JUGLANS CORDIFORMIS, Cordate Walnut
- Juglans cordiformis, Maximowicz, Mél. Biol. viii. 635, cum fig. (1872); Shirasawa, Icon. Ess. Forest Jap., text 35, t. 17 (1899); Rehder, Mittheil. Deut. Dendrol. Gesell. 1903, p. 117; Gardeners' Chronicle, 1901, xxx. 292, Supplementary Illustration.
- Juglans Sieboldiana, var. cordiformis, Makino, in Tokyo Bot. Mag. 1895, p. 313.
A tree attaining 50 feet in height and 6 feet in girth. Bark, according to Shirasawa, remaining smooth for a long time, becoming fissured with age.
Leaves with eleven to thirteen leaflets, which are sub-opposite, oblong with unequal sides, acute or acuminate at the apex, cordate at the base, sessile or subsessile, the petiolule not exceeding 1⁄16 inch, the base of the leaflet extending over the rachis so that the leaflet appears to be more sessile than is the case in J. Sieboldiana; serrations fine, shallow, irregular, directed forwards and ciliate; upper surface finely pubescent, with only tufted hairs; lower surface pale in colour, pubescent, with numerous stellate hairs, dense along the midrib on which the hairs are glandular; rachis with densely glandular long reddish hairs, sessile glands being absent. Young shoots covered with long white hairs, which are tipped with red glands and are much denser than in J. Sieboldiana; no sessile glands visible. Leaf-scar as in that species.
Flowers: male catkins twelve inches long or more; female catkins about five inches long, bearing seven to twelve flowers.
Fruit globose; nut heart-shaped, much flattened, sharply two-edged, with a shallow longitudinal groove in the middle of each flattened side, smooth over the surface, rather thin-shelled.
Identification
Readily distinguished in summer by the cordate leaflets and the young shoots densely covered with long white hairs, which bear red glands at the tips. See under Juglans Sieboldiana.
In winter the following characters are available:—Twigs stout, brown, covered with long glandular hairs, which tend, however, to fall off from the lower part of the shoot. Leaf-scar large, set slightly obliquely on pulvini which are scarcely elevated, obovate with two lateral lobes and notched above; the upper margin with a transverse raised band of pubescence; bundle-dots in three groups. Terminal bud conical, but compressed laterally, brown, densely pubescent, the two outer scales lobed at the apex. Lateral buds often two superposed, small, brown, ovoid, arising from the twigs at an angle of 60°, densely pubescent. Pith large, brown, with wide chambers.
Distribution
According to Maximowicz, this species occurs in Nippon. Shirasawa says that it is spread along the banks of rivers in the temperate regions of Japan, being rare in
