Quercus lamellosa Sm.

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Credits

Allen Coombes & Roderick Cameron (2022)

Recommended citation
Coombes, A. & Cameron, R. (2022), 'Quercus lamellosa' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/quercus/quercus-lamellosa/). Accessed 2022-10-06.

Genus

  • Quercus
  • Subgen. Cerris, Sect. Cyclobalanopsis

Common Names

  • 薄片青冈 (bao pian qing gang)
  • फलाँट (falant)

Synonyms

  • Dyropsila aprica Raf.
  • Cyclobalanopsis fengii Hu & W.C. Chang
  • Cycobalanopsis lamelloides (C.C. Huang) Y.T. Chang
  • Cyclobalanopsis lamellosa (Sm.) Oerst.
  • Cyclobalanopsis lamellosa var. nigrinervis (Hu) Z.K. Zhou & H. Sun
  • Cyclobalanopsis nigrinervis Hu
  • Quercus imbricata Buch. Ham. ex D.Don.
  • Quercus lamellata Roxb.
  • Quercus lamelloides C.C. Huang
  • Quercus lamellosa var. nigrinervis (Hu) Z.K. Zhou & H. Sun
  • Quercus paucilamellosa A.DC.
  • Perytis lamellosa (Sm.) Raf.

Other taxa in genus

Glossary

Near Threatened
IUCN Red List conservation category: ‘does not qualify for Critically Endangered Endangered or Vulnerable now but is close to qualifying or is likely to qualify for a threatened category in the near future’.
Tibet
Traditional English name for the formerly independent state known to its people as Bod now the Tibet (Xizang) Autonomous Region of the People’s Republic of China. The name Xizang is used in lists of Chinese provinces.
Xizang
See Tibet.
cupule
Cup-shaped structure formed from coalescent bracts. Typical of Fagaceae and Nothofagaceae. May be dehiscent (as in e.g. Castanea) or indehiscent (as in e.g. Quercus).
dbh
Diameter (of trunk) at breast height. Breast height is defined as 4.5 feet (1.37 m) above the ground.
lamina
Leaf blade.
section
(sect.) Subdivision of a genus.
synonym
(syn.) (botanical) An alternative or former name for a taxon usually considered to be invalid (often given in brackets). Synonyms arise when a taxon has been described more than once (the prior name usually being the one accepted as correct) or if an article of the International Code of Botanical Nomenclature has been contravened requiring the publishing of a new name. Developments in taxonomic thought may be reflected in an increasing list of synonyms as generic or specific concepts change over time.

Credits

Allen Coombes & Roderick Cameron (2022)

Recommended citation
Coombes, A. & Cameron, R. (2022), 'Quercus lamellosa' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/quercus/quercus-lamellosa/). Accessed 2022-10-06.

Tree to 40 m tall and 3 m trunk diameter, evergreen, sometimes subevergreen, spreading habit. Bark greyish brown, rough in places. Young twigs covered in floccose, tawny tomentum, glabrescent, later dark grey, bearing elongated, pale lenticels. Buds short and almost round, with brown pubescent scales. Leaves leathery, oval, oval-lanceolate, oblong or almost elliptic, 15–45 cm long × 5–22 cm wide, base cuneate or almost rounded, apex acute or acuminate, upper surface glabrous, shiny green, lower surface whitish or glaucous and waxy except for the midvein; leaves emerge covered in pubescence, upper surface with pale brown, shortly stellate hairs; leaves sometimes fall before new leaves emerge; midvein and secondary veins straight, prominent below and impressed above, 10–35 pairs of secondary veins, extending to the margin, tertiary veins conspicuous below. Petiole glabrous, 2–4.5 cm long. Cupule rounded, depressed, lignified, 2.5–4 cm high × 5–7.5 cm wide, cupule wall 0.8–1 cm thick, enclosing 2345 of the nut, made up of 7–10 concentric rings set one above the other, thinly lamellate, finely toothed, outside and inside orangish tomentose, very silky at first then glabrous or slightly tomentose, interior lightly silky. Acorn turbinate or almost spherical, rounded or truncated at the end, 2–3 × 3–4 cm, at first tomentose, then glabrous, usually solitary or grouped on a short, robust spike; stylopodium present, about 5 mm in diameter. Acorns ripen in the first year. (le Hardÿ de Beaulieu & Lamant 2010; Huang et al. 1999).

Distribution  BhutanMyanmar Northeast China Guangxi, Xizang, Yunnan India Assam, Sikkim NepalThailand North

Habitat Mixed mesophytic forests in mountains at 1300–2500 m, in association with Q. leucotrichophora and Q. thomsoniana, Rhododendron grande, Castanopsis tribuloides, Lithocarpus pachyphyllus, Acer campbellii, Magnolia campbellii, Betula alnoides, Carpinus viminea, Symplocos lucida, Magnolia doltsopa, Magnolia cathcartii, Arundinaria racemosa and several other bamboo species.

USDA Hardiness Zone 8

RHS Hardiness Rating H4

Conservation status Near threatened (NT)

Taxonomic note The var. nigrinervis, originally described as a species in 1996, present in Xizang (Tibet) at around 2200 m, has been considered a synonym of Q. lamellosa since 2006 (le Hardÿ de Beaulieu & Lamant 2010).

Since its discovery by Buchanan-Hamilton in Nepal in 1802, Quercus lamellosa has smitten Western travelers with its imposing, lofty habit, luscious foliage, and voluminous, thickly ringed acorns. Sir Joseph Hooker described it as ‘by far the noblest species of Oak known’ (Hooker & Cathcart 1855); for le Hardÿ de Beaulieu & Lamant (2010) it is ‘le plus beaux de tous les chênes.’ In contrast, it makes a sorry sight in areas where it is savagely pruned to provide forage for livestock and frequently cut down for timber. Its allure for temperate-zone gardeners is heightened by its borderline hardiness, allowing it to survive in only the warmest areas, and even there tantalizing collectors by forming cupules that don’t materialize into its famed acorns.

In habitat it is found in pure stands or isolated in small groups in mountain forests in mild and humid climates influenced by monsoons. Though it can be found on steep slopes and ridges, it prefers deep, mellow humus soils or well-drained sandy loam on hills and moderate slopes. It appreciates a sunny aspect. Though in theory hardy to zone 8, it does not have strong resistance to frost or drought. It is sensitive to fire but resprouts after being cut down, coppicing well (le Hardÿ de Beaulieu & Lamant 2010).

The acorns are among the largest in the genus, their size enhanced by the thick cupules which enclose them. Large acorns may have evolved due to a need to produce larger and longer radicles, required for the seedling to become established in the type of soil they occupy (Vázquez Pardo 2015). A kilogram of Q. lamellosa acorns typically contains 60 acorns, compared to an average of over 200 for Q. robur (le Hardÿ de Beaulieu & Lamant 2010; Major 2002). Hooker (1855) reported that in a mast year the mass of these acorns on the roads around Darjeeling made them dangerous for riders, as they caused the horses to stumble. J.E. Smith’s original description (1814) likened them to small apples. The cupules are green and spongy when fresh, but when they dry they resemble brown rosebuds with recurved scales (The Oaks of Chevithorne Barton 2011).

The story of Q. lamellosa in cultivation is to large extent a litany of lamentation. Hooker (1855) remarked that acorns he sent back to England did not germinate as the cotyledons are very fleshy and the plumule sprouts as soon as the acorns are exposed to the heat of the plains. At Arboretum de la Bergerette in France, a seedling planted high on a hillside in the hope of avoiding frosts ‘disappeared without trace’ (Haddock 2012). Chevithorne Barton received one of their specimens from Carol Gurney because the species had failed in his garden in Suffolk, southeastern UK (The Oaks of Chevithorne Barton 2011). Even in Caerhays, which enjoys the mildest climate in the UK, trees grown from the earliest introduction to the country by Forrest in 1924 have struggled. They have proved quite tender and are frequently cut back by fairly mild frosts, though they reshoot from lower down the stem (Williams 2014). One of these trees reached 20 m × 29 cm dbh in 1984 but has since died; surviving trees measured 8 m in 2016, with dbh ranging from 23 to 58 cm (The Tree Register 2021). Le Hardÿ de Beaulieu & Lamant (2010) lugubriously predicted failure in any garden outside the zone de l’oranger (the zone of the orange, a French horticultural term roughly equivalent to zone 9b), pinning their hopes on the Basque Country and Cornwall. Nevertheless, the Tree Register (2021) records 10 living trees in UK gardens, ranging as far north as Castle Howard, North Yorkshire, with the tallest at Tregrehan. Several plants from different introductions grow there; the best, planted in 1996 and sourced in Yunnan, had reached 14 m in 2020 (T. Hudson pers. comm.). At Chevithorne Barton, a tree from seed collected in northeast Nepal reached 6.8 m in 2021, while another, of unknown origin, measured 4.2 m (J. MacEwen pers. comm. 2021). The Basque Country seems indeed to be propitious for the species: sound trees reached 5 m at Iturraran Botanical Garden in Spain and 8 m across the border in Arboretum Chocha, France (pers. obs. 2019).

In the Southern Hemisphere, a healthy tree grows at Eastwoodhill Arboretum in New Zealand, from seed collected in Nepal and planted out in 1989. It had reached 9 m in 2021 (B. Lyte, M. Weaver pers. comm.). At Hackfalls Arboretum, the oldest tree of three growing there was accessioned in 1996 as a plant from a local nursery, propagated as a cutting from a tree grown from seed. It had reached 6 m in 2004. Propagation from cuttings was also successful at Caerhays, though the resulting plants have proven even more tender than the original (Williams 2014).

In cultivation in temperate gardens, the species has not been sufficiently at ease as to reproduce. At Caerhays hope springs eternal each year as cupules form, only to be dashed when acorns fail to become flesh. The evergreen foliage also suffers and has shown damage in autumn, as if they had already had a cold winter (Williams 2021). The trees there are clearly semi-evergreen: Chassé (2017) found that in early summer Q. lamellosa specimens had dropped nearly all their leaves.

Grafting of section Cyclobalanopsis oaks has proven particularly problematic due to compatibility issues, but Brian Humphrey (2019) reported some success grafting Q. lamellosa on Q. myrsinifolia rootstock. He suggested that the rootstock in an exceptional successful graft in a trial batch might form the foundation of a mother plant to produce inter-stems showing compatibility with Q. lamellosa. These then could be used to graft Q. lamellosa on Q. myrsinifolia using the double-working technique, in which a portion of inter-stem is grafted to the rootstock, then scion is grafted to the inter-stem.

In its native range, the wood of Q. lamellosa is used in construction and prized for its durability. The heartwood is greyish brown to reddish brown, with impressive medullary rays and fine grain, but it is knotty, dries with difficulty, and is said to lack malleability for milling and woodwork. It is used for heating and making charcoal, and leaves and branches are lopped for fodder. Due to this practice it is common to see Q. lamellosa stands severely altered by human intervention, the looming canopies thinned and reduced to slim pollards. The astringent acorns and bark are used in traditional medicine to treat hemorrhages and dysentery; the bark is rich in tannins and used in the tanning industry (le Hardÿ de Beaulieu & Lamant 2010). Carrero and Strijk (2020) report its area of occupancy is restricted, classifying the species as Near Threatened due to timber extraction, habitat conversion, and fire; they note that little up-do-date information is available on the actual status of populations, especially in the western part of the species’ range.

The common name in Chinese can be translated as ‘flakey evergreen oak’.

When Smith described the species in 1814, he proposed the common name ‘many-cupped oak’, which has however not caught on. The epithet lamellosa derives from lamella, diminutive of lamina, originally a thin piece of metal or wood, and by extension the tender shell of a fruit or the gills of a mushroom (Wiktionary 2021). Smith used it in reference to the cupule’s imbricated layers (Smith 1814).