O - R
The Olive tree is the oldest known cultivated tree in the history of the world. It originated in Africa over 5,000 years ago.
P. notatum (aka P. chrysogenum) is one of the most common indoor molds. P. notatum does occur outdoors as well, but it is certainly one of the most important indoor mold allergens.
Also called English Ryegrass, Perennial Ryegrass has been naturalized worldwide. Used agronomically for foraging and as a grass for pastures and farms, this grass utilized in landscaping and on gold greens for its hardiness to frost and capacity to rejuvenate (although other grasses are preferable to heat).
Contaminant / opportunistic pathogen, found on plant material and soil. Reported to be a common allergen found indoors on painted walls (including the shower) and on a variety of other surfaces including cement, rubber, and butter
A composite of allergens three greatest offenders of the Pine family, the white, loblolly and shortleaf pines are some for the tallest most common and greatest pollen producing tees in the U.S.
This South American Palm is often used in commercial or home landscaping due to its stately appearance.
Red Cedar, also known by the common names Eastern Red Cedar and Red Cedar Juniper, is found throughout the eastern two- thirds of the US, as well as in Oregon.
Moderately allergenic, these trees typically flower either in late winter or early spring and cover nearly the entire continental U.S. The best course of action would be to check local pollen levels during the aforementioned pollinating season.
Red Oak, also known as Northern or Common Red Oak, can be found in most of the eastern half of the US, except for the deep south. It is a large tree, reaching heights of over 100 feet.