Shirasawa's Japanese maple
| Shirasawa's Japanese maple | ||||||||||||
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Shirasawa's Japanese maple ( Acer shirasawanum ) |
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| Acer shirasawanum | ||||||||||||
| Koidz. |
Shirasawa's Japanese maple ( Acer shirasawanum ) is a small tree in the maple genus in the soap tree family (Sapindaceae). The natural range is in Japan.
description
Shirasawa's Japanese maple is a tree up to 15 meters high with a broad crown and green, sometimes frosted, bare shoots. The leaves are nine to eleven lobed, 9 to 12 centimeters wide, with a rounded outline and a heart-shaped base. The lobes are elongated-ovate and pointed, the leaf margin is sharply double serrated. Both leaf sides are initially hairy, but bald except for axillary whiskers on the underside of the leaf. The petiole is thin, glabrous, and 3 to 8 inches long. The leaves turn yellow in autumn. The flowers are 6 to 8 millimeters wide and more than ten are in upright cymes . The individual flowers stand on a 4 to 6 centimeter long, bare stem, they have purple calyxes and whitish petals . The species blooms from May to June. The fruits are bare and stand in fruit clusters above the leaves. The wing is spread horizontally and slightly curved upwards.
Distribution and ecology
The distribution area is in Japan on the islands of Honshū and Shikoku . The species grows in cool, moist forests on moderately nutrient-rich, fresh to moist, well-drained, acidic to neutral, sandy-humic or gritty-humic soils in sunny to light-shady locations. The species is mostly frost hardy, but sensitive to lime.
Systematics and research history
Acer Shirasawanum ( Acer shirasawanum ) is a kind of the genus of maple ( Acer ) in the family of soap tree plants (Sapindaceae). There he is the section Palmata , serial Palmata assigned. It was first described in 1911 by Gen'ichi Koidzumi in the Journal of the College of Science, Imperial University of Tokyo .
use
The species is rarely used as an ornamental wood because of its unusual autumn colors . However, the following cultivars are planted more often :
- 'Aureum': with compact growth, densely branched crown and a height of 8 to 10 meters. The leaves are 7 to 8 centimeters wide, initially golden yellow, later darker and have reddish leaf veins and a reddish petiole.
- 'Palmatifidum': tree-like shrub up to 10 meters high. The leaves are divided into eleven long, lanceolate and pointed lobes up to the middle. The edges are clearly serrated and curved downwards.
proof
literature
- Andreas Roloff , Andreas Bärtels: Flora of the woods. Purpose, properties and use. With a winter key from Bernd Schulz. 3rd, corrected edition. Eugen Ulmer, Stuttgart (Hohenheim) 2008, ISBN 978-3-8001-5614-6 , p. 82.
Individual evidence
- ↑ German name according to Roloff et al .: Flora der Gehölze , p. 82
- ↑ a b c Roloff et al .: Flora of the Woods , p. 82
- ↑ a b Acer shirasawanum. In: Germplasm Resources Information Network (GRIN). United States Department of Agriculture, accessed December 29, 2011 .
