Acer macrophyllum Pursh
Acer macrophyllum is a tree.
Acer macrophyllum was described by Frederick Traugott Pursh in 1813. The name is considered as validly published.
Acer macrophyllum is a species in the genus Acer which contains approximately 230 to 296 species and belongs to the family of the Aceraceae (Maple Family). The type species of the genus is Acer pseudoplatanus.
The trees reach heights of 18 to 20 metres, the main growing season is in spring and summer. They have a rounded to broadly spreading canopy and are comparatively fast-growing.
Wood and Bark
The bark is grey.
Acer macrophyllum is deciduous. The green, simple leaves are opposite. They are palmately lobed and petiolate with lobate margins and palmate venation. The surface of the leaves is glabrous. The foliage is dense in summer and porous in winter and turns an attractive orange in autumn.
Flowers and Fruits
Acer macrophyllum produces racemes of pendant, yellow five-stellate flowers from April to May. The plants are dioecious, pollination takes places by allogamy through the wind and through animals.
From summer to autumn the trees produce an abundance of ornamental, edible brown schizocarps that are persistent on the plant.
Acer macrophyllum is native to Southeast Alaska, British Columbia, Washington and Oregon.
The trees prefer a half-shady situation on moderately moist soil. They prefer sandy-loamy or gritty-loamy soil with a pH between 4,8 and 7,2. The plants need a soil depth of at least 61 centimetres for good growth. They tolerate temperatures down to -18Â°C (USDA zone 7) and need a frost-free period of at least 20 weeks.
Tolerance of special soil conditions
- none: soil salinity
- low: drought, calcareous soil
- medium: anaerobic soil
The ornamental value of Acer macrophyllum lies especially in the attractive autumn aspect and its fragrance. From a commercial point of view the trees can be used to produce veneer. The plants have moderate potential for fuelwood production.
Maintenance and Propagation
- Plants can be cut back down to the trunk (coppicing) as necessary.
Propagate by sowing. The seeds require vernalization. Also by cuttings.
Pests and Diseases
- Walter Erhardt, Erich GÃ¶tz, Nils BÃ¶deker, Siegmund Seybold: Der groÃe Zander. Eugen Ulmer KG, Stuttgart 2008, ISBN 978-3-8001-5406-7. (Ger.)
- Christoper Brickell (Editor-in-chief): RHS A-Z Encyclopedia of Garden Plants. Third edition. Dorling Kindersley, London 2003, ISBN 0-7513-3738-2.