Acer pubinerve Rehder

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Credits

John Grimshaw, Ross Bayton & Dan Crowley (2020)

Recommended citation
Grimshaw, J., Bayton, R. & Crowley, D. (2020), 'Acer pubinerve' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/acer/acer-pubinerve/). Accessed 2020-10-26.

Genus

  • Acer
  • Sect. Palmata, Ser. Sinensia

Synonyms

  • Acer wuyuanense W.P. Fang & Y.T. Wu
  • Acer campbellii subsp. chekiangense (W. P. Fang) A. E. Murray

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 pubinerve' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/acer/acer-pubinerve/). Accessed 2020-10-26.

Tree 5–10(–15) m. Bark dark grey, brown or purple. Branchlets pale green or purplish-green, slender, glabrous or pubescent. Leaves deciduous, broadly pentagonal in outline, base subcordate, 7–12 × 11–14 cm across, palmately 5-lobed, lobes one-third to half of the length, dark green and largely glabrous, margins slightly serrate, usually entire towards lobe bases, apically caudate; petiole 4–5 cm long, densely pubescent. Inflorescence paniculate to racemose, few-flowered. Flowers 5-merous, usually dioecious; sepals purplish-green, petals white, slightly shorter than sepals, stamens 8, inserted inside the glabrous nectar disc, ovary densely pubescent. Samaras ~3 cm long, yellowish, wings spreading horizontally. Flowering in April, fruiting in October (China). (van Gelderen et al. 1994Xu et al. 2008)

Distribution  China Anhui, northern Fujian, Guangdong, northen Guangxi, southern Guizhou, eastern Jiangxi, Zhejiang.

Habitat The Flora of China gives 'Forests at around 100 m asl', but see main text.

USDA Hardiness Zone 7-8

RHS Hardiness Rating H5

Conservation status Least concern (LC)

In North American collections as disparate as the David C. Lam Asian Garden in Vancouver and the US National Arboretum in Washington DC, Acer pubinerve (labelled A. wuyuanense) has won high praise as a beautiful small tree with great garden potential. In both these locations it is grown from seed collected by the 1988 NACPEC expedition to Huangshan, Anhui Province, China, near the Chi Guang Ge Temple at 640 m. As observed in May 2006, two specimens at the US National Arboretum had made rounded trees, approximately 2.5 m tall and equally wide. A notable feature was the abundance of pale green samaras nestling among the leaves. For Douglas Justice in Vancouver, however, it is the emerging foliage that draws attention. Memorably, he describes it as being like ‘oily, dark brown chicken feet’ (D. Justice, in Wharton et al. 2005), although his suggested English name Chocolate Maple is a more pleasing descriptor! This dark spring growth emerges from dark twigs, but becomes a rich green. In Vancouver, having been five plants in 2009, there are four as of Spring 2020, growing up to c. 7 m tall though somewhat reaching in partial shade (D. Justice, pers. comm. 2020). The largest, finest specimen is notable for being markedly later into leaf than the others, though all are grown from the same seed batch (D. Justice, pers. comm. 2020). The foliage of these plants shows clear resemblance to that of A. elegantulum and is unsuprising that Xu et al. (2008) state that they are tricky to distinguish and at some point might be combined.

While evidently an exceptionally interesting species, and of great value for smaller gardens, as of 2009 the species was unknown in Europe. The plants (then seedlings) at Westonbirt mentioned by Grimshaw & Bayton (2009) appear to be of hybrid origin. Though attractive in autumn colour, with shades of red and purple, they lack the spring gloss and colour and their leaves are not a match for those of true A. pubinerve. Some trees from the Huangshan were distributed from Castle Howard by James Russell in the late 1980s, but none grow there now (T. Kirkham, pers. comm. 2007), while one donated to Philippe de Spoelberch was dead by 1992 (K. Camelbeke, pers. comm. 2007). It is now present in Europe, though somewhat uncommon in European collections, having been available from Botanical Treasures Nursery, Antwerpen, through which private collectors acquired it (E. Davis, pers. comm. 2020). Young plants so named have also recently been added to the collections at RBG Kew and Windsor Great Park. It is also part of the collection at Rogow Arboretum, Poland (P. Banaszczak, pers. comm. 2020).

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