Description
Zelkova serrata is a medium sized deciduous tree usually growing to 30 meters (100 ft) tall. This tree is characterized by a short trunk dividing into many upright and erect spreading stems forming a broad, round topped head. The tree grows rapidly when young though the growth rate slows to medium upon middle age and maturity.
In summer, this tree has alternately arranged deciduous leaves. The leaves themselves are simple and ovate to oblong-ovate with serrated or crenate margins, to which the tree owes its species name “Serrata”. The leaves are acuminate or apiculate, rounded or subcordate at the base and contain about 8-14 pairs of veins. The leaves are rough on top and glabrous or nearly glabrous on the underside. They are green to dark green in spring and throughout the summer, though they change color in the autumn to a various assortment of yellows, oranges and reds. Leaves are 3–5 cm (1–2 in) long and 2–5 cm (0.8-2 inches) wide, on shoots that are approximately 12–13 cm (5 in) long. Petioles are 2–5 mm long.
Zelkova serrata develops monoecious flowers in spring with the leaves. Buds are ovoid, acutish, with many imbricate, dark brown scales. They diverge at a 45 degree angle from the stem. The staminate flowers are shortly pedicellate and approximately 3mm in diameter, clustered in the axils of the lowers leaves. The pistillate flowers are solitary or few in axils of the upper leaves, sessile and usually about 1.5 mm in diameter. The flowers are yellow-green, not showy, and occur in tight groups along new stems. They give rise to small, ovate, wingless drupes that ripen in late summer to autumn. The drupe is green though matures to a brown color, subsessile and 2.5 to 3.5 mm in diameter.
To identify Zelkova serrata, one would look for a short main trunk, low branching and a vase shaped habit. Its twigs are slender with small, dark conical buds in a zigzag pattern. The branches are usually glabrous. The bark is grayish white to grayish brown and either smooth with lenticels or exfoliating in patches to reveal orange inner bark. Branchlets are brownish purple to brown.
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