Within the Phellodendron amurense article...


var. lavallei (Dode) Sprague

Synonyms
P. lavallei Dode
P. amurense Hort., in part, not Rupr.
P. japonicum Hort., in part, not Maxim

Bark corky, though less so than in typical P. amurense. Leaflets oval-lanceolate, seven to eleven, with long slender points, obliquely rounded at the base, or sometimes abruptly narrowed to an acute wedge, dullish green above, midrib and chief veins beneath furnished with white hairs, margins ciliate. Panicles downy. Bot. Mag., t. 8945.Native of Japan; introduced to cultivation in 1865 or 1866 by means of seeds collected by Tschonoski and distributed from St Petersburg by Regel; reintroduced by Wilson in 1918. It was at first grown as P. amurense or P. japonicum, and was separated as a species in 1909 by Dode, who drew up his description from a tree grown by Lavallée in the Segrez Arboretum (see further in Dr Stapf’s note accompanying the plate in the Botanical Magazine). P. japonicum differs from this variety in the soft down which covers the whole of its much more rounded leaflets beneath; typical P. amurense has only a little down near the base of the midrib and the upper surface is dark, glossy green.P. amurense var. lavallei succeeds very well under cultivation and grows vigorously at Kew, where there is a specimen planted in 1899, measuring 40 × 3{1/2} ft (1967). This tree fruits and produces fertile seeds, although the nearest male phellodendron is at a considerable distance. This is also true of a tree at Borde Hill in Sussex, younger than the Kew tree, which measures 35 × 3{1/2} ft at 4 ft (1968); it fruits abundantly, although the nearest possible pollinator is a small tree more than 100 yards away. The leaves turn bright yellow before falling.

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