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2. Ptelea trifoliata - Wikipedia

   en.wikipedia.org/wiki/Ptelea_trifoliata

   Ptelea trifoliata, commonly known as common hoptree, [4] wafer ash, [5] stinking ash, [6] [7] and skunk bush, [7] [8] is a species of flowering plant in the citrus family . It is native to North America, where it is found in Canada, Mexico, and the United States. It is a deciduous shrub or tree, [9] [10] with alternate, trifoliate leaves.

3. The pollening is coming. What to know about this allergy season.

   www.aol.com/pollening-coming-know-allergy-season...

   The three pollen seasons: Trees, grass and weeds A birch tree in the spring forms pollen seen here. Pollen can be broken down in to three categories depending on where it comes from - tree, grass ...

4. List of pollen sources - Wikipedia

   en.wikipedia.org/wiki/List_of_pollen_sources

   The plants listed below are plants that would grow in USDA Hardiness zone 5. A good predictor for when a plant will bloom and produce pollen is a calculation of the growing degree days. The color of pollen below indicates the color as it appears when the pollen arrives at the beehive.

5. Fraxinus nigra - Wikipedia

   en.wikipedia.org/wiki/Fraxinus_nigra

   Image of black ash trunk. Tree is located in a seasonally wet, riparian habitat near a small-scale stream. Tree bark is corky and spongy. Black ash is a medium-sized deciduous tree reaching 15–20 metres (49–66 ft) (exceptionally 26 metres (85 ft)) tall with a trunk up to 60 cm (24 inches) diameter, or exceptionally to 160 cm (63 inches).

6. AccuWeather's 2023 US spring allergy forecast - AOL

   www.aol.com/weather/accuweathers-2023-us-spring...

   Tree pollen is expected to be the worst in the Pacific Northwest this year. For allergy sufferers living in this region, limiting the amount of time spent outside this spring may be a good idea.

7. Zanthoxylum americanum - Wikipedia

   en.wikipedia.org/wiki/Zanthoxylum_americanum

   Zanthoxylum americanum, the common prickly-ash, common pricklyash, common prickly ash or northern prickly-ash (also sometimes called toothache tree, yellow wood, or suterberry), is an aromatic shrub or small tree native to central and eastern portions of the United States and Canada.