Similar to the ragweeds, the small, greenish flowers often form clusters in the leaf axils. It is the curled stamens of the male flowers, which release the pollen responsible for allergic reactions. One species of Australian nettle tree, Laportea moroides, is cultivated for its raspberry-like flower clusters. Elm refers to any of about 18 species of forest and ornamental shade trees of the family Ulmaceae , which are native in northern temperate regions. Elm are often cultivated for their attractive foliage.
Most species are susceptible to the fungoid disease, Dutch elm disease.
The red mulberry is used to make mulberry wine. Silkworms are feed on mulberry leaves. A wall-climbing plant, common all around the Mediterranean and along the West coast of Europe as far north as central England. Surprisingly, no cross reactions are displayed to the closely-related Urticaceae family nor to other species of pellitory.