|Calybia (nuts) of Castanopsis sieboldii|
About 120; see text
Limlia Masamune & Tomiya
Castanopsis, commonly called chinquapin or chinkapin, is a genus of evergreen trees belonging to the beech family, Fagaceae. The genus contains about 120 species, 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, 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.
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".
- Castanopsis acuminatissima (Blume) A. DC. (= Castanea acuminatissima Blume, Quercus junghuhnii Miq.)
- Castanopsis argentea (Blume) A. DC. (= Castanea argentea (Blume) Blume)
- Castanopsis argyrophylla King ex Hook. f.
- Castanopsis borneensis King
- Castanopsis buruana Miq.
- Castanopsis calathiformis
- Castanopsis carlesii (Hemsl.) Hayata (= Quercus carlesii Hemsl.)
- Castanopsis catappaefolia
- Castanopsis ceratacantha
- Castanopsis cerebrina
- Castanopsis choboensis
- Castanopsis chunii
- Castanopsis clarkei
- Castanopsis clemensii Soepadmo
- Castanopsis concinna
- Castanopsis costata (Blume) A.DC.
- Castanopsis crassifolia
- Castanopsis curtisii
- Castanopsis cuspidata – Japanese Chinquapin, shii
- Castanopsis delavayi Franch.
- Castanopsis densinervia Soepadmo
- Castanopsis diversifolia (Kurz) King ex Hook. f. (= Castanea diversifolia Kurz)
- Castanopsis endertii Hatus. ex Soepadmo
- Castanopsis evansii Elmer
- Castanopsis eyrei (Champ. ex Benth.) Tutcher (= Castanopsis caudata Franch., Quercus eyrei Champ. ex Benth.)
- Castanopsis fabri Hance (= Castanopsis stellatospina Hayata)
- Castanopsis fargesii Franch. (= Castanopsis taiwaniana Hayata)
- Castanopsis fissa
- Castanopsis fordii
- Castanopsis foxworthyi Schottky
- Castanopsis fulva Gamble
- Castanopsis globigemmata
- Castanopsis hainanensis
- Castanopsis hypophoenicea (Seemen) Soepadmo
- Castanopsis hystrix
- Castanopsis indica (Roxb. ex Lindl.) A. DC.
- Castanopsis inermis (Lindl.) Benth. & Hook. f. (= Callaeocarpus sumatrana Miq., Castanea inermis Lindl., Castanopsis sumatrana (Miq.) A. DC.)
- Castanopsis javanica (Blume) A. DC. (= Castanea javanica (Blume) Blume, Fagus javanica Blume, Quercus discocarpa Hance, Quercus javanica (Blume) Drake)
- Castanopsis kawakamii
- Castanopsis kweichowensis
- Castanopsis lamontii
- Castanopsis lanceifolia (Kurz) Hickel & A. Camus
- Castanopsis longzhouica
- Castanopsis lucida (Nees) Soepadmo
- Castanopsis megacarpa Gamble
- Castanopsis mekongensis
- Castanopsis microphylla Soepadmo
- Castanopsis motleyana King
- Castanopsis nephelioides
- Castanopsis oligoneura Soepadmo
- Castanopsis orthacantha
- Castanopsis ouonbiensis
- Castanopsis oviformis Soepadmo
- Castanopsis paucispina Soepadmo
- Castanopsis pedunculata Soepadmo
- Castanopsis philipensis (Blanco) S. Vidal (= Fagus philipensis Blanco)
- Castanopsis platyacantha
- Castanopsis psilophylla Soepadmo
- Castanopsis rockii
- Castanopsis sclerophylla (Lindl. & Paxton) Schottky (= Quercus chinensis C. Abel, Quercus sclerophylla Lindl. & Paxton)
- Castanopsis scortechinii
- Castanopsis sieboldii (Makino) Hatus. (= Castanopsis cuspidata var. sieboldii (Makino) Nakai, Pasania cuspidata var. sieboldii Makino)
- Castanopsis tessellata Hickel & A. Camus
- Castanopsis tibetana Hance)
- Castanopsis tribuloides (Sm.) A. DC. (= Quercus tribuloides Sm.)
- Castanopsis tungurrut (Blume) A. DC. (= Castanea tungurrut Blume)
- Castanopsis uraiana
- Castanopsis wallichii
- Castanopsis wattii
- Castanopsis xichouensis
Formerly placed here
- 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.
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.
- Gee et al. (2003)
- 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.
- 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
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