Acer shirasawanum
Shirasawas subjects maple ( Acer shirasawanum )
Shirasawas subjects maple ( Acer shirasawanum ) is a small tree of the genus of the maples in the family of Soapberry ( Sapindaceae ). The natural range is in Japan.
Description
Shirasawas subjects Maple is a 15 meters tall tree with a broad crown and green, sometimes tired, bare branches. The leaves are neunlappig to elflappig, 9 to 12 inches wide, with a rounded outline and heart- shaped base. The lobes are oblong - ovate and pointed, the leaf margin is sharply doubly serrate. Both leaf pages are initially hairy but verkahlen up to axillary beards on the underside of leaves. The petiole is thin, bald and 3 to 8 inches long. The leaves turn yellow in autumn. The flowers are 6-8 mm wide and are more than ten in upright cymes. The individual flowers are on a 4 to 6 centimeters long, leafless stalk, they have purple chalices and whitish petals. The species flowers from May to June. The fruits are bare and are in fruit stalls on the leaves. The wing is horizontal spread and slightly curved upwards.
Distribution and ecology
The distribution area is located in Japan on the islands of Honshu and Shikoku. The species grows in cool moist forests on moderately nutrient-rich, moist to moist, well drained, acidic to neutral, sandy- gravelly or humic - rich soils in full sun to light shade locations. The species is usually frost hardy but sensitive to lime.
Systematics and history of research
Shirasawas subjects maple ( Acer shirasawanum ) is a species of the genus maples ( Acer) in the family of Soapberry ( Sapindaceae ). There he is assigned to the section Palmata, serial Palmata. The first description was in 1911 by Gen'ichi Koidzumi the Journal of the College of Science, Imperial University of Tokyo.
Use
The species is rarely used because of their exceptional autumn color as ornamental tree. However, the following cultivars are more commonly planted:
- ' Aureum ': with compact habit, densely branched crown and a height of 8 to 10 meters. The leaves are 7-8 inches wide, golden yellow at first, later dark and have reddish veining and a reddish petiole.
- ' Palmatifidum ': tree-like, up to 10 meters tall shrub. The leaves are divided to the middle into eleven long, lanceolate and pointed lobes. The edges are clearly perforated and bent downward.