Overview

Distribution

Range Description

Found in Japan and China.
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Localities documented in Tropicos sources

Cercidiphyllum japonicum Siebold & Zucc.:
Japan (Asia)
China (Asia)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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S and W Anhui, S Gansu, NE Guizhou, SW Henan, Hubei, NW Hunan, N Jiangxi, S Shaanxi, SW Shanxi, Sichuan, NE Yunnan, NW Zhejiang [Japan].
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National Distribution

United States

Origin: Exotic

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Physical Description

Morphology

Description

Trees, 10--20 m tall. Branchlets glabrous. Leaves dimorphic; leaf blade glabrous or abaxially hairy in axils of basal veins; veins ca. 5--7, abaxially slightly prominent. Long shoot leaves: petiole 1.5--2 cm; leaf blade 3.2--4.5 × 1.9--3.2 cm, ovate, elliptic, or obovate, base rounded, truncate, or slightly cuneate, margin entire or finely serrate, apex acute. Short shoot leaves: petiole 1.4--4.7 cm; leaf blade 3.7--9 × 5--8.3 cm, ovate to reniform, base cordate, margin crenate, apex rounded. Staminate flowers: stamens ca. 9 mm; filaments filiform; anthers pink, 3--4 mm, narrowly oblong, longitudinally dehiscent, apex short apiculate. Pistillate flowers: carpel 1--1.5 cm; stigma red, decurrent, 2-ridged. Follicle brown to black, oblong, 10--18 × 2--3 mm, with a short persistent style. Seeds brown, flat, trapezoidal, 4--5 mm, winged; wing at the proximal end, 3--4 mm. Fl. Apr, fr. Aug. 2n = 38.
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Diagnostic Description

Synonym

Cercidiphyllum japonicum var. sinense Rehder & E. H. Wilson.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Temperate beech forests in Japan and in remnant patches of broad-leaved forest in China.

Systems
  • Terrestrial
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Forests, forest margins, by streams; 600--2700 m.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Cercidiphyllum japonicum

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Statistics of barcoding coverage: Cercidiphyllum japonicum

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 3
Specimens with Barcodes: 22
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LR/nt
Lower Risk/near threatened

Red List Criteria

Version
2.3

Year Assessed
1998
  • Needs updating

Assessor/s
World Conservation Monitoring Centre

Reviewer/s

Contributor/s
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National NatureServe Conservation Status

United States

Rounded National Status Rank: NNA - Not Applicable

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NatureServe Conservation Status

Rounded Global Status Rank: GNR - Not Yet Ranked

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Population

Population
A rare tree.
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Threats

Major Threats
The main threat to the species is poor regeneration.
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Wikipedia

Cercidiphyllum japonicum

Cercidiphyllum japonicum, known as the Katsura (from its Japanese name カツラ, 桂), is a species of flowering tree in the family Cercidiphyllaceae native to China and Japan. The tree is deciduous and grows to 10–45 metres tall, with a trunk diameter of up to 2 metres (rarely more).[1][2][3]

Closeup of leaves, showing seasonal coloration

The shoots are dimorphic, with long shoots forming the structure of the branches, and bearing short shoots from their second year onward. The leaves are produced in opposite pairs on long shoots, and singly on short shoots; they have a 1.4–4.7 cm petiole, and are rounded with a heart-shaped base and a crenate margin. Leaves on short shoots are larger, 3.7–9 cm long and 5–8.3 cm broad, and those on long shoots smaller, 3.2–4.5 cm long and 1.9–3.2 cm broad. The leaves turn a variety of pinks and yellows in autumn, and sometimes have a distinctive caramel scent when in fresh autumn colours. The flowers are inconspicuous, produced in early spring among the opening leaves, with male and female flowers on separate plants (dioecious). The fruit is a cluster of two to four follicles 1–1.8 cm long and 2–3 mm wide, each follicle containing several winged seeds.[1][2]

Branch with fruit

The species is listed as Endangered in China, but overall (including Japanese populations), is classified as being Lower Risk.[3] The Chinese populations were sometimes distinguished in the past as Cercidiphyllum japonicum var. sinense Rehder & E.H.Wilson, but this is now generally regarded as not distinct from the type.[1][2] Several different cultivars are grown, including 'Aureum', 'Heronswood Globe', and 'Ruby'.

References

  1. ^ a b c Andrews, S. (1998, 1999). Tree of the Year: Cercidiphyllum japonicum. International Dendrology Society Yearbook 1997: 17-45; 1998: 33-38.
  2. ^ a b c Flora of China: Cercidiphyllum japonicum
  3. ^ a b Chen, C., Liu, Y-H., Fu, C-X., & Qiu, Y-X. (2010). New microsatellite markers for the rare plant Cercidiphyllum japonicum and their utility for Cercidiphyllum magnificum. Amer. J. Bot. 97 (9): e82–e84 full text.
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