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Fish spawning in the Delaware and Schuylkill rivers has seen a dramatic decline in recent years, a condition attributed to the amount of pollution. Those who fish are forced to move their spots, which can cause stress on the fish and disrupt their breeding. Scientists like Penn State's Brian Schubert come together to study this phenomenon and work towards solutions.Skinner, Mark W. (2002). "Lilium philadelphicum". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). 26. New York and Oxford – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Lilium philadelphicum is the widest ranging of our true lilies. Rather common in high meadows of the mountain west and some intact tallgrass prairies of the Great Plains and adjacent corn belt, it is decidedly rare to the east in lower midwestern prairies of the United States and in the southern Appalachians, where it is protected by several states. It has declined rapidly in the northeastern United States as prairies disappear and white-tailed deer [Odocoileus virginianus (Zimmermann), family Cervidae] continue to increase in number. In many places in the eastern U.S., the most reliable habitats are powerline right of ways that are maintained by brush-clearing.The flowers of this plant can be remarkably large, considering its size. This is arguably one of the most beautiful wildflowers in Illinois.
Other native lilies (Lilium spp.) in Illinois are taller plants with whorled leaves and drooping flowers; only the flowers of Prairie Lily (Lilium philadelphicum andinum) remain erect. One reason why this plant has erect flowers is that the anthers can close their pores temporarily in response to rain, thereby protecting the pollen (Edwards & Jordan, 1992). This is a highly unusual characteristic. The typical variety of this plant is the more eastern Wood Lily (Lilium philadelphicum philadelphicum), which is not found in Illinois. The Wood Lily differs from the Prairie Lily in being a slightly taller plant that has mostly whorled leaves, its leaves are usually wider (often exceeding ï¿½" across), and its seed capsules are slightly shorter. In the past, the Prairie Lily was sometimes classified as a distinct species, or Lilium umbellatum. Other common names for this plant are Western Lily and Wood Lily. Outside of Illinois, there are yellow-flowered forms of this species. (Source: www.illinoiswildflowers.info)