Acer circinatum Pursh
Acer circinatum is a tree.
Acer circinatum was described by Frederick Traugott Pursh in 1813. The name is considered as validly published.
Acer circinatum 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 5 to 6 metres, the main growing season is in spring and summer. They have a rounded to broadly spreading canopy and are comparatively long-lived. The plants reach a width of 5 to 7 metres.
Wood and Bark
The bark is smooth and green.
Acer circinatum is deciduous. The dark-green, simple leaves are opposite. They are palmately lobed and petiolate with serrate margins and palmate venation. The surface of the leaves is glabrous. The foliage is porous and turns an attractive bright orange to red in autumn.
Flowers and Fruits
Acer circinatum produces showy umbels of pendant, green five-stellate flowers from March to May. The plants are dioecious.
The trees produce brown schizocarps from summer to autumn.
The plants form tap roots.
Acer circinatum is native to Alaska, Washington, Oregon and North California.
The trees prefer a half-shady situation on moist soil. They prefer sandy-loamy or gritty-loamy soil with a pH between 5,5 and 7,5. The plants need a soil depth of at least 61 centimetres for good growth. They tolerate temperatures down to -29Â°C (USDA zone 5) and need a frost-free period of at least 29 weeks.
Classification after Prof. Dr. Sieber
- woodland borders (soil usually rich in humus)
Tolerance of special soil conditions
- none: soil salinity, anaerobic soil, calcareous soil
- low: drought
The ornamental value of Acer circinatum lies especially in the attractive autumn aspect. The recommended planting distance is 2 to 2,4 metres. From a commercial point of view the trees can be used to produce naval stores. The plants have high potential for fuelwood production.
Maintenance and Propagation
The plants usually require only a moderate amount of maintenance.
Propagate by sowing. The seeds require vernalization.
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.