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Amentotaxus yunnanensis

Amentotaxus yunnanensis
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Product Information
Specification

Scientific name: Amentotaxus yunnanensis  H.L.Li  1952

Synonyms:Amentotaxus argotaenia var. yunnanensis (H.L.Li) Keng f. 

Common names:Yunnan catkin yew, Southern catkin yew, Yun nan sui hua shan (Chinese), Dẻ tùng vân nam (Vietnamese)

 

Description

Shrub, or small tree to 10(-20) m tall, with trunk to 0.3(-1) m in diameter. Bark grayish brown to reddish brown, weathering light gray. Branches spreading or ascending, forming a broad crown. Leaves (3-)5-10(-15) cm long, (4.5-)7-12(-15) mm wide, glossy dark green to bluish green above, straight to distinctly S-curved, widest near or before the middle to nearly parallel-sided, tapering very gradually to the sharply to bluntly triangular tip and more abruptly to the roundly wedge-shaped base on a very short petiole to 2(-5) mm long. Stomatal bands (1-)2-4(-5) mm wide, white to rusty brown, flanking a green midrib band (0.8-)1.5-2(-2.5) mm wide and flanked by green marginal bands 0.5-1.5(-2) mm wide. Pollen spikes (1-)3-4(-6) in a cluster, each (2.5-)5-10(-15) cm long. Pollen scales of lower cones on spikes with four to eight pollen sacs. Seed stalks 1.5-2.5(-3) cm long. Seeds 2-3 cm long, 1-1.5 cm in diameter, purple to reddish purple.

Discontinuous in southern Taiwan and from southwestern Guizhou (China) south to southern Vietnam. Scattered or gregarious in the understory or canopy of wet or seasonally dry lower montane broad-leaved evergreen or mixed forests or bamboo thickets, especially on slopes, in valleys, or along streamsides, often on limestone-derived  soils; (500-)1,000-1,600(-2,300) m.

 

Conservation Status

Red List Category & Criteria: Vulnerable

(This species has probably undergone a 30-50% population reduction in the past three generations (≥75 years) due to loss of its habitat to expanding agriculture, general logging of forests (bycatch) and direct exploitation of the species. It is therefore listed as Vulnerable. It was previously thought to have undergone a reduction of >50% and hence was listed as Endangered, but that assessment was largely based on the Chinese situation and it is now known to be more widespread in Viet Nam. The bulk of the range and presumably the population occurs outside of China)

 

References

Farjon, A. (2010). A Handbook of the World's Conifers. Koninklijke Brill, Leiden.

Eckenwalder, J.E. (2009) Conifers of the World: The Complete Reference. Timber Press, Portland.

IUCN Red List of Threatened Species, International Union for Conservation of Nature and Natural Resources. Cambridge, UK /Gland, Switzerland

 

Copyright © Aljos Farjon, James E. Eckenwalder, IUCN, Conifers Garden. All rights reserved.

Product CodeAMEGD6YD89


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