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Physical Description

Type Information

Type collection for Taxus globosa Schltr.
Catalog Number: US 1205344
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): C. Ehrenberg
Year Collected: 1837
Locality: Real del Mote, Huajolate., Mexico, Central America
  • Type collection: Schlechter, F. R. R. 1838. Linnaea. 12: 496.
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Source: National Museum of Natural History Collections

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Taxus globosa is almost always found in the low and middle tree layers of montane forest, oak forest, and pine-oak forest and is considered as a indicator species for cloud forest. It shows a strong preference for moist and shaded ravines.

Systems
  • Terrestrial
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Taxus globosa

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


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© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage: Taxus globosa

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 3
Specimens with Barcodes: 9
Species With Barcodes: 1
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Source: Barcode of Life Data Systems (BOLD)

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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
EN
Endangered

Red List Criteria
A2c

Version
3.1

Year Assessed
2013

Assessor/s
Thomas, P.

Reviewer/s
Luna Vega, I. & Farjon, A.

Contributor/s

Justification
The extent of occurrence is well in excess of 20,000 km2. The area of occupancy (AOO) is unknown but is likely to be less than 2,000 km2; while it is known from many localities it is never common and does not form large stands. Past and current exploitation and deforestation of montane cloud forests is likely to have led to a reduction in the total population size; this is likely to continue. Recent research on the Mexican subpopulations that represent the major proportion of the global population, indicate that as much as 80% of its potential habitat has been lost since 1970 (Contreras-Medina et al. 2010). Montane cloud forests have also been heavily exploited in other parts of its range. An overall reduction of at least 50% within the last three generations is probably a conservative estimate. Consequently an assessment of Endangered under the A2 criterion is warranted.

History
  • 1997
    Rare
    (Walter and Gillett 1998)
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Population

Population
Throughout its range, populations are usually small and disjunct. In El Salvador there are as few as six trees in a single location (F. Tobar pers. comm. March 2012).

Population Trend
Decreasing
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Threats

Major Threats
Some interest has been shown by pharmaceutical companies in its medicinal properties. There is no evidence of active exploitation for that purpose. The principal threat to this species is the ongoing over-exploitation of the montane cloud forests throughout Mexico and Central America.
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Management

Conservation Actions

Conservation Actions
In Guatemala it has been assessed as nationally VU under the B2 criterion (Vivero 2006). In Mexico it has been assessed as Endangered under the A criterion (Espinosa et al. 2011). Although it is known from several protected areas that span most of its range, the vast majority of known localities are outside of such areas (Contreras-Medina et al. 2011). It is necessary to develop management plans to recover and conserve this species both within and outside protected areas.
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Wikipedia

Taxus globosa

Taxus globosa or Mexican yew is an evergreen shrub and one of the eight species of yew. The Mexican yew is a rare species, only known to be found in a small number of locations in eastern Mexico, Guatemala, El Salvador and Honduras,[1] and is listed as an endangered species. The Mexican yew is a shrub that grows to an average height of 4.6m. It has large, sharp light green needles growing in ranks on either side of its branches.

There are several projects in order to produce Paclitaxel (an anti-tumor agent) around the world, but Mexican yew has not been as well studied because its low production of Taxol (Bringi et al., 1995) [2] by in vitro plant cell cultures. Few researchers focus their work on this species, the team leader on Taxus globosa S. is perhaps that of Barradas[3] at Veracruz Institute of Technology (Instituto Tecnológico de Veracruz).

Notes[edit]

  1. ^ Taxus globosa, Schlectendahl, 1838, found here retrieved on March 10, 2007
  2. ^ Bringi V, Prakash G. K., Prince C. L., Schubmehl B. F., Kane E. J., Roach B.. 1995. “Enhanced production of taxol and taxanes by cell cultures of taxus species”. Patent number (USA): 5407816, Assigned to: Phyton Catalytic Inc.
  3. ^ Barradas, D. D. Ma., Hayward, J. P. M., Mata, R. M., Palmeros, S. B., Platas, B. O. B. J., Velázquez, T. R. F.. (2010). Taxus globosa S. cell lines: Initiation, selection and characterization in terms of growth, and of baccatin III and paclitaxel production. Biocell, 34 (1), 1-6.
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