It is related to the African tulip tree. There also are occasional examples of catalpa, chestnut, London plane, and tulip tree. In cultivation it grows as fast as the American tulip tree. The Chinese tulip tree reaches about tall. For example, aporphine alkaloid liriodenine produced by the tulip tree protects it from parasitic mushrooms. Also present are tulip tree and sassafras. Species grown south of their native areas include American sweetgum, Shumard oak, and tulip tree. Trees used for this purpose include oak, maple, the eastern cottonwood, and American tulip tree. In 2006, Larson launched her own publishing imprint, Tulip Tree Press. These nature preserves are Tulip Tree Woods and Freshwater Marsh. On a tulip tree, ants have been observed building a papery tent over the scales. Rare exotics which benefit from St-Lambert's favorable microclimate include Japanese maple and tulip tree. Also of interest is a tulip tree, "Liriodendron tulipifera". Typical trees are American beech, tulip tree, various oaks and hickories, and several other hardwoods. Examples are the tulip tree (a yellow poplar) and the American beech.