Comprehensive DescriptionRead full entry
General: Composite family (Asteraceae). Cup plant (Silphium perfoliatum) is a tall perennial native that grows up to eight feet tall. This species has square stems and leaves that are mostly opposite, egg-shaped, toothed, with cuplike bases that hold water (Kindscher 1987). The flower heads are rich, golden yellow, 2.5 centimeters in diameter, and closely grouped at the tips of the stems (Hunter 1984). The small, tubular disk flowers are in the middle of the flower and is sterile and does not produce fruits (Ladd, 1995).
Distribution: Cup plant ranges from Ontario to South Dakota, south to Georgia, Mississippi, Missouri, and Oklahoma (Steyermark 1963). For current distribution, please consult the Plant profile page for this species on the PLANTS Web site.