The type of pollen that most commonly causes allergy symptoms comes from plants (trees, grasses, and weeds) that typically do not bear fruit or flowers. These plants produce small, light, dry pollen granules in large quantities that can be carried through the air for miles.
Common plant allergens include:
Weeds, such as western ragweed, slender ragweed, false ragweed, sagebrush, wingscale, lenscale, lamb’s quarters, iodine bush, tumbleweed (russian thistle), pigweed, saltbush, careless weed, marsh elder, burrobrush, baccharis, mugwort, cocklebur, kochia and english plantain.
Grasses, such as canary grass, ky/june grass, johnson grass, bermuda grass, meadows fescue grass, bahia grass and rye grass.
Trees, such as mountain juniper, chinese elm, fremont cottonwood, sycamore, arizona ash, mulberry, willow, lombardy poplar, acacia, olive, arizona cypress, gamble oak, privet, mesquite and pine mix.