Swamp Post Oak
The Quercus Lyrata
is commonly known as Overcup Oak
, Swamp Post Oak
, Swamp White Oak
, as well as Water White Oak< Go Back
Overcup oak occurs on the Coastal Plain from southern Virginia south to
Georgia and northwestern Florida; west to eastern Texas; north in the
Mississippi Valley to extreme southeastern Oklahoma, southern Illinois,
southwestern Indiana, and western Kentucky. Disjunct populations occur
in Delaware, Maryland, central Tennessee, and northern Alabama [27
The currently accepted scientific name of overcup oak is Quercus
lyrata Walt. [18
]. Two accepted forms are differentiated [7
Q. l. forma lyrata, with hairy undersurfaces,
Q. l. forma viridis Trel., with scattered hairs on leaf undersurfaces.
Overcup oak hybridizes with many other oaks in the white oak subgenus
(Quercus) including white oak (Q. alba), swamp white oak (Q. bicolor),
Durand oak (Q. durandii), bur oak (Q. macrocarpa), swamp chestnut oak
(Q. michauxii), post oak (Q. stellata), and live oak (Q. virginiana)
]. Overcup oak is genetically most similar to post oak, based on
electrophoretic evidence [14
Overcup oak is dominant in only one described cover type, overcup
oak/water hickory (Carya aquatica) . This cover type extended over
1,241,250 acres (496,500 ha) of the lower Mississippi Valley in 1990.
It was the most floristically diverse of the wet-site cover types, with
five species making up 60 percent of the basal area .
Tree associates not mentioned previously include laurel oak (Q.
laurifolia), American elm (Ulmus americana), cedar elm (U.
crassifolia), water locust (Gleditsia aquatica), common persimmon
(Diospyros virginiana), hawthorn (Crataegus spp.), planer-tree (Planera
aquatica), and red maple (Acer rubrum). Shrub associates include
swamp-privet (Forestiera acuminata), roughleaf dogwood (Cornus
drummondii), swamp dogwood (C. stricta), and common buttonbush
(Cephalanthus occidentalis) [12,39].
< Go Back
Much of the information presented here is attributed to:
Sullivan, Janet. Quercus lyrata. 1993. In: Fire Effects Information System, [Online].
U.S. Department of Agriculture, Forest Service,
Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available at USDA Forest Service.