Araucaria columnaris, the coral reef araucaria, Cook pine (orCook's pine), New Caledonia pine, Cook araucaria, or columnar araucaria, is a species of conifer in the family Araucariaceae.
| Araucaria columnaris | |
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Gymnospermae |
| Division: | Pinophyta |
| Class: | Pinopsida |
| Order: | Araucariales |
| Family: | Araucariaceae |
| Genus: | Araucaria |
| Section: | A. sect. Eutacta |
| Species: |
A. columnaris
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| Binomial name | |
| Araucaria columnaris | |
| Synonyms[2] | |
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The tree is endemictoNew Caledonia in the Melanesia region of the Pacific.
It was first classified by Johann Reinhold Forster, a botanist on the second voyage of Captain James Cook to circumnavigate the globe as far south as possible. It is named directly for Cook, and not for the Cook Islands.
Araucaria columnaris is a distinctive narrowly conical tree growing up to 60 m (200 ft) tall in its native habit. The trees have a slender, spire-like crown.[3] The shape of young trees strongly resembles A. heterophylla. The bark of the Cook pine peels off in thin paper-like sheets or strips and is rough, grey, and resinous.[3]
The relatively short, mostly horizontal branches are in whorls around the slender, upright to slightly leaning trunk. The branches are lined with cord-like, horizontal branchlets. The branchlets are covered with small, green, incurved, point-tipped, spirally arranged, overlapping leaves. The young leaves are needle-like, while the broader adult leaves are triangular and scale-like.[3]
The female seed cones are scaly, egg-shaped, and 10–15 cm (4–6 in) long by 7–11 cm (3–4 in) wide. The smaller, more numerous male pollen cones are at the tips of the branchlets and are scaly, foxtail-shaped, and 5 cm (2 inches) long.[3]
A 2017 study found that trees tend to have a tilt dependent on the hemisphere of their location, growing upright on the Equator but leaning south in the northern hemisphere and north in the southern hemisphere.[4]
It is cultivated in gardens and public landscapes in Queensland and Victoria of Australia, northern New Zealand, Southern California, Puerto Rico, Mexico, India, Philippines, Hawaii, South Brazil, Singapore, and Southeast Brazil.[3] Many of the "Norfolk Island pines" that grow in Hawaii, including their descendants used as potted ornamentals on the U.S. mainland, are actually A. columnaris, the two species having been confused when introduced.[5]
