Overcup Oak Quercus lyrata Walter    Synonyms: Over-cup Oak, Swamp Post Oak.
Kingdom Plantae   >   Division Tracheophyta   >   Class Magnoliopsida   >   Order Fagales   >   Family Fagaceae   >   Genus Quercus   


Overcup Oak, a member of the White Oak group, is "restricted to poorly-drained lowlands of the Southern coastal plain and major rivers of the South and mid West" (Stein, et al., 2003). It is uncommon in Maryland, with records mainly from the coastal plain. In the late 20th century, a single Overcup Oak was known at Bear Island, near Great Falls along the Potomac River in the Piedmont of Montgomery County (J. and B. Hill, pers. obser.), but that tree has since died.


Overcup Oak is unusual for the way the cup of the acorn encloses the nut itself. This is the basis for its common name. The species epithet "lyrata" refers to the lyre-shaped leaves.

There are 13 records in the project database.

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Overcup Oak in Anne Arundel Co., Maryland (4/6/2011). Photo by Bill Harms. (MBP list)

Leaves of Overcup Oak in Biedler Forest, South Carolina (4/25/2012). Photo by Will Stuart. (MBP list)

Overcup Oak in Caroline Co., Maryland (6/21/2020). (c) Wayne Longbottom, some rights reserved (CC BY-NC). Photo by Wayne Longbottom. (MBP list)

The trunk of an Overcup Oak in Wood Co., Texas (11/28/2012). Photo by Sonnia Hill. (MBP list)

Overcup Oak in Caroline Co., Maryland (5/14/2018). Photo by Wayne Longbottom. (MBP list)

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