Callitris columellaris

Taxobox
name = "Callitris columellaris"
status = LR/lc
status_system = IUCN2.3

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image_width = 240px
image_caption = "Callitris columellaris" ("C. glaucophylla")
regnum = Plantae
divisio = Pinophyta
classis = Pinopsida
ordo = Pinales
familia = Cupressaceae
subfamilia = Callitroideae
genus = "Callitris"
species = "C. columellaris"
binomial = "Callitris columellaris"
binomial_authority = F.Muell.

"Callitris columellaris" is a species of coniferous tree in the family Cupressaceae (cypress family), native to most of Australia. Common names include White Cypress-pine, Murray River Cypress-pine, and Northern Cypress-pine.

It is a small evergreen tree, 4–12 m (rarely to 20 m) high, with a trunk up to 50 cm diameter. The leaves are scale-like, 2-6 mm long and 0.5 mm broad, arranged in decussate whorls of three on very slender shoots 0.7-1 mm diameter. The cones are globose, 1-2 cm diameter, with six triangular scales, which open at maturity to release the seeds.

Some authors (e.g. Thompson & Johnson 1986, followed by the "Flora of Australia Online") divide it into three species (or occasionally as varieties), based largely on the foliage colour, with green plants predominating on the east coast of Australia, and glaucous plants in the interior, and on cone size, with on average marginally smaller cones in tropical areas (north of 22°S). However, others (e.g. Blake 1959, Farjon 2005) point out that both the foliage colour and cone size is very variable, even from tree to tree in local populations, and maintain that it is impossible to distinguish three taxa within the species. When split into three species, the following names apply:
*"Callitris columellaris" F.Muell. "sensu stricto" – coastal northeast New South Wales, southeast Queensland.
*"Callitris glaucophylla" Joy Thomps. & L.A.S.Johnson (syn. "C. columellaris" var. "campestris" Silba; "C. glauca" nom. inval.; "C. hugelii" nom. inval.) – throughout most of the southern half of Australia.
*"Callitris intratropica" R.T.Baker & H.G.Smith (syn. "C. columellaris" var. "intratropica" Silba) – northern Queensland, northern Northern Territory, northern Western Australia.

References and external links

* Blake, S. T. (1959). New or noteworthy plants, chiefly from Queensland. "Proc. Roy. Soc. Queensland" 70 (6): 33-46.
* Farjon, A. (2005). "Monograph of Cupressaceae and Sciadopitys", pp. 507-513. Royal Botanic Gardens, Kew. ISBN 1-84246-068-4.
* Thompson, J. & Johnson, L. A. S. (1986). "Callitris glaucophylla, Australia's 'White Cypress Pine' – a new name for an old species. "Telopea" 2 (6): 731-736.
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* [http://www.conifers.org/cu/call/columellaris.htm Gymnosperm Database - "Callitris columellaris"]
* [http://www.conifers.org/cu/call/glaucophylla.htm Gymnosperm Database - "Callitris glaucophylla"]
* [http://www.conifers.org/cu/call/intratropica.htm Gymnosperm Database - "Callitris intratropica"]