Cow parsnip is a very conspicuous native plant abundant in McDonald Woods. It is the largest native member of the carrot family in the Chicago area. The plant grows four feet tall or more with foot-long divided leaves along a stout stalk and is topped by a flat white flowerhead that can measure 8 inches across. The scientific name aptly describes it: "Heracleum" after Hercules and "maximum" for its size. It is called cow parsnip because the flower smells like like a barn full of cows. It should not be confused with the invasive and toxic giant hogweed, Heracleum mantegazzianum, which is even larger and found in more open areas. Cow parsnip is an ephemeral plant that withers during the summer, leaving behind the dried stalks and seeds.