Cercidiphyllum

Life-forms

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Ordo: Saxifragales

Familia: Cercidiphyllaceae
Genus: Cercidiphyllum

Species: †C. crenatum - C. japonicum - C. magnificum - †C. obtritum

Name

Cercidiphyllum Siebold & Zuccarini, Abh. Math.-Phys. Cl. Königl. Bayer. Akad. Wiss. 4(3): 238 (1846).

Type species: Cercidiphyllum japonicum Siebold & Zucc. ex J.J. Hoffm. & J.H. Schult. bis.

References
Primary references

Engler, H.G.A., 1846. Abhandlungen der Mathematisch-Physikalischen Classe der Königlich Bayerischen Akademie der Wissenschaften 4(3): 238 (1846).

Links

Govaerts, R. et al. 2019. Cercidiphyllum in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2019 October 08. Reference page.
International Plant Names Index. 2019. Cercidiphyllum. Published online. Accessed: October 08 2019.
Tropicos.org 2019. Cercidiphyllum. Missouri Botanical Garden. Published on the internet. Accessed: 2019 October 08.

Vernacular names
English: Katsura
suomi: Katsurat

Cercidiphyllum is a genus containing two species of plants, both commonly called katsura. They are the sole members of the monotypic family Cercidiphyllaceae. The genus is native to Japan and China and unrelated to Cercis (redbuds).

Description

The type species, Cercidiphyllum japonicum, can reach 45 m (148 ft) in height, and is one of the largest hardwoods in Asia. The other species, Cercidiphyllum magnificum, is much smaller, rarely reaching over 10 m (33 ft) in height. Cercidiphyllum produces spurs along its twigs. These are short stems with closely spaced leaves. The foliage is dimorphic. According to a recent description "short shoots bear broadly cordate or reniform, palmately veined leaves with crenate margins; long shoots bear elliptic to broadly ovate leaves with entire or finely serrate margins."[2] Leaf size varies from 3–8 cm long and 3-5.5 cm broad. The genus is dioecious, having separate male and female trees. The small inconspicuous flowers are produced in early spring and wind-pollinated; the fruit is a cluster of 2-4 small pods, each pod 1–2 cm long with numerous small, flattened and winged seeds. The fruits mature in autumn and release their seeds in autumn through winter. The leaves have a strong, sweet aroma in the Fall.
Nomenclature

Katsura is the Japanese name for the tree. The scientific name Cercidiphyllum refers to the close resemblance of the leaves to those of Cercis (redbuds); these two unrelated genera can however be distinguished easily as redbud leaves are alternate, not opposite.
Species

The two species are:

Cercidiphyllum japonicum. Throughout the range of the genus. Typically a multi-stemmed tree to 40–45 m tall in the wild, though typically smaller in cultivation. Bark rough, furrowed. Leaves smaller, not over 4.5 cm long and 3.2 cm broad; stipules falling soon after leafing out in spring. Seed winged only at lower end. Plants from China were at one time separated as C. japonicum var. sinense, but no consistent difference between Japanese and Chinese origins has been found.
Cercidiphyllum magnificum. Endemic to central Honshū, where it grows at higher altitudes than C. japonicum. A small tree, not more than 10 m tall. Bark smooth. Leaves larger, up to 8 cm long and 5.5 cm broad; stipules persistent. Seed winged at both ends.

Cultivation

Katsura is grown as an ornamental tree for its delicate heart-shaped leaves and bright autumn colour, a mix of bright yellow, pink and orange-red. Where conditions are suitable, it is fast-growing, but it is very sensitive to drought and needs deep, permanently moist soil. Under drought conditions, the species will abscise its leaves; however refoliation may occur once water is made available. Of particular interest is the scent produced by the leaves in the autumn, resembling burnt brown sugar or cotton candy. Trees in cultivation, like those in natural environments, tend to sucker from the base when young and become multi-stemmed at maturity; pruning to maintain a single stem is not advised.

Within Cercidiphyllum japonicum, several cultivars with pendulous branches are grown for their unique weeping habit. Two general types exist. Those with a strong central leader, or excurrent growth, are all one clone originating in Morioka City, Japan. This cultivar is known as 'Morioka Weeping' and can reach over 25 m (82 ft) in height. The other type fails to form a central leader and is rounded in habit. There are several clones of this, including 'Amazing Grace' and 'Tidal Wave'.

Both the species C. japonicum[3] and the weeping form C. japonicum f. pendulum have gained the Royal Horticultural Society's Award of Garden Merit.
Uses

Katsura wood is often used to make gobans, i.e. boards for the game Go.
Fossil record

The genus is known from fossils at the end of the Cretaceous (Maastrichtian) of North America, and the Cenozoic of North America, Europe and Asia.[4]
Gallery

Cercidiphyllum japonicum Trunk bark

Cercidiphyllum japonicum leaves

"great Katsura of Wachi"

Cercidiphyllum japonicum in the autumn

References

Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III". Botanical Journal of the Linnean Society. 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x.
Peter K. Endress. 1993. "Cercidiphyllaceae" pages 250-252. In: Klaus Kubitzki (editor). The Families and Genera of Vascular Plants. volume II. Springer-Verlag: Berlin; Heidelberg, Germany.
http://apps.rhs.org.uk/plantselector/plant?plantid=371[permanent dead link]

Qi, Xin‐Shuai; Chen, Chen; Comes, Hans Peter; Sakaguchi, Shota; Liu, Yi‐Hui; Tanaka, Nobuyuki; Sakio, Hitoshi; Qiu, Ying‐Xiong (October 2012). "Molecular data and ecological niche modelling reveal a highly dynamic evolutionary history of the East Asian Tertiary relict Cercidiphyllum (Cercidiphyllaceae)". New Phytologist. 196 (2): 617–630. doi:10.1111/j.1469-8137.2012.04242.x. ISSN 0028-646X. PMID 22845876.

Sources

Andrews, S. (1998). "Tree of the Year: Cercidiphyllum". International Dendrology Society Yearbook. 1997: 17–46.
Dosmann, M. S. (1999). "Katsura: A review of Cercidiphyllum in cultivation and in the wild". The New Plantsman. 6: 52–62.
Dosmann, M. S.; Andrews, S. K.; Del Tredici, P.; Li, J. (2003). "Classification and nomenclature of weeping katsuras". The Plantsman. New Series. 2: 21–27.
Dosmann, M. S.; Iles, J. K.; Graves, W.R. (1999). "Drought avoidance in katsura by drought-induced leaf abscission and rapid refoliation". HortScience. 34 (5): 871–874. doi:10.21273/HORTSCI.34.5.871.

External links
Cercidiphyllum images at the Arnold Arboretum of Harvard University Plant Image Database
Dosman, Michael. "The Katsure Collection." Arnold Arboretum of Harvard University website, Fall 2012. Accessed 1 May 2020.