Conifers Garden - Online Tree Nursery

Athrotaxis x laxifolia

Athrotaxis x laxifolia
  • Click to enlarge
  • Click to enlarge

€0.00

This product is currently out of stock


Product Information
Specification

Scientific name:  Athrotaxis x laxifolia Hooker  1843

Common names: Summit cedar, Tasmanian pencil pine

 

Description

A hybrid between pencil pine (Athrotaxis cupressoides) and King Billy pine (Athrotaxis selagionides).

Trees to 10-15 m tall; monopodial, erect, in old trees up to 0.5 m diameter. Bark on old trees furrowed,  exfoliating in thin flakes and long, shredding strips, light brown. Branches thick, ascending or spreading, forming a conical, dense crown, in old trees irregular and open. Leaves helically arranged in ranks of 5, 4-12 × 2-3 mm (larger on leading, older branchlets), decurrent, imbricate, the distal part spreading slightly, lanceolate, widest at the point of curvature, keeled; margins entire; apex incurved, obtuse, usually lustrous light green; leaves amphistomatic, with few stomata proximally on the abaxial face and two bands of widely spaced stomata adaxially, sometimes epistomatic. Pollen cones terminal or subterminal, at base surrounded by shortened leaves 3-5 mm long, up to 4 mm wide, yellowish, turning brown. Seed cones terminal on branchlets with non-modified leaves, solitary; mature cones globose or subglobose, 15-26 × 14-20 mm, with 14-18 helically arranged bract-scale complexes which part widely at maturity. Seed 30-40 per cone, obovate-oblong, ca. 2 mm long, with 2 narrow wings of slightly unequal size and shape and 0.5-1 mm wide positioned more or less in one plane.

Central and southern Tasmania. Growing with its parents; 900-1,200 m.

 

Conservation Status

Red List Category & Criteria: Endangered

(In 2000, this (notho)species was assessed as Vulnerable under criterion D1 with the global population estimated to be less than 1,000 mature individuals. No decline was indicated in that assessment. The area of occupancy (AOO), estimated using herbarium collection data and a grid of 2 km, is 40 km² which could be an underestimate as there are more localities not sampled for institutional herbaria ((Brown and Hill in Farjon and Page (1999). However, with the few trees present in each locality the 2 km grid (IUCN recommended standard) is likely to be too generous. The AOO is by all estimates much less than 500 km², the population is severely fragmented and when this species declines with its congeners, as it is reasonable to assume, it meets the B criterion for listing as Endangered)

 

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 CodeATHMYIJ719
Propagation0.0000


This field is required.
Top