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Allergy Info Sheets

Bermuda GrassThis grass, which is native to the savannas of eastern Africa, has been introduced and established in much of the world, including Bermuda from where it is thought to have been brought to the United States.
Johnson GrassJohnson grass is a rather large perennial grass introduced from the Mediterranean region that is related to the commercially-grown sorghum.
Sweet Vernal GrassThis grass, which is native to the Old World, grows to be some 30 to 60 cm (about 12 to 24 inches) tall, and has rather dense flower heads (but typically less than 3 inches in length) that open somewhat when anthers are exposed. It blooms rather early in the spring.
Cocklebur PlantThis species may grow to be over four feet tall in a variety of waste places and disturbed areas, especially those that are moist.
Nettle PlantNettle is a perennial herbaceous plant that forms colonies on floodplains, riverbanks and other moist places, and introduced populations complement native ones.
Red Sorrel or Sheep Sorrel PlantThis small plant makes its appearance in early spring, and is seldom much more than a foot in height.
Lambs Quarter PlantThis annual plant is regarded as an introduction from Europe (where it is called Fat Hen) although there may be native populations.
Yellow or Curly Dock PlantThis common perennial weed makes its appearance in early spring, and its typically- unbranched flowering stem or stalk may grow to be over five feet tall.
Burweed Marsh Elder or Giant Poverty WeedThis species is a common plant along roadsides, cultivated fields or along streams in much of the central part of the US.
Common Mugwort WeedThis is a common introduced weed of roadsides and cultivated areas, and its range may be expanding.
English Plantain WeedThis is a common weed of lawns and roadsides.
Firebush or Kochia WeedThis species was introduced to America from Eurasia as an ornamental because of its bright red autumn coloration (and sometimes called “burning bush”), and it has found some use as a forage crop in dry areas of the Plains and the Southwest although it becomes toxic to livestock if it comprises too great a portion of the diet.
Giant RagweedThis impressive native annual weed can grow to be over 4 m tall. It is especially abundant in wet areas such as sandbars along rivers.
Rough or Redroot PigweedThis weed is an annual species that reproduces by seed and may establish itself aggressively in cultivated fields.
Russian Thistle WeedThis annual weed is also known as Tumbleweed because the dried plants, a symbol of the American West, typically break away at the base and get blown about by the wind, spreading their seeds.
Short Ragweed WeedThis species is the “king” of allergenic plants, being the most important for allergy in America and the most widespread among several species of ragweed.
American Elm TreeThe American Elm is a very widespread medium-sized or large tree typically found in floodplains, ravines and other moist areas, often following rivers far westward into otherwise mostly treeless areas.
Black Oak TreeBlack Oak is an eastern species typically found in rather dry soils such as those on sunny hillsides and ridges.
Black or Sweet BirchThis birch is one of a few having a distinct “wintergreen” scent to its twigs when broken, and birch beer was made from its sap.
Box Elder TreeBox Elder is the only native maple having compound leaves, so it is sometimes not recognized as a maple.
Eastern Cottonwood TreeThere is some disagreement as to the western border of the range of this species because of the status and distinctness of the closely-related plains cottonwood.
Eastern or American Sycamore TreeEastern Sycamore is a common tree in flood plains along rivers but occasionally grows in drier areas in disturbed soil.
Eastern Red Cedar TreeThis species is found in a variety of habitats, especially open areas underlain by limestone.
Red or River Birch TreeThis is the only birch native to lowland areas of the southeastern US, and it is typically found in wet areas such as floodplains of rivers and streams.
Red Mulberry TreeThis is the only native mulberry throughout its range except for the extreme southwestern part.
Red Oak TreeRed Oak, also known Northern Red Oak, is an eastern species typically found in deep, fine soils found in valleys and protected slopes.
White Ash TreeWhite Ash is a very widespread species typically found in moist areas near streams or on slopes.
White Birch TreeThis birch, also known as Gray Birch, is a small tree that easily establishes itself and grows well in poor soils, often in pine barrens.
White Hickory TreeThis hickory has rather small hard nuts enclosed within thick husks, hence the other common name Mockernut Hickory.
White Oak TreeWhite Oak is a component of many kinds of forests, especially those that have moderately moist soil and have been allowed to mature over a long period of time.

 Siegel & Bosworth - Ear, Nose & Throat Center
15204 Omega Dr., Suite 310, Rockville, MD 20850
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