Overview

Distribution

Range Description

This species is found in China: S Gansu, N & W Sichuan.
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S Gansu, N and W Sichuan
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Physical Description

Morphology

Description

Trees to 30 m tall; trunk to 1 m d.b.h.; branchlets densely arranged, not glaucous, terete, ultimate ones spreading, ascending, or drooping but not pendulous, stout, 1.2-2 mm in diam. Leaves in 4 ranks, scalelike, 1-1.5 mm on ultimate branchlets, arched (gibbous) and with a conspicuous, often darker central abaxial gland, apex usually slightly obtuse, dull green, not glaucous. Pollen cones 2-4 mm; microsporophylls 12-16. Seed cones brown or reddish brown when ripe, not glaucous, globose to subglobose or oblong-ovoid, 1.2-2 cm in diam.; cone scales 8-14, each fertile scale with numerous seeds; bracts with a small, free mucro at apex. Seeds ovate-triangular, flattened, 3-5 × 2-4 mm. 2n = 22*.
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Type Information

Isotype for Cupressus chengiana S.Y. Hu
Catalog Number: US 1626869
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): W. C. Cheng
Year Collected: 1930
Locality: Tachieniu., Szechwan, China, Asia-Temperate
Elevation (m): 2400 to 2400
  • Isotype: Hu, S. Y. 1964. Taiwania. 10: 57.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
In small, pure stands in some valleys, but more commonly on rocky slopes or cliffs associated with Koelreuteria paniculata, Morus mongolica, Campylotropis delavayi, Bauhinia faberi, Cotoneaster multiflorus, and C. gracilis; in non-acidic brown soils over granites, quartzites and limestones. Based on verified herbarium collections, the altitudinal range is extensive, ranging from ca. 1200 m to 2750 m a.s.l. The climate is characterized by cold winters and cool to warm summers, with a distinct alternation of dry and rainy seasons; annual precipitation varies between 500-750(-1000 mm), with a 50-70% moisture deficit. There is no recorded difference in ecology for the two varieties.

Systems
  • Terrestrial
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* Mountain slopes, valleys; 800-2900 m.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Cupressus chengiana

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


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Statistics of barcoding coverage: Cupressus chengiana

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

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
B2ab(v)

Version
3.1

Year Assessed
2013

Assessor/s
Zhang, D & Christian, T.

Reviewer/s
Thomas, P. & Farjon, A.

Contributor/s

Justification
The species level assessment for Cupressus chengiana is determined by the assessment for the typical variety as it is this taxon that occupies the major part of the species' distribution and population, with the other variety jiangeensis being only known for certain from a single tree. With an area of occupancy of 700 km2, fewer than 10 locations, and a continuing decline in the number of mature individuals, the species is consequently assessed as Vulnerable.

History
  • 2000
    Vulnerable
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Population

Population
The total population is declining due to past and recent exploitation for timber.

Population Trend
Decreasing
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Threats

Major Threats
This species is known from ca. 9 different locations where natural populations are now mostly restricted to more inaccessible sites such as canyons and exposed cliffs. Overcutting is the main cause of its decline. A collection from Hunan Province is most likely to be from an introduced tree.
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Management

Conservation Actions

Conservation Actions
This species is planted in villages within its natural range in Sichuan and possibly in Gansu as well.
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Wikipedia

Cupressus chengiana

Cupressus chengiana is a species of conifer in the Cupressaceae family. It is found only in China.

Sources[edit]

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Notes

Comments

A vulnerable species.
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