Biology:Quercus crispula

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Short description: Species of tree

Water Oak
Quercus crispula in Ibaraki Prefecture
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fagales
Family: Fagaceae
Genus: Quercus
Species:
Q. crispula
Binomial name
Quercus crispula
Blume, 1851[1]
Synonyms[5]

Quercus mongolica subsp. crispula Blume [2]
Quercus mongolica var. grosseserrata (Bl.) Rehd. & Wils.[3]
Quercus mongolica subsp. crispula (Blume) Menitsky[4] (and H.Ohashi)[1]

Quercus crispula, commonly known as 'water oak' (Japanese: 水楢, Hepburn: mizunara), Japanese oak and Mongolian oak, is a deciduous broad-leaved tree of the genus Quercus. Quercus mongolica var. crispula, it is considered a variety of Quercus mongolica by some authorities, and is widely distributed in Northeast Asia from Sakhalin to southern Japan, and parts of Russia, Korea, and China. It is often colocated with Fagus crenata (Japanese beech) and Acer mono (Painted maple) in dense deciduous forests. The nuts can be eaten. The wood is highly valued for making whisky and is also used for furniture and construction. The outer bark has medicinal properties.

Description

Quercus crispula trees reach 9 to 18 meters (30 to 59 ft) in height, sometimes reaching 27 meters (89 ft) with a canopy spread of 7.5 to 17 meters (25 to 56 ft).[6] Trunks have a diameter up to 1.5 meters (4 ft 11 in).[7] The leaves are dark green lighter green below and glabrous. Leaves are tapered obovate to obobate-oblong that are 10 to 20 centimeters (3.9 to 7.9 in) in length with 7-10 broad coarse serrated teeth that are more wavy than a typical oak.[6] Flowers of about 5 centimeters (2.0 in) in length bloom in May–June, and the acorns ripen in the fall.[6] Male flowers are yellow-green and female flowers are reddish.[6] Abundant acorns grow while the trees are still rather young. Autumn colors are red or golden brown.[8] The average age of Q. crispula is 368 years with a maximum age of 772 years.[9]

Compared to the continental Quercus mongolica, Q. crispula has a straighter trunk and starts growing later in the spring so late frosts are less detrimental. Because of its winter hardiness, it is a popular import to Finland.[8] It grows in hardiness zones 5-8.[6] Q. crispula is wind-pollinated, and monoecious. It lives to be 200-300 years old.[7]

  • Bark
    Bark
  • Leaves
    Leaves
  • Leaves and acorns
    Leaves and acorns
  • Flowers
    Flowers
  • Immature fruit
    Immature fruit
  • Mature fruit
    Mature fruit

Taxonomy

Quercus crispula Blume was first scientifically described by Carl Ludwig Blume in 1851.[1] Some authorities consider Q. crispula a variety of Quercus mongolica—var. crispula (Mongolian oak),[2][4][10] while others consider it a separate species, Q. crispula.[11] Another scientific name used is Quercus mongolica var. grosseserrata.[3]

The common name used in the whisky distilling business is the Japanese name mizunara (水楢), lit. 'water oak'.[12] Other common names are Mongolian oak and Japanese oak.[6][13]

Etymology

The generic name Quercus is Latin for "oak", derived from Proto-Indo-European *kwerkwu-, "oak", which is also the origin of the name "fir", another important or sacred tree in Indo-European culture. The word "cork", for the bark of the cork oak, similarly derives from Quercus.[14] The common name "oak" is from Old English ac (seen in placenames such as Acton, from ac + tun, "oak village"),[15] which in turn is from Proto-Germanic *aiks, "oak".[16] Crispula is the feminine singular form of the Latin adjective crispulus, meaning "curly" or "crimped".[17][18]

Distribution and habitat

Quercus crispula native distribution map in Japan

Quercus crispula is native to all of Japan's main islands and also on Sakhalin Island, the Kuril Islands, Amur, Khabarovsk, Korea, Manchuria, and Primorsky Krai.[8][10] It is often colocated with Fagus crenata (Japanese beech) and Acer mono (Painted maple). All three species function as canopy trees, with F. crenata being dominant.[19][20] In parts of its range, other deciduous trees often found with Q. crispula include: Fagus japonica, Magnolia obovata, Fraxinus lanuginosa, Acer japonicum, Quercus serrata, and Carpinus laxiflora.[21][22] Q. crispula prefers a colder climate than the closely related Quercus serrata and Quercus acutissima. It grows naturally from the mountains of Japan to the subalpine zone. Along with beech, it is one of the main tree species of deciduous broad-leaved forests in Japan, preferring slightly brighter places than beech.[23]

Quercus dentata (Qd) (Japanese Emperor Oak) cannot tolerate the extreme cold of northern Hokkaido, but Q. crispula (Qc) can. In more southerly parts of Hokkaido, Q. dentata lives in coastal areas while Q. crispula tends to live more inland. In the more northern parts of the island, these two species have experienced introgression and they are interfertile, producing shoots that grow and can reproduce; resulting in a coastal Qc ecotype wih Qd-like traits. The coastal Qc are intermediary between the two parent species in genotypes and phenotypes.[24] There have been conflicting studies about whether Q. crispula had one lineage that migrated northward from southern Japan or that one plus another one that migrated southward from northern Hokkaido. Genetic studies show that the southern lineage specimens only migrated north to the Oshima Peninsula, the very southern tip of Hokkaido, after the Last Glacial Maximum (LGM), more than 20,000 years ago. The other lineage stayed in central and northern Hokkaido and admixture, resulting in multiple lineages in Hokkaido.[7][25]

Ecology

Acronicta catocaloida, which feeds on Q. crispula

Quercus crispula is not generally subjected to serious insect or disease attacks,[6] but can be a victim of leaf miners.[26] About 84 percent of seedlings die within two years, most under or near the canopy and most from herbivorey by lepidopteran larva.[27] At least seven species in the genus Phyllonorycter feed on Q. crispula: P. acutissimae, P. similis, P. cretata, P. pseudolautella, P. pygmaea, P. mongolicae, and P. matsudai.[28] Other species that feed on Q. crispula are: Caloptilia mandschurica, Caloptilia sapporella,[29] and Acronicta catocaloida.[30] Q. crispula refoliates at a faster rate after insect defoliation than Fagus crenata.[31]

Like many other oaks, Quercus crispula reproduction involves a pattern of masting, which is characterized by significant variation in acorn production from year to year. Heavy masting occurred in alternating years but 1995 this pattern became disrupted, apparently due to climate change. synchrony occurs between individual trees within a stand of trees. The weevils in the genus Curculio infest 25-75 percent of the mature acorns: C. sikkimensis, C. dentipes, and C. distinguendus, disrupting tree reproduction. These weevils have a prolonged diapause of two years or longer. The weevil species do not emerge in the same year; each species has its own emergence timing.[32]

Cultivation

Quercus crispula grows best grown in rich, moist, well-drained loams, including sandy loams, in full sun. It tolerates drought, clay soil, and dry soil well.[6] Soils should have a pH balance that is mildly acid, neutral or mildly alkaline.[33] It does not grow well in full shade, but tolerates some shade.[6] Encouraging rapid tree growth does not always enhance quality, but practicing long-rotation forestry does.[34]

Uses

Amahagan (Nagahama spelled backwards) mizunara whisky

Quercus crispula is most widely known outside Japan for its use in barrels to age Japanese and Scotch whisky. The wood is expensive, has many twists, has fewer tyloses than other oaks, has poor watertightness, and its high water content requires a two-year drying time; all making it difficult for coopers to work with.[35] It can be hard to obtain and is expensive.[36] Despite these issues, Q. crispula wood has received international acclaim as a material that can brew a delicate flavor and unique aroma completely different from other oak barrels. Whisky connoisseur David Broom describes the aroma and taste as most reminiscent of aloeswood and similar to sandalwood with hint of coconut, camphor mintiness, and cedar.[12] The link between the aroma of mizunara and temples is often referred to as "temple smell". The reason is the wood has some of the same molecules as fungus-infected aloeswood, which is found in species of the genus Aquilaria. Aloeswood is also used in production of temple incense; hence the similarity.[37][38][39] Q. crispula is also used in some distillery washbacks.[40] The most prized Q. crispula trees for barrel making come from Hokkaido, where there are still virgin forests. Hokkaido's oak trees are exported because of the quality and taste these oaks impart to whisky making.[41][42] Hokkaido is well-suited to making whisky because of the long and cold winters, warm summers, peat, and many Q. crispula trees.[43]

Other uses

In addition to distillery barrels, the wood is used in high-end furniture and building materials.[44] In particular, Hokkaido varieties are considered to be of good quality.[41][42] Q. crispula wood and chips also make an excellent host bed for the cultivation of shiitake mushrooms.[45]

Extract made from the outer bark of Q. crispula has outstanding effectiveness against the parasite parasite Toxoplasma gondii, which infects warm-blooded animals and causes toxoplasmosis. The agents in Q. crispula that enable this are three pentacyclic triterpenoids: 29-norlupane-3,20-dione, oleanolic acid acetate, and ursolic acid acetate.[46][47]

During the Jōmon period, nuts (acorns, chestnuts, and horse chestnuts) were important as a preserved food for winter, especially in the eastern part of Japan, and were stored in underground pits. The acorns of Q. crispula contain astringent tannins and cannot be eaten as they are, but must be processed to become edible.[48]

See also

  • Kodama (spirit), Japanese spirits that inhabit trees
  • Protected Forests (Japan)

References

  1. ↑ 1.0 1.1 1.2 "Quercus crispula Blume". Global Biodiversity Information Facility. https://www.gbif.org/species/2879697. 
  2. ↑ 2.0 2.1 "Quercus crispula Blume". Plants of the World Online. Kew Royal Botanic Gardens. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:296012-1. 
  3. ↑ 3.0 3.1 "Quercus mongolica var. grosseserrata (Blume) Rehder & E.H.Wilson". Global Biodiversity Information Facility. https://www.gbif.org/species/2879691. 
  4. ↑ 4.0 4.1 "Quercus mongolica Fisch.". Trees and Shrubs Online. International Dendrology Society. https://www.treesandshrubsonline.org/articles/quercus/quercus-mongolica. 
  5. ↑ "Report from the Oak ICRA checklist". The Oak Names Checklist. The International Oak Society. Trehane, P. (2007 onwards). http://www.oaknames.org/search/fullname.asp?id=2463. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 "Quercus mongolica var. grosseserrata". Missouri Botanical Garden. https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=280778&isprofile=1&basic=serrata. 
  7. ↑ 7.0 7.1 7.2 Ohsawa, Takafumi (2011). "The genetic structure of Quercus crispula in northeastern Japan as revealed by nuclear simple sequence repeat loci". Journal of Plant Research 124 (6): 645–654. doi:10.1007/s10265-010-0402-x. PMID 21258956. Bibcode: 2011JPlR..124..645O. 
  8. ↑ 8.0 8.1 8.2 "Quercus mongolica subsp. crispula – Mizu-nara". Mustila Arboretum. August 10, 2023. https://mustila.fi/en/plants/quercusmongolicacrispula. 
  9. ↑ Osumi, Katsuhiro; Masaki, Takashi (2023). "Longevity of tall tree species in temperate forests of the northern Japanese Archipelago". Journal of Forest Research 28 (5): 333-344. doi:10.1080/13416979.2023.2207261. 
  10. ↑ 10.0 10.1 "Quercus mongolica var. crispula (Blume) H.Ohashi". Plants of the World Online. Kew Royal Botanic Gardens. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:954264-1. 
  11. ↑ Ohsawa, Takafumi; Tsuda, Yoshiaki; Saito, Yoko; Ide, Yuji (2011). "The genetic structure of Quercus crispula in northeastern Japan as revealed by nuclear simple sequence repeat loci". Journal of Plant Research 124 (6): 645–654. doi:10.1007/s10265-010-0402-x. PMID 21258956. Bibcode: 2011JPlR..124..645O. 
  12. ↑ 12.0 12.1 Broom, Dave (2017). The Way of Whisky: A Journey Around Japanese Whisky (Kindle). London: Mitchell Beazley. pp. 6, 119–120. ISBN 978-1784723958. 
  13. ↑ Yoshida, Toshiya. "Dynamica of Quercus crispula (Japanese oak) Populations in Natural Mixed Forests Under a Selection Cutting Regime in Northern Japan". Forest Service, United States Department of Agriculture. pp. 192–194. https://www.srs.fs.usda.gov/pubs/gtr/gtr_srs278/gtr_278.pdf_abst_109.pdf. 
  14. ↑ "Quercus (n.)". https://www.etymonline.com/word/quercus. 
  15. ↑ Mills, A. D. (1993). A Dictionary of English Place-Names. Oxford University Press. p. 2. ISBN 978-0192831316. 
  16. ↑ "Oak (n.)". https://www.etymonline.com/word/oak. 
  17. ↑ "Crispŭlus". Latin Dictionary. https://www.online-latin-dictionary.com/latin-english-dictionary.php?lemma=CRISPULUS100. 
  18. ↑ "Crispula". Latin Dictionary. https://www.online-latin-dictionary.com/latin-english-dictionary.php?parola=crispula. 
  19. ↑ Okaura, T.; Harada, K. (2002). "Phylogeographical structure revealed by chloroplast DNA variation in Japanese Beech (Fagus crenata Blume)". Heredity (Nature Publishing Group) 88 (4): 322–329. doi:10.1038/sj.hdy.6800048. PMID 11920142. Bibcode: 2002Hered..88..322O. http://www.nature.com/hdy/journal/v88/n4/pdf/6800048a.pdf. Retrieved October 23, 2025. 
  20. ↑ Cao, K. F.; Ohkubo, T. (1999). "Suppression and Release during Canopy Recruitment in Fagus Crenata and Acer Mono in Two Old-Growth Beech Forests in Japan". Plant Ecology 145 (2): 281–290. doi:10.1023/A:1009888128269. Bibcode: 1999PlEco.145..281C. 
  21. ↑ Homma, Kohsuke (1997). "Effects of Snow Pressure on Growth Form and Life History of Tree Species in Japanese Beech Forest". Journal of Vegetation Science 8 (6): 782–783. doi:10.2307/3237022. Bibcode: 1997JVegS...8..781H. 
  22. ↑ Nagamatsu, Dai; Seiwa, Kenji; Sakai, Akiko (2002). "Seedling Establishment of Deciduous Trees in Various Topographic Positions". Journal of Vegetation Science 13 (1): 35–44. doi:10.1111/j.1654-1103.2002.tb02021.x. Bibcode: 2002JVegS..13...35N. 
  23. ↑ "Oak-hunting in Japan, October 2007". International Oak Society. December 31, 2007. https://www.internationaloaksociety.org/content/oak-hunting-japan-october-2007. 
  24. ↑ Nagamitsu, Teruyoshi (2020). "Environment-Dependent Introgression from Quercus Dentata to a Coastal Ecotype of Quercus Mongolica var.Crispula in Northern Japan". The New Phytologist 226 (4): 1018–1028. doi:10.1111/nph.16131. PMID 31424559. Bibcode: 2020NewPh.226.1018N. 
  25. ↑ Liu, Huan-Zhen; Harada, Ko (2014). "Geographic distribution and origin of the chloroplast T/C-type in Quercus mongolica var. crispula in northeastern Japan". Plant Species Biology 29 (2): 207–211. doi:10.1111/1442-1984.12008. Bibcode: 2014PSBio..29..207L. 
  26. ↑ Ishida, Takahide A.; Hattori, Kouhei; Kimura, Masahito T. (December 2004). "Abundance of leafminers and leaf area loss by chewing herbivores in hybrids between Quercus crispula and Quercus dentata". Canadian Journal of Forest Research 34 (12): 2501–2507. doi:10.1139/x04-132. Bibcode: 2004CaJFR..34.2501I. 
  27. ↑ Wada, Naoya; Murakami, Masashi; Yoshida, Kunikichi (June 2000). "Effects of herbivore-bearing adult trees of the oak Quercus crispula on the survival of their seedlings". Ecological Research 15 (2): 219–227. doi:10.1046/j.1440-1703.2000.00343.x. Bibcode: 2000EcoR...15..219W. 
  28. ↑ Ishida, Takahide A. (2003). "Differentiation and Hybridization between Quercus crispula and Q. Dentata (Fagaceae): Insights from Morphological Traits, Amplified Fragment Length Polymorphism Markers, and Leafminer Composition". American Journal of Botany 90 (5): 769–776. doi:10.3732/ajb.90.5.769. PMID 21659174. 
  29. ↑ Kim, Da-Som; Shin, Young-Min; Lee, Ji-Young; Bong-Kyu, Byun (2022). "Taxonomic Review of the Genus Caloptilia Hübner, 1825 (Lepidoptera: Gracillariidae) with Descriptions of Three New Species and Seven Newly Recorded Species from Korea". Insects 13 (12). doi:10.3390/insects13121107. PMID 36555017. 
  30. ↑ Sohn, Jae-Cheon; Kim, Nang-Hee; Choi, Sei-Woong (December 2017). "Morphological and functional diversity of foliar damage on Quercus mongolica Fisch. ex Ledeb. (Fagaceae) by herbivorous insects and pathogenic fungi". Journal of Asia-Pacific Biodiversity 10 (4): 498–508. doi:10.1016/j.japb.2017.08.001. 
  31. ↑ Nakajima, Haruki (2018). "Refoliation of Deciduous Canopy Trees Following Severe Insect Defoliation: Comparison of Fagus crenata and Quercus crispula". Plant Ecology 219 (6): 665–675. doi:10.1007/s11258-018-0825-3. Bibcode: 2018PlEco.219..665N. 
  32. ↑ Maeto, Kaoru; Ozaki, Kennichi (2003). "Prolonged Diapause of Specialist Seed-Feeders Makes Predator Satiation Unstable in Masting of Quercus Crispula". Oecologia 137 (3): 392–398. doi:10.1007/s00442-003-1381-6. PMID 13680352. Bibcode: 2003Oecol.137..392M. 
  33. ↑ "Quercus mongolica grosseserrata - (Blume.)Rehder.&E.H.Wilson". Plants for a Future. https://pfaf.org/user/Plant.aspx?LatinName=Quercus+mongolica+grosseserrata. 
  34. ↑ Nakaya, Akira (December 2025). "Growth characteristics of standing individual Japanese oak (Quercus crispula) qualifying for barrel timber in a secondary forest". Forest Ecology and Management 598. doi:10.1016/j.foreco.2025.123183. 
  35. ↑ van Eycken, Stefan (April 28, 2017). "Adventures in Mizunara: How this wood can transform a whisky". Whisky Magazine. https://whiskymag.com/articles/adventures-in-mizunara/. 
  36. ↑ Teo, HongFu (2025). "Assessing the Feasibility of Using Small Pieces of Mizunara Oak as Inner Staves within Ex-Bourbon Casks for Whisky Maturation: An Opportunity for Sustainable Bioresource Management?". Journal of the American Society of Brewing Chemists 83 (2): 137–147. doi:10.1080/03610470.2024.2440685. 
  37. ↑ Broom 2017, p. 247
  38. ↑ Ng, L. T.; Chang, Y. S.; Kadir, A. A. (1997). "A review on agar (gaharu) producing Aquilaria species". Journal of Tropical Forest Products 2 (2): 272–285. 
  39. ↑ Shivanand, Pooja; Arbie, Nurul Fadhila; Krishnamoorthy, Sarayu; Ahmad, Norhayati (May 2022). "Agarwood—The Fragrant Molecules of a Wounded Tree". Molecules 27 (11). doi:10.3390/molecules27113386. PMID 35684324. 
  40. ↑ Broom 2017, p. 98
  41. ↑ 41.0 41.1 White, Merry (2019). "Liquid Power: Advanced Orientalism and True Taste in Japanese Whiskies". Gastronomica 19 (1): 115–118. doi:10.1525/gfc.2019.19.1.115. 
  42. ↑ 42.0 42.1 Gladman, Anthony (April 12, 2024). "Mizunara oak explained". Decanter. https://www.decanter.com/spirits/mizunara-oak-explained-526736/. 
  43. ↑ Broom 2017, pp. 144, 297
  44. ↑ Hasegawa, Toshio (April 2018). "Characteristic Aromas of Quercus crispula (Japanese Oak)". Natural Product Communications 13 (4): 475–478. doi:10.1177/1934578X1801300424. 
  45. ↑ Sekino, Noboru; Jiang, Zhuoqiu (2021). "Fuel and material utilization of a waste shiitake (Lentinula edodes) mushroom bed derived from hardwood chips". Journal of Wood Science 67 (1). doi:10.1186/s10086-020-01935-7. 
  46. ↑ Endo, Marina (2019). "Isolation, structure determination and structure–activity relationship of anti-toxoplasma triterpenoids from Quercus crispula Blume outer bark". Journal of Wood Science 65 (3): 1–11. doi:10.1186/s10086-019-1782-8. Bibcode: 2019JWSci..65....3E. 
  47. ↑ Taib, Mehdi (July 2020). "Medicinal Uses, Phytochemistry, and Pharmacological Activities of Quercus Species". Evidence-Based Complementary and Alternative Medicine. doi:10.1155/2020/1920683. PMID 32802116. 
  48. ↑ Kawashima, Takamune (September 2015). "Food processing and consumption in the Jōmon". Quaternary International 404: 16–24. doi:10.1016/j.quaint.2015.08.040. 

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