Southwestern United States
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in the Southwest
Plants Known to Produce Allergenic Pollen in Southern Arizona
Key to recognition of allergenic plants
(for pictures, click the links)
Grasses and Weeds Trees and shrubs
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| Common Name | Latin Name | Flowering Period (Tucson) | Comments |
| Grasses | |||
| Bermuda Grass | Cynodon dactylon | June-Sept | Commonly used in parks, sport fields, a weed in dirt alleys. Nonflowering hybrids available |
| Grama Grass | Bouteloua | May-Oct | Several native species. A common urban and rural weed |
| Johnson Grass | Sorghum halepense | May-Dec | Grows in washes |
| Rye Grass | Lolium | March-Oct | Allergens common to most other grasses |
| Buffel Grass | Pennisetum ciliare | Perennial | Common, invasive weedy grass, similar to Fountain Grass |
| Weeds | |||
| Alfalfa | Medicago sativa | March-June | Cultivated for forage. Blue-violet flowers |
| Burrobrush | Hymenoclea salsola | March-April | |
| Bursage, Slimleaf | Ambrosia confertiflora | April-Nov | Synonym for Ambrosia confertiflora is A. tenuifolia (Slender Ragweed) |
| Bursage, Triangle-leaf | Ambrosia deltoidea | Dec-April | A type of ragweed. Prolific pollen producer. Also known as Rabbit Bush |
| Carelessweed | Amaranthus palmeri | April-Oct | A type of pigweed |
| Cocklebur | Xanthium strumarium | August, Sept | Large broad leaves, ovoid burs 1/2-1 in long |
| Iodine Bush | Allenrolfea occidentalis | July-Nov | Mainly in alkaline salt flats and plains of Sagebrush and Mojavean Deserts, Gila and Little Colorado River drainage. Pickleweed, chico. Shrub up to 3 ft high |
| Lambsquarters | Chenopodium album | May-Oct | Widespread throughout N. America |
| Ragweed, Canyon | Ambrosia ambrosioides | July-Oct | Leaves 3-5 in long |
| Ragweed, Desert | Ambrosia dumosa | May-Nov | White bursage. Throughout Sonoran Desert. Shrub 2 ft high, leaves 3/4 in long |
| Russian Thistle | Salsola kali | May-Nov | Widespread throughout N. America. Also known as Tumbleweed |
| Sagebrush | Artemisia ludoviciana | August-Nov | |
| Saltbush, Scale | Atriplex spp | Oct-April | Wingscale, Wheelscale and several other species of Atriplex found in the region |
Disclaimer: This site is for educational purposes only. Any information that you have found in this web site is not intended to replace medical care or advice given to you by your own physicians. You should consider consulting your local medical library and other web sites for additional information.
Comments and suggestions welcome! Email: schumach@u.arizona.edu
Content Owner: Michael J. Schumacher, MB, FRACP, The
University of Arizona
Updated 8/2008