Acer truncatum

Acer truncatum
Foliage
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Sapindales
Family: Sapindaceae
Genus: Acer
Section: Acer sect. Platanoidea
Species:
A. truncatum
Binomial name
Acer truncatum

Acer truncatum, the Shantung maple,[2] Shandong maple, or purpleblow maple, is a maple native to northern China, in the provinces of Gansu, Hebei, Henan, Jiangsu, Jilin, Liaoning, Inner Mongolia, Shaanxi, Shandong, Shanxi, and to Korea.[3]

It is a medium-sized deciduous tree growing to 15 metres (49 ft) tall with a broad, rounded crown. The bark is smooth on young trees, becoming shallowly ridged with age. The leaves are opposite, palmately lobed with five lobes, 5 centimetres (2.0 in) to 12 centimetres (4.7 in) long and 7 centimetres (2.8 in) to 11 centimetres (4.3 in) broad, with a 3 centimetres (1.2 in) to 10 centimetres (3.9 in) petiole; the lobes are usually entire, but occasionally with a pair of teeth on the largest central lobe, and the margin is often wavy. The petiole bleeds a milky latex when broken. The flowers are in corymbs, yellow-green with five petals 5 millimetres (0.20 in) to 7 millimetres (0.28 in) long; flowering occurs in early spring. The fruit is a double samara with two winged seeds, the seeds are disc-shaped, slightly flattened, 13 millimetres (0.51 in) to 18 millimetres (0.71 in) across. The wings are 2 centimetres (0.79 in) long, widely spread, approaching a 180° angle. The bark is greenish-grey, smooth in young trees, becoming shallowly grooved in mature.[3][4][5] It is drought and heat resistant.[6]

It is closely related to, and often difficult to distinguish from, Acer amplum, Acer cappadocicum, and Acer pictum subsp. mono, which replace it further south and west in China, and in Japan. From Acer cappadocicum it is best distinguished by the shoots which turn brown by their first winter, not remaining green for several years.[5] From Acer mono (syn. A. pictum auct. non Thunb.) it is best distinguished by the larger, thicker (less flattened) seeds. Acer truncatum is very unusual among maples in showing hypogeal germination.[7]

Cultivation and uses

Shantung maple is grown as an ornamental plant in Europe and North America.[4][5]

A number of cultivars have been selected, including 'Akikaze Nishiki' with variegated leaves, 'Fire Dragon' with very bright autumn colour.[4] The cultivar 'Keithsform' (Norwegian Sunset) is a hybrid between Acer truncatum and Acer platanoides (Norway Maple).[8]

References

  1. ^ Chen, Y.; Gibbs, D.; Oldfield, S. (2018). "Acer truncatum". IUCN Red List of Threatened Species. 2018: e.T193886A2288883. doi:10.2305/IUCN.UK.2018-1.RLTS.T193886A2288883.en. Retrieved 30 October 2022.
  2. ^ BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
  3. ^ a b Tingzhi Xu; Yousheng Chen; Piet C. de Jong; Herman John Oterdoom; Chin-Sung Chang. "Acer truncatum". Flora of China. Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA. Retrieved 14 May 2015.
  4. ^ a b c Huxley, A., ed. (1992). New RHS Dictionary of Gardening. Macmillan ISBN 0-333-47494-5.
  5. ^ a b c Rushforth, K. (1999). Trees of Britain and Europe. Collins ISBN 0-00-220013-9.
  6. ^ "Acer truncatum | Landscape Plants | Oregon State University". landscapeplants.oregonstate.edu. Retrieved 2024-03-29.
  7. ^ Flora of China (draft): Acer truncatum[permanent dead link‍]
  8. ^ Oregon State University: Norwegian Sunset Archived 2011-05-15 at the Wayback Machine
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