Taxus calcicola L.M. Gao & Mich. Möller

Taxaceae

This species has recently been described from southwest China and northern Vietnam. Since then it has also been recorded from Lao PDR under the name T. wallichiana. While it is not yet included on the IUCN Redlist, it is likely to be assessed as Endangered or Vulnerable under Criterion A and possibly C.

Distribution

In China this species has been recorded from southeast Yunnan, northeast and southwest Guizhou. In Vietnam it has been recorded from Lao Cai, Son La, Hoa Binh and Hagiang (Moeller et al 2013). Previously, Taxus from these parts of northern Vietnam had been identified as T. chinensis. Very recently it has been collected from a single locality in Vientiane Province in Lao PDR (Averyanov et al 2015). Its distribution is incompletely known.

Habitat and Ecology

Restricted to karst limestone mountains at altitudes between 800 and 1525 metres above sea-level. Associated taxa may include Clausena excavata Burm. f., Cleidion bracteosum Gagnep., Eurya groffii Merr., Litsea cubeba (Lour.) Pers., Pavieasia anamensis Pierre, Sinosideroxylon pedunculatum (Hemsl.) H. Chuang, Xantolis boniana (Dubard) P. Royen, Yunnanopilia longistaminea (W.Z. Li) C.Y. Wu & D.Z. Li, Amentotaxus yunnanensis H.L. Li, Cephalotaxus mannii Hook. f., Podocarpus neriifolius D. Don, and Podocarpus wangii C.C. Chang

Human Uses

Selectively felled for its timber and, to some extent, exploited for Taxol production

Conservation Status

Proposed Global Status and Rationale

Vulnerable (Endangered?) A2cd

As with other Taxus species in Asia, it has been exploited for Taxol production and has suffered from deforestation and the conversion of its habitat for agriculture. Large trees have also been selectively felled for their rot resistant timber. Throughout its known range, its subpopulations are small and fragmented.

Conservation Actions

A few trees are within protected areas in northern Vietnam. Further research is need to establish its full distribution.