Silphium perfoliatum, the cup plant[2] or cup-plant, is a species of flowering plant in the family Asteraceae, native to eastern and central North America. It is an erect herbaceous perennial with triangular toothed leaves, and daisy-like yellow composite flower heads in summer.[3]
The specific epithet perfoliatum means "through the leaf."[4]
There are two varieties:
Silphium perfoliatum var. connatum
Silphium perfoliatum var. perfoliatum.[5]
^"NatureServe Explorer 2.0". explorer.natureserve.org.
^USDA, NRCS (n.d.). "Silphium perfoliatum". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 15 November 2015.
^RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. p. 1136. ISBN 978-1-4053-3296-5.
^"Plants of the Eloise Butler Wildflower Garden". Friends of the Wild Flowers. 2008. Retrieved 15 May 2011.
^"ITIS Standard Report Page: Silphium perfoliatum var. connatum". Itis.gov. 2010-05-13. Retrieved 2012-09-06.
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