We often find elm pollen in our collections in low numbers even in early April. Prior to the mid-20th century, American Elm was often used as a landscape tree along streets. Allergenic extract contains the aqueous extractables from allergenic source material in extracting solution containing 0.25% sodium chloride, 0.125% sodium bicarbonate, and 50% glycerol. At the moment, research by our team is exclusively focused on American elm (U. americana) because that is the most widespread and common of the native North American elm species in both cities and in the wild. Some older trees are still found in isolated urban areas. Elm Family: Ulmaceae. on 4/12/2002. The 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. The protein source needed for rearing one worker bee from larval to adult stage requires approximately 120 to 145 mg of pollen. Other species of elm that flower in the late winter/early spring timeframe are U. americana (American elm) and U. rubra (slippery elm or red elm). Pollen Injection Description. There are several elm species native to northern Alabama but the most prevalent species is winged elm, Ulmus alata. An in-depth knowledge of allergen cross-reactivity is imperative when selecting allergens for immunotherapy. Photo taken on the Michigan State University Campus in East Lansing MI. Unfortunately, we do not have the resources to include the other native elms species such as winged elm in the research at this time. Because limiting the number of allergens in a vaccine preparation may be necessary to achieve the optimal therapeutic dose for each allergen, the cross-reactivity of clinically relevant allergens should be taken into account when making allergen selections. Elm and Hackberry trees in Missouri: American Elm (Ulmus americana) Winged Elm or Wahoo (Ulmus alata) Slippery Elm (Ulmus rubra) Siberian or Dwarf Elm (Ulmus pumila) Elm trees are native to North America and have a wide range, from all of the eastern states through the Central Plains. Elm Pollen Cycle. Scientific Name: Ulmus americana. Bees mix dry pollen with nectar and/or honey to compact the pollen in the pollen basket. Dry pollen, is a food source for bees, which contains 16–30% protein, 1–10% fat, 1–7% starch, many vitamins, but little sugar. Elm trees are also called white elm trees and American elm trees. From the beekeeping literature there seems to be little doubt that American elm (Ulmus americana) provides pollen for bees. John Lovell [9] indicates that the purplish flowers appear in the spring and are partly perfect … Photo Caption Ulmus americana in flower. 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