|Acer circinnatum subsp. var.||Vine maple|
It most commonly grows as a large shrub growing to around 5-8 m tall, but it will occasionally form a small to medium-sized tree, exceptionally to 18 m tall. The shoots are slender and hairless. It typically grows in the understory below much taller forest trees, but can sometimes be found in open ground, and occurs at altitudes from sea level up to 1,500 m.
The leaves are opposite, and palmately lobed with 7-11 lobes, almost circular in outline, 3-14 cm long and broad, and thinly hairy on the underside; the lobes are pointed and with coarsely toothed margins. The leaves turn bright yellow to orange-red in fall. The flowers are small, 6–9 mm diameter, with a dark red calyx and five short greenish-yellow petals; they are produced in open corymbs of 4-20 together in spring. The fruit is a two-seeded samara, each seed 8-10 mm diameter, with a spreading wing 2–4 cm long.
Vine Maple trees can bend over easily. Sometimes, this can cause the top of the tree to grow into the ground and send out a new root system, creating a natural arch.
It is occasionally cultivated outside its native range as an ornamental tree, from Juneau, Alaska and Ottawa, Ontario to Huntsville, Alabama, and also in northwestern Europe. It is closely related to Acer japonicum (Fullmoon Maple) and Acer pseudosieboldianum (Korean Maple) from eastern Asia, and can be difficult to distinguish from these species in cultivation.
Pests and diseases
- ↑ 1.0 1.1 1.2 Plants of British Columbia: Acer circinatum
- ↑ 2.0 2.1 2.2 Jepson Flora: Acer circinatum
- ↑ Ashley, A. & Ashley, P. (1990). The Canadian Plant Sourcebook. Cheriton Graphics, Ottawa, Canada.
- ↑ Downtown Juneau Tree Guide
- ↑ Buckley, A. R. (1980). Trees and Shrubs of the Dominion Arboretum. Research Branch, Agriculture Canada, Ottawa.
- ↑ University of Alabama, Huntsville: Oregon Vine Maple at UAH Arboretum
- ↑ Rushforth, K. (1999). Trees of Britain and Europe. Collins ISBN 0-00-220013-9.