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Article from Bean's Trees and Shrubs Hardy in the British Isles
'Quercus × leana' from the website Trees and Shrubs Online (treesandshrubsonline.
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A natural hybrid between Q. imbricaria and Q. velutina, of which there are several fine trees in this country. The leaves in shape approach those of Q. imbricaria, being oblong and tapered at both ends; they are, however, rarely entire as in that species, but are more or less irregularly, and either deeply or shallowly lobed, 3 to 7 in. long, 1 to 21⁄2 in. wide; dark green and glossy above, furnished with a scurfy down beneath, but not so thickly as in Q. imbricaria. Young shoots more or less scurfy with starry down. This oak is named in honour of T. G. Lea, who discovered it about 1830, near Cincinnati, Ohio. According to Sargent, it is scattered widely as solitary individuals over the south-eastern United States. From the variable character of trees given this name, especially in shape and pubescence of leaf, it is probable that it represents trees of different origin, although Q. imbricaria is undoubtedly one parent. In 1910 I saw trees in the Arnold Arboretum with leaves 3 to 5 in. wide. It is always a vigorous, handsome oak.
The example at Kew in the Oak collection, pl. 1877, measures 64 × 6 ft (1964). Others on record are: Leonardslee, Sussex, 60 × 23⁄4 ft (1969); Highclere, Hants, 55 × 6 ft (1968); Westonbirt, Glos., 63 × 51⁄4 ft (1967).
Some other hybrids between a willow oak and a red oak may be mentioned here (see also Q. × ludoviciana):
specimens: Kew, Oak Collection, pl. 1877, 59 × 63⁄4 ft (1978); Hollycombe, Liphook, Hants, 70 × 71⁄2 ft (1984); Westonbirt, Glos., Oak Collection, 66 × 6 ft (1983) and, Willesley Drive, 70 × 33⁄4 ft (1979).
Q. rubra var. runcinata A.DC