: Cocklebur : Click for botanical profile x x x x   x x   x x   x
37: Goldenrod 3 : Click for botanical profile x x x x   x x   x x   x
212: Iodine Bush : Click for botanical profile x   x   x x   x x   x
42: Kochia/Firebush : Click for botanical profile x x x x               x
36: Nettle : Click for botanical profile x x x x   x x   x x    
54: Plantain, English : Click for botanical profile x x x x   x x     x    
Poverty Weed x x x x   x x   x x    
59: Russian Thistle : Click for botanical profile x x x x   x x     x    

Data obtained from USDA Plants Database.


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

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