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Redtop seedhead

Plants that are allergenic or that cause dermatitis or mechanical injury are annoying, but the victim usually recovers. Wind-blown pollen generated by trees, grass, plants, and weeds can cause airbone allergies to some people. For the 40-50 million allergy sufferers in America, inhaling airborne allergens can produce a variety of allergic symptoms and because pollen grains are small and buoyant, they can remain airborne for hundreds of miles.

The following is a partial list of weeds that may cause allergic reactions:

Amaranth, pigweed Amaranthus spp.
Annual bluegrass Poa annua L.
Barnyardgrass Echinochloa crus-galli (L.) Beauv.
Bermudagrass Cynodon dactylon (L.) Pers.
Brome Bromus spp.
Buffalograss Buchloe dactyloidos (Nutt.) Engelm.
Canarygrass Phalaris spp.
Cheat Bromus secalinus L.
Cocklebur Xanthium spp.
Dallisgrass Paspalum dilatatum Poir.
Dandelion Taraxacum spp.
Dock Rumax spp.
Foxtail Setaria spp.
Goatgrass Aegilops spp.
Hemp Cannabis sativa L.
Johnsongrass Sorghum halepense (L.) Pers.
Kochia Kochia scoparia (L.) Schrad.
Lambsquarters Chenopodium spp.
MarsheIder Iva xanthifolia Nutt.
Nettle Urtica spp.
Orchardgrass Dactylis glomerata L.
Plantain Plantago spp.
Quackgrass Agropyron ripens (L.) Beauv.
Red sorrel Rumex acetosella L.
Redtop Agrostis albaL.
Russian thistle Salsoli kali L.
Ryegrass Lolium multiflorum Lam.
Sagebrush Artemisia spp.
Saltbrush Atriplex spp.
Saltgrass Distichlis spicata (L.) Greene
Sudangrass Sorghum sudanense (Piper) Stapf
Velvetgrass, common Holcus lanatus L.
Wormwood Artemisia spp.

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