Acer glabrum var. douglasii

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Acer glabrum var. douglasii (Hook.) Wesm.

Aceraceae

Life form: tree

Exposure: shade   5

Moisture: moist bis Moisture: wet

Soil: sandy loam - Soil: gritty loam

Arrangement: opposite
Leaves: decidious

Shape: not specified

Division: simple

              

Shape: five-stellate
Fruit: schizocarp

134B / 229143 

Inflorescence: corymb

Petals: not specified
Habit: not specified

Growth form: not specified

Taxonomy

Divisio:
Magnoliophyta
Subdivisio:
Magnoliophytina
Classis:
Rosopsida
Subclassis:
Rosidae
Superordo:
Rutanae
Ordo:
Sapindales

Acer glabrum var. douglasii, commonly known as Douglas maple, is a tree.

Naming

Acer glabrum var. douglasii was already described and the name validly published by William Jackson Hooker. It was Leopold Dippel, however, who reclassified it into todays valid botanical systematics in 1892.

Taxonomy

Acer glabrum var. douglasii is a variety 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.

Characteristics

Acer glabrum var. douglasii - leaves
Acer glabrum var. douglasii - seeds

Growth

The trees reach heights of 6 to 9 metres, they have a erect habit and produce a single stem. The main growing season is in spring and summer.

Wood and Bark

The bark is smooth and grey.

Leaves

Acer glabrum var. douglasii is deciduous. The dark-green, simple leaves are opposite. They are biserrate, petiolate and have palmate venation. The surface of the leaves is glabrous. The foliage is porous and turns an attractive yellow, orange to red in autumn.

Flowers and Fruits

Acer glabrum var. douglasii produces corymbs of green five-stellate flowers from May to June. The plants are dioecious.

The trees produce brown schizocarps from summer to autumn.

Root System

Distribution

Acer glabrum var. douglasii is native to Alaska, western Canada, the Northwest of the US and the Rocky Mountains.

Cultivation

The trees prefer a shady situation on moist to wet 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 -29°C (USDA zone 5) and need a frost-free period of at least 17 weeks.

Classification after Prof. Dr. Sieber:

  • woodland borders (soil usually rich in humus)

Tolerance of special soil conditions

  • none: soil salinity, anaerobic soil
  • low: drought, calcareous soil

Uses

The ornamental value of Acer glabrum var. douglasii lies especially in the attractive autumn aspect.

Maintenance and Propagation

Propagate by sowing. The seeds require vernalization.

Cultivars

Pests and Diseases

Literature

  • Walter Erhardt, Erich Götz, Nils Bödeker, Siegmund Seybold: Der große 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.

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