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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids I
Ordo: Fagales

Familia: Fagaceae
Genus: Castanopsis
Species

C. acuminatissima – C. amabilis – C. annamensis – C. argentea – C. argyrophylla – C. arietina – C. armata – C. birmanica – C. boisii – C. borneensis – C. brevispinula – C. buruana – C. calathiformis – C. cambodiana – C. carlesii – C. castanicarpa – C. catappifolia – C. cavaleriei – C. ceratacantha – C. cerebrina – C. chapaensis – C. chevalieri – C. chinensis – C. choboensis – C. chunii – C. clarkei – C. clemensii – C. concinna – C. costata – C. crassifolia – C. cryptoneuron – C. curtisii – C. cuspidata – C. delavayi – C. densinervia – C. densispinosa – C. diversifolia – C. dongchoensis – C. echinocarpa – C. echinophora – C. endertii – C. evansii – C. eyrei – C. faberi – C. fargesii – C. ferox – C. fissa – C. fleuryi – C. fordii – C. formosana – C. foxworthyi – C. fulva – C. gamblei – C. glabra – C. glabrifolia – C. griffithii – C. guinieri – C. hainanensis – C. harmandii – C. hsiensiui – C. hupehensis – C. hypophoenicea – C. indica – C. inermis – C. javanica – C. jianfenglingensis – C. jinpingensis – C. johorensis – C. jucunda – C. kawakamii – C. kweichowensis – C. lamontii – C. lanceifolia – C. lecomtei – C. longipes – C. longipetiolata – C. longispina – C. lucida – C. malaccensis – C. malipoensis – C. megacarpa – C. mekongensis – C. microphylla – C. motleyana – C. namdinhensis – C. neocavaleriei – C. nephelioides – C. nhatrangensis – C. ninhhoensis – C. oblonga – C. oligoneura – C. orthacantha – C. ouonbiensis – C. oviformis – C. paucispina – C. pedunculata – C. philipensis – C. phuthoensis – C. pierrei – C. piriformis – C. platyacantha – C. poilanei – C. pseudohystrix – C. psilophylla – C. purpurea – C. purpurella – C. remotidenticulata – C. rhamnifolia – C. ridleyi – C. rockii – C. rufotomentosa – C. schefferiana – C. sclerophylla – C. scortechinii – C. selangorensis – C. semifabri – C. siamensis – C. sieboldii – C. sieboldii – C. sieboldii – C. symmetricupulata – C. tcheponensis – C. tessellata – C. thaiensis – C. tibetana – C. tonkinensis – C. torulosa – C. touranensis – C. tranninhensis – C. tribuloides – C. trinervis – C. tungurrut – C. undulatifolia – C. wallichii – C. wattii – C. wenchangensis – C. wilsonii – C. xichouensis
Paleospecies

†C. bulgarica – †C. crepetii – †C. franklinensis
Name

Castanopsis (D.Don) Spach, Hist. Nat. Vég. 11: 185 (1842), nom. cons.
Type species: Castanopsis armata (Roxb.) Spach Hist. Nat. Vég. 11: 185 (1842)

Synonyms

Heterotypic
Balanoplis Raf., Alsogr. Amer.: 29 (1838)
Callaeocarpus Miq., Pl. Jungh.: 13 (1851)
Pasaniopsis Kudô, Syst. Bot. Useful Pl. Jap.: 134 (1922)
Shiia Makino, J. Jap. Bot. 5: 23 (1928)
Chlamydobalanus (Endl.) Koidz., Acta Phytotax. Geobot. 9: 108 (1940)

Distribution
Native distribution areas:
References
Primary references

Spach, É. 1842. Histoire Naturelle des Végétaux. Phanérogames. Tome 11. 444 pp. Librairie Encyclopédique de Roret, Paris. BHL Reference page. : 11: 142, 185.

Additional references

Wolfe, Jack A. (1968) Paleogene biostratigraphy of nonmarine rocks in King County, Washington. U.S. Geological Survey Professional Paper 571.
Manchester, Steven. R. (1994) Fruits and seeds of the Middle Eocene Nut Beds Flora, Clarno Formation, Oregon. Palaeontographica Americana 58: 1–205.
Vuong, D.H.; Xia, N.-H. 2014: Two new species in Castanopsis (Fagaceae) from Vietnam and their leaf cuticular features. Phytotaxa 186(1): 29–41. DOI: 10.11646/phytotaxa.186.1.2 Reference page.
Chen, L.; Li, X.-W.; Li, J.-Q. 2013: Taxonomic notes on Castanopsis (Fagaceae, Castaneoideae) from China. Phytotaxa 146(2): 50–60. DOI: 10.11646/phytotaxa.146.2.2 Reference page.

Links

Govaerts, R. et al. 2021. Castanopsis in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2021 Jun 25. Reference page.
Govaerts, R. et al. 2021. Castanopsis in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2021 Jun 25. Reference page.
International Plant Names Index. 2021. Castanopsis. Published online. Accessed: Jun 25 2021.
Tropicos.org 2021. Castanopsis. Missouri Botanical Garden. Published on the internet. Accessed: 2021 Jun 25.
Hassler, M. 2021. Castanopsis. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2021. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2021 Jun 25. Reference page.
Hassler, M. 2021. World Plants. Synonymic Checklist and Distribution of the World Flora. . Castanopsis. Accessed: 25 Jun 2021.

Vernacular names
English: Chinquapin
Esperanto: Kastanopso
日本語: シイ属
русский: Кастанопсис
українська: Кастанопсіс
中文: 锥属

Castanopsis, commonly called chinquapin or chinkapin, is a genus of evergreen trees belonging to the beech family, Fagaceae. The genus contains about 140 species,[1] which are today restricted to tropical and subtropical eastern Asia. A total of 58 species are native to China, with 30 endemic; the other species occur further south, through Indochina to, Indonesia and the Philippines, mountainous areas of Taiwan, and also in Japan. The English name chinkapin is shared with other related plants, including the golden chinkapins of the Pacific United States, which are sometimes included within Castanopsis but are more often considered a separate but very closely related genus, Chrysolepis.

They show many characters typical of Fagaceae. They are at least large shrubs but some species grow into sizeable trees. Their leaves are usually tough and much sclerotized and have a well-developed cuticula. Their flowers are unisexual, and the male ones are borne in erect catkins. The epigynous female flowers produce a single seed each but are congregated in small clusters. The fruit is a calybium, the kind of encased nut typical of Fagaceae. The calybium (nut) resembles a pointed acorn; the cupule (casing) is hard like that of beechnuts and spiny like that of chestnuts. Three thickened ridges run the length of the calybium's shell.

Uses and ecology

In their rather circumscribed area of occurrence, Castanopsis are able to inhabit a wide range of temperate to tropical habitat and are often keystone species in their ecosystems. They are plentiful in ecotones as diverse as Borneo montane rain forests, Taiwan subtropical evergreen forests and Northern Triangle temperate forests. Generally they are common in Fagales-dominated montane forests and temperate to subtropical laurel forests. In the latter, they are characteristic elements of the climax vegetation in essentially their entire continental Asian range, as well as on Taiwan.
Strip mining for fossil Castanopsis in the form of lignite ("brown coal"). Garzweiler (Germany), 2006. Click to enlarge; note Bagger 288 and 289 in the left background.

Plants of this genus grow on many soil types, as long as they are not calcareous. Several species have adapted to podsolic, peat bog, swamp and other acidic and/or wet soils, or to the poor dry soils common in arid habitat. Around the Oligo-Miocene boundary, Castanopsis grew abundantly along rivers and in bogs and swamps of then-subtropical Europe. The prehistoric plant community Castanopsietum oligo-miocenicum is the source of much of the lignite ("brown coal") deposits in Western and Central Europe.

Most species yield valuable timber but some have become rare due to unsustainable logging; C. catappaefolia is even in danger of extinction. As noted above, however, perhaps the most important use for Castanopsis wood is in its fossil form. 175,400 metric tons of lignite - much of which was former chinkapin trees - were mined in Germany in 2001.

As with many Fagaceae, the nuts of many Castanopsis species are edible. The trees may be grown for their nuts, but more often they are used as forestry or ornamental trees and the nuts are collected opportunistically. Among many animals, such as tits, corvids, rodents, deer and pigs, the nuts are popular as food too.

Meguro, Tokyo and Matsudo, Chiba in Japan use shii (椎; Castanopsis cuspidata)[verification needed] as one of their municipal symbols. The well-known and commercially important shiitake mushroom likes to grow on the logs of C. cuspidata and derives its common name from this: shii-take simply means "Castanopsis cuspidata mushroom".
Shii (Castanopsis cuspidata) parts drawing
Castanopsis sieboldii leaves
Species

Main article: List of Castanopsis species
Formerly placed here

Castanea henryi (Skan) Rehder & E. H. Wilson (as C. henryi Skan)
Chrysolepis

Fossil record

Fossil species known from Miocene Europe are:

Castanopsis pyramidata (Menzel) Kirchheimer
Castanopsis salinarum (Unger) Kirchheimer
Castanopsis schmidtiana (Geinitz) Kräusel

These are known and identifiable from their fruit. It is not entirely clear if they belong here or into Chrysolepis, but the pattern of biogeography - with the two genera being most diverse around the Pacific but absent from North America east of the Rocky Mountains[verification needed] suggests that they are indeed correctly assigned to Castanopsis. In addition, two form taxa refer to the remains of these trees, at least in part: the fossil wood Castanoxylon eschweilerense and the fossil pollen Tricolporopollenites cingulum ssp. pusillus.[2]

Castanopsis praefissa and Castanopsis praeouonbiensis are described from fossil specimens collected from the upper Miocene Shengxian Formation, Zhejiang Province, Southeast China. The fossil leavesare obovate to elliptical with serration mostly confined to the upper 1/3 of the leaf. The fossil cupule (upper part of the acorn) is globose with branched spines, and a broadly ovate nut scar. The fossil leaves and cupule have been compared with those extant in this genus. Castanopsis praefissa shows the closest affinity to C. fissa, and C. praeouonbiensis closely resembles C. ouonbiensis. Castanopsis praeouonbiensis and C. praefissa became extinct in this area because of the cooling climate from the late Miocene to the present day in Zhejiang Province.[3]

The oldest known records of the genus are those of Castanopsis rothwellii and Castaneophyllum patagonicum from the Eocene of Patagonia.[4]
References

Strijk, J.S. (September 4, 2018). "Castanopsis - On: asianfagaceae.com – The complete database for information on the evolutionary history, diversity, identification and conservation of over 700 Species of Asian trees". Asian Fagaceae. Archived from the original on 2017-06-27. Retrieved May 4, 2021.
Gee, Carole T.; Sander, P. Martin; Petzelberger, Bianka E. M. (2003). "A Miocene rodent nut cache in coastal dunes of the Lower Rhine Embayment, Germany". Palaeontology. 46 (6): 1133–1149. doi:10.1046/j.0031-0239.2003.00337.x. ISSN 1475-4983.
Li, Ruiyun; Sun, Bainian; Wang, Qiujun; Ma, Fujun; Xu, Xiaohui; Wang, Yunfeng; Jia, Hui (2014). "Two new Castanopsis (Fagaceae) species based on cupule and foliage from the upper Miocene of eastern Zhejiang, China". Plant Systematics and Evolution. 301 (1): 25–39. doi:10.1007/s00606-014-1051-7. S2CID 18909589.
Wilf, Peter; Nixon, Kevin C.; Gandolfo, María A.; Cúneo, N. Rubén (2019-11-14). "Response to Comment on "Eocene Fagaceae from Patagonia and Gondwanan legacy in Asian rainforests"". Science. 366 (6467): eaaz2297. doi:10.1126/science.aaz2297. ISSN 0036-8075. PMID 31727802. S2CID 208032602.

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