Vascular Plants of North Carolina
Account for Bluff Oak - Quercus austrina   Small
Members of Fagaceae:
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Section 6 » Order Fagales » Family Fagaceae
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DistributionWidely scattered over the central and southern Coastal Plain, and the southern Piedmont, north to Johnston County.

Scarce across its small range, occurring north to central NC, northern AL, and southern AR, and south into central FL. Known to occur in only seven states -– AR, MS, AL, GA, FL, SC, and NC.
AbundanceDespite records for nearly 9 counties (if correctly identified), it is very rare in NC, and quite restricted in habitat. Where found, only a very few individuals are generally seen. In addition, due to its similar appearance to White Oak (Quercus alba), it can be easily overlooked. It is State Significantly Rare.
HabitatThis species is essentially found only on high pH soils, mainly on bluffs and slopes, and along riverbanks/levees. There are a few reports from bottomlands and drier swamps, presumably where the soil is somewhat circumneutral.
PhenologyFlowers in April, and fruits (acorns) in October of the same season.
IdentificationThis is a very poorly known (in NC) deciduous tree, typically a tall tree up to 100 feet or taller. It is easily confused with White Oak. However, Bluff Oak normally has fewer and shorter lobes -– often only 5 lobes; and with the shortness of the lobes, the leaf is narrower than White Oak leaves. Normally one must looks at a number of leaves on a given tree to be sure you have this rare species; simply looking at one or two leaves is typically not enough to be certain. There are slight differences in the acorn from that of White Oak; see references for this distinction.
Taxonomic CommentsThere has been some confusion of this species with the Bastard Oak (Q. sinuata), which is synonymous with Q. durandii. Q. sinuata occurs north only to northern SC, and thus could occur in adjacent NC. Q. austrina has also been known as “Bastard Oak”, or “Bastard White Oak”, as has been Q. sinuata/durandii, thus adding to the confusion.

Other Common Name(s)Bastard Oak, Bastard White Oak
State RankS1
Global RankG4?
State StatusSR-P
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