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Acer sieboldianum - Morris Arboretum - DSC00314

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids II
Ordo: Sapindales

Familia: Sapindaceae
Subfamilia: Hippocastanoideae
Tribus: Acereae
Genus: Acer
Species: Acer sieboldianum
Varietates: A. s. var. microphyllum – A. s. var. sieboldianum
Name

Acer sieboldianum Miq., Ann. Mus. Bot. Lugduno-Batavi 2: 87 (1865).
References
Additional references

Ohwi, J. 1965. Flora of Japan (translated by F.G. Meyer & E.M. Walker). 1067 pp. Smithsonian Institution, Washington, D.C. BHL Reference page.
Gelderen, D.M. van, Jong, P.C.de & Oterdoom, H.J. 1994. Maples of the world. Timber Press, Portland, Or., 458 pp. ISBN 0-88192-000-2. Reference page.
Govaerts, R.H.A. 1995. World Checklist of Seed Plants 1(1, 2). 483, 529 pp. MIM, Deurne. ISBN 90-341-0852-X (issue 1) ISBN 90-341-0853-8 (issue 2). Reference page.
Murray, A.E., 1970. A monograph of the Aceraceae. Unpublished Ph.D. dissertation, The Pennsylvania State University. Reference page.
Iwatsuki, K., Boufford, D.E. & Ohba, H. (eds.) 1999. Flora of Japan IIc. Angiospermae, Dicotyledoneae, Archichlamydeae(c). 328 pp., Kodansha Ltd., Tokyo. ISBN 978-4-06-154606-6 Reference page.

Links

USDA, ARS, Germplasm Resources Information Network. Acer sieboldianum in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 08-Apr-12.
Govaerts, R. et al. 2020. Acer sieboldianum in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2020 January 8. Reference page.
International Plant Names Index. 2020. Acer sieboldianum. Published online. Accessed: 8 January 2020.

Vernacular names
English: Siebold's Maple
polski: Klon Siebolda

Acer sieboldianum (Siebold's maple; Japanese: コハウチワカエデ, romanized: kohauchiwakaede) is a species of maple native to Japan and common in the forests of Hokkaidō, Honshū, Shikoku and Kyūshū Islands; in the south of the range it is restricted to mountain forests.[1] It is named after Philipp Franz von Siebold.
Description

It is a slow-growing, small to medium-sized deciduous tree growing to 10–15 metres (33–49 ft) tall, with smooth grey-brown bark. The young shoots are green to red, thinly covered with white hairs in their first year. The leaves are mid to dark green, 4–8 centimetres (1.6–3.1 in) long and 5–10 centimetres (2.0–3.9 in) broad with a 3–7 centimetres (1.2–2.8 in) petiole, and palmately lobed with nine to eleven (occasionally just seven) lobes. The young leaves in spring are downy with white hairs, with the petiole and veins on the underside of the leaf remaining hairy all summer, a feature useful in distinguishing it from the related Acer palmatum. In autumn, the leaves turn bright orange to red. The flowers are pale yellow, produced in corymbs of 10–15 together; it is andromonoecious, with inflorescences containing flowers with either both sexes, or just male. The fruit is a paired samara, the pair spreading horizontally, each seed with a 15–20 millimetres (0.59–0.79 in) wing. Flowering is in late spring, with fruit maturation in early autumn.[1][2][3][4]

The smooth bark and yellow flowers help distinguish it from the closely related Acer japonicum (Japanese, hauchiwakaede), which has rough, scaly bark, and red flowers, while the hairy stems and yellow flowers distinguish it from Acer shirasawanum (Japanese, ooitayameigetsu; with hairless stems and red flowers).[3][5]
Cultivation
Acer sieboldianum 'Osiris' in autumn colour, at the Von Gimborn Arboretum, the Netherlands

Siebold's maple is not as rare in cultivation as it seems. Specimens are often mistaken for and mislabeled as similar species in the series Palmata, such as Acer japonicum, Acer shirasawanum and Acer palmatum; it is also sometimes confused with Acer pseudosieboldianum (Korean Maple or Keijo Maple), a closely related species from the adjacent mainland of northeastern Asia.[4]

Several cultivars have been selected, most only rarely seen outside Japan. Cultivars include 'Kinugasa yama', 'Mi yama nishiki', 'Ogura yama', 'Sode no uchi' and 'Osiris'.[4][6]
References

Kobe city: Acer sieboldianum Archived 2007-11-27 at the Wayback Machine (in Japanese; google translation)
Okayama science university: Acer sieboldianum (in Japanese; google translation)
Kanagawa Prefecture trees and shrubs: Acer sieboldianum Archived 2010-10-29 at the Wayback Machine (in Japanese; google translation). Archived 2009-10-24.
van Gelderen, C.J. & van Gelderen, D.M. (1999). Maples for Gardens: A Color Encyclopedia.
Japanese mountain plants: kohauchiwakaede (in Japanese; google translation)
de Jong, P. (2007). Parels uit het Von Gimborn Arboretum (23) - Acer sieboldianum 'Osiris'. Hortus (Utrecht) 26 (2).

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