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Acer sieboldianum
From Wikipedia, the free encyclopedia
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 Von Gimborn Arboretum, Doorn, Netherlands, with Acer sieboldianum in autumn colour
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| Acer sieboldianum Friedrich Anton Wilhelm Miquel, 1865 |
Acer sieboldianum, or Siebold's Maple, is a variety of maple native to Japan and common in the mountain forests of Honshū, Shikoku and Kyushu Islands. It is named in honor of Philipp Franz von Siebold.[1]
A. sieboldianum is a slender, upright shrub (or rarely, tree) that grows to about 9 m (30 feet tall) and 4 m (12 feet) wide. Its leaves are dark green, 5-8 cm wide, and moderately incised so as to create approximately seven to nine lobes. Veins on the underside of leaves are slightly tomentose, a feature useful in distinguishing it from the very similar A. palmatum.[1]
Siebold's Maple is not as rare in cultivation as it seems. Specimens are often mistaken for and mislabeled as similar species within series Palmata such as A. japonicum, A. shirasawanum and A. palmatum, Also confusing the matter is the existence of A. pseudosieboldianum, i.e., "False Siebold's Maple" (better known as "Korean Maple" or "Keijo Maple").[1]
Most cultivars recognized as those of A. sieboldianum are rarely seen outside of Japan. Cultivars include 'Kinugasa yama', 'Mi yama nishiki', 'Ogura yama', 'Sode no uchi' and 'Osiris'.[1]