Stallergenes Greer

Allergenic Weeds of District of Columbia


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.

                Western Shore
  Rockville   Baltimore   VA Suburbs   District Of Columbia   Annapolis Waldorf
                     
Cross-Reactive Weeds 1                    
                     
32: Careless Weed x   x   x   x   x x
52: Pigweed, Rough/Redroot : Click for botanical profile x   x   x   x   x x
53: Pigweed, Spiny : Click for botanical profile x   x   x   x   x x
                     
35: Dock, Yellow : Click for botanical profile x   x   x   x   x x
64: Sorrel, Sheep/Red : Click for botanical profile x   x   x   x   x x
                     
55: Ragweed, Giant : Click for botanical profile x   x   x   x   x x
56: Ragweed, Short : Click for botanical profile x   x   x   x   x x
                     
Other Weeds                    
                     
225: Baccharis : Click for botanical profile         x   x   x x
33: Cocklebur : Click for botanical profile x   x   x   x   x x
43: Lamb's Quarter : Click for botanical profile x   x   x   x   x x
47: Mugwort, Common : Click for botanical profile x   x   x   x   x x
36: Nettle : Click for botanical profile x   x   x   x   x  
54: Plantain, English : Click for botanical profile x   x   x   x   x x
59: Russian Thistle : Click for botanical profile         x   x    

* Arlington and Fairfax Counties

Data obtained from USDA Plants Database.


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

 

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