Acer pectinatum

Acer pectinatum
	Acer pectinatum subsp. forrestii
Systematics
	Eurosiden II
Order :	Sapindales (Sapindales)
Family :	Soap tree family (Sapindaceae)
Subfamily :	Horse chestnut family (Hippocastanoideae)
Genre :	Maples ( Acer )
Type :	Acer pectinatum
Scientific name
	Acer pectinatum
	Wall. ex G.Nicholson

Acer pectinatum is a plant from the genus of maple ( Acer ) in the family of soap tree plants (Sapindaceae). It occurs in East and South Asia .

description

Illustration of Acer pectinatum subsp. laxiflorum

Vegetative characteristics

Acer pectinatum grows as a deciduous tree that can reach heights of up to 20 meters. The smooth bark is dark brown and the hairless bark of the twigs is purple to purple-green. The winter buds are purple.

The constantly against arranged on the branches leaves consist of petiole and leaf blade. The 2 to 7 centimeters long, purple-red leaf stalk has reddish-brown hairs on young trees that disappear with age. The paper-like, three- to five-lobed, wide leaf blade is 7 to 10 inches long and 6 to 8 inches wide. The middle lobe is egg-shaped while the adjoining lobes are triangular. All lobes have a tail or pointed tip. The leaf margin is serrated. The top of the leaf is dark green, the underside of the leaf light green. On the underside of the leaf there is mainly a reddish-brown hairiness on the veins , while the upper side of the leaf is hairless.

Generative characteristics

The flowering time is in April only after the leaf shoots. In Acer pectinatum , as in most species of the Macrantha section , andromonözie is present. The racemose inflorescence is 6 to 8 inches long and usually contains 10 to 40 flowers. The slender flower stalks are 5 to 7 millimeters long.

The flowers are radial symmetry and five-fold with a double flower envelope . In the male flowers, the five sepals , which are about 5 millimeters long, are purple-greenish, the five petals are obovate and there are eight hairless stamens about 2 millimeters in size , and only a rudimentary ovary is formed.

A yellowish wing fruit about 1.6 to 2.5 centimeters long and 6 to 8 millimeters thick is formed. The wing protruding almost horizontally at an obtuse angle is sickle-shaped. The flat seed is around 7 millimeters long and 4 millimeters wide. The fruits ripen in September.

Chromosome number

The number of chromosomes is 2n = 26.

Locations

In China, Acer pectinatum thrives mainly in mixed forests at altitudes of 2300 to 3700 meters.

Systematics and distribution

The type Acer pectinatum belongs to section Macrantha from the kind of maples ( Acer ) within the family of the soap tree plants (Sapindaceae). The first description of Acer pectinatum was in 1881 by Nathaniel Wallich in George Nicholson : The Gardeners' Chronicle .

The natural range of Acer pectinatum includes Sikkim , Bhutan , Nepal , northeast Myanmar , eastern and southern Tibet and the Chinese provinces: southern Gansu , northeastern Guangxi , Guizhou , western Henan , western Hubei , Hunan , southern Qinghai , southern Shaanxi , southern Shanxi , western Sichuan and northwestern Yunnan .

Hard leaves of the cultivar Acer pectinatum subsp. forrestii 'Sparkling'

Subspecies

There are five subspecies of the species Acer pectinatum :

Acer pectinatum subsp. forrestii (Diels) AEMurray ( Syn .: Acer forrestii Diels ): It is named after George Forrest (1873-1932). It occurs in southwestern Sichuan and northwestern Yunnan .
Acer pectinatum subsp. laxiflorum (Pax) AEMurray (Syno .: Acer laxiflorum Pax ): It occurs only in western Sichuan.
Acer pectinatum subsp. maximowiczii (Pax) AEMurray (Syn .: is Acer maximowiczii Pax ): It occurs in the majority of the Chinese distribution area.
Acer pectinatum Wall. ex G.Nicholson subsp. pectinatum is the nominate form . It is common in India , Bhutan , Nepal , Myanmar and in southern Tibet and northwestern Yunnan.
Acer pectinatum subsp. taronense (Hand.-Mazz.) AEMurray (Syn .: Acer taronense Hand.-Mazz. ): It occurs in northeastern India , in Bhutan , Myanmar , in eastern Tibet , in western Sichuan and northwestern Yunnan.

swell

Tingzhi Xu, Yousheng Chen, Piet C. de Jong, Herman John Oterdoom, Chin-Sung Chang: Aceraceae. In: Wu Zheng-yi, Peter H. Raven, Deyuan Hong (Eds.): Flora of China . Volume 11: Oxalidaceae through Aceraceae . Science Press / Missouri Botanical Garden Press, Beijing / St. Louis 2008, ISBN 978-1-930723-73-3 , pp. 541 (English). , online (sections description and systematics).

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h Tingzhi Xu, Yousheng Chen, Piet C. de Jong, Herman John Oterdoom, Chin-Sung Chang: Aceraceae. In: Wu Zheng-yi, Peter H. Raven, Deyuan Hong (Eds.): Flora of China . Volume 11: Oxalidaceae through Aceraceae . Science Press / Missouri Botanical Garden Press, Beijing / St. Louis 2008, ISBN 978-1-930723-73-3 , pp. 541 (English). , online .
^ Acer pectinatum at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
^ ^A ^b Acer pectinatum in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved January 12, 2011.

Web links

Commons : Acer pectinatum - collection of images, videos and audio files

[FoC-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h Tingzhi Xu, Yousheng Chen, Piet C. de Jong, Herman John Oterdoom, Chin-Sung Chang: Aceraceae. In: Wu Zheng-yi, Peter H. Raven, Deyuan Hong (Eds.): Flora of China . Volume 11: Oxalidaceae through Aceraceae . Science Press / Missouri Botanical Garden Press, Beijing / St. Louis 2008, ISBN 978-1-930723-73-3 , pp. 541 (English). , online .

[IPCN-2] Acer pectinatum at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis

[GRIN-3] A ^b Acer pectinatum in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved January 12, 2011.