Acer × conspicuum van Gelderen & Oterdoom

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Credits

John Grimshaw, Ross Bayton & Dan Crowley (2020)

Recommended citation
Grimshaw, J., Bayton. R & Crowley, D. (2020), 'Acer × conspicuum' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/acer/acer-x-conspicuum/). Accessed 2020-08-13.

Genus

Infraspecifics

Other species in genus

Glossary

hybrid
Plant originating from the cross-fertilisation of genetically distinct individuals (e.g. two species or two subspecies).

References

There are currently no active references in this article.

Credits

John Grimshaw, Ross Bayton & Dan Crowley (2020)

Recommended citation
Grimshaw, J., Bayton. R & Crowley, D. (2020), 'Acer × conspicuum' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/acer/acer-x-conspicuum/). Accessed 2020-08-13.

This taxon is the result of a cross between A. davidii and A. pensylvanicum, although the name seems to be being applied somewhat casually to other crosses as well. Tree to 10 m, sparsely branched. Bark blue-green or reddish with conspicuous white stripes. Leaves deciduous, 5–20 × 5–15 cm, palmately 3-or 5-lobed, the lobes long-acuminate, glabrous or sparsely pubescent below, margins serrate; petiole 2–10 cm long, reddish; autumn colour golden- or orange-yellow. Inflorescence terminal, pendulous racemes, 4–15 cm long. Flowers small. Samaras similar to those of A. davidii, usually short. (van Gelderen et al. 1994van Gelderen & van Gelderen 1999). Distributed in cultivation only. 

Distribution 

USDA Hardiness Zone 5-7

RHS Hardiness Rating H5

This artificial hybrid is of great importance to horticulture and selections of it and related hybrids are extremely popular garden trees, although it should be noted that many can reach at least 10 m in height, with a rounded crown, so they are not subjects for restricted spaces. Acer × conspicuum has occurred on several occasions where the parents grow together, and can be expected to reappear in seedlings of cultivated origin. Several selections ostensibly grown as A. × conspicuum are not attributable to this hybrid and are treated here as unattributed cultivars, namely ‘Candy Stripe’, ‘Siver Cardinal’ and ‘Red Flamingo’. The true parentage of many requires further study. Those convincingly selected from A. × conspicuum are treated below.


'Elephants Ear'

RHS Hardiness Rating: H5

Grown from open pollinated seed, which was collected from an Acer davidii at Plantentuin Esveld, and raised and introduced by R. Bulk Nurseries in 1990 (van Gelderen & van Gelderen 1999). It has striking purplish bark and very large, unlobed or shallowly lobed dark green leaves to 30 cm long (Edwards & Marshall 2019), with unspectacular autumn colour.


'Phoenix'

RHS Hardiness Rating: H5

An offspring of ‘Silver Vein’, ‘Phoenix’ has striking coral-pink winter stems that are highly effective in the winter landscape. It is considered one of the best for this character by van Gelderen & van Gelderen (1999). Raised by Plantentuin Esveld and introduced by this nursery in 1986 (van Gelderen & van Gelderen 1999).


'Silver Vein'

RHS Hardiness Rating: H5

The first selection made from the hybrid, the result of a deliberate cross made by Peter Douwsma at the Hillier’s Chandlers Ford nursery in 1961 and introduced by the Hillier Nurseries in 1975. A cross between Acer davidii ‘George Forrest’ and A. pensylvanicum ‘Erythrocladum’, it makes a small tree with blue-green and strongly striated stems, the leaves are large, three-lobed in the upper half, rich green in colour with long red petioles, turning yellow in autumn (Edwards & Marshall 2019). It is acclaimed as one of the best snakebark maples, retaining the excellent bark coloration for many years (van Gelderen & van Gelderen 1999).

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