One of the featured trees at Eastwoodhill, this St. Landry's oak was described by Bob Berry in his ongoing catalogue as the most vigorous of the great many oaks at the arboretum [1]. It is likely that the tree is one of the largest of the species worldwide [2].

The naturally occurring semi-evergreen hybrid of Q. phellos (willow oak) and Q. pagoda (cherrybark oak) was found in 1913 in the parish of St. Landry, Louisiana by C.S. Sargent.

The tree at Eastwoodhill was supplied by Hilliers Nursery in the UK in 1949 and was planted at its current location in 1951.

The information sign by the tree gives it as a hybrid of Q. phellos and Q. falcata - that hybrid, Q. x subfalcata is hard to distinguish from Q. x ludoviciana. The Eastwoodhill tree shows the narrower leaf base of the latter hybrid [2], and is correctly identified as the product of Q. phellos and Q. pagoda on the ID attached to the tree.

Smillie, 2022

References:
1. International Oak Society, The Oaks at Eastwoodhill, https://www.internationaloaksociety.org/content/oaks-eastwoodhill, accessed 2022
2. International Oak Society, Hybrid Highlight: Quercus ×ludoviciana Sarg., https://www.internationaloaksociety.org/content/hybrid-highlight-quercus-×ludoviciana-sarg, accessed 2022.