Cercidiphyllum

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Cercidiphyllum
Temporal range: Maastrichtian–Recent
Katsura (C. japonicum) trunk and foliage
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Saxifragales
Family: Cercidiphyllaceae
Engl.[1]
Genus: Cercidiphyllum
Siebold & Zucc.
Species

C. japonicum
C. magnificum

The range of Cercidiphyllum.

Cercidiphyllum is a

native to Japan and China and unrelated to Cercis
(redbuds).

Description

The

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.[citation needed
]

The leaves have a strong, sweet smell in the fall, described as caramel or Madeira cake-like. The smell comes from a combination of maltol and a sugary compound in the leaves and is strongest when they are brown.[3] In German, Cercidiphyllum trees are named after their scent; Kuchenbaum or Lebkuchenbaum ("pie tree" or "gingerbread tree").[3][4]

Nomenclature

Katsura (カツラ) is the Japanese name for the tree.[5] 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.[citation needed]

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.
  • 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[6] 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.[7]

Gallery

  • Cercidiphyllum japonicum Trunk bark
    Cercidiphyllum japonicum Trunk bark
  • Cercidiphyllum japonicum leaves
    Cercidiphyllum japonicum leaves
  • "great Katsura of Wachi"
    "great Katsura of Wachi"
  • Cercidiphyllum japonicum in the autumn
    Cercidiphyllum japonicum in the autumn

References

  1. .
  2. ^ 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.
  3. ^
    ISSN 0362-4331
    . Retrieved 2021-10-16.
  4. ^ "Lebkuchenbaum (Cercidiphyllum japonicum) im Porträt - Mein schöner Garten". www.mein-schoener-garten.de (in German). Retrieved 2021-10-16.
  5. ^ "Katsura tree". hosho.ees.hokudai.ac.jp. Retrieved 2021-10-16.
  6. ^ http://apps.rhs.org.uk/plantselector/plant?plantid=371[permanent dead link]
  7. PMID 22845876
    .

Sources

External links