Norfolk Island pine.
Syn: A. excelsa R. Br. ex Aiton, in part (Silba 1986); Dombeya excelsa D.Don; Eutassa heterophylla Salis.
"A conical tree 50-70 m. tall, 1.25-1.75 m. in girth. Bark gray-brown, exfoliating in fine scales. Branches in a flat horizontal plane, sometimes pendent, branchlets in whorls of 4-7. Foliage dimorphic. Juvenile leaves awl-shaped, incurved, green, needle-like, to 1.2 cm. long. Adult leaves scale-like, 4-5 mm. long, incurved, densely arranged, bright dark green; on fertile branchlets overlapping, broadly ovate, spine-tipped, 6 mm. long by 4-6 mm. wide. Male cone in clusters, elongated, 4 cm. long, yellowish-brown or reddish; microsporophylls acute, margins ciliate, denticulate. Female cone broader than long, 12-15 cm. long, with triangular scales and a long incurved bract. Seeds 2.5-3 cm. long by 1.2 cm. wide, with broad wings. Cotyledons 4, epigeal" (Silba 1986).
Endemic to lowland areas of Norfolk Island, a small island (about 10 square kilometers) about 1500 km east of Australia (Silba 1986). You can also create a highly detailed map, and access specimen data, using the "search" function at the Australia Virtual Herbarium. The species is also a popular ornamental in Australia, New Zealand, Hawaii, California, and other places. Hardy to Zone 9 (cold hardiness limit between -6.6°C and -1.1°C) (Bannister and Neuner 2001).
The IUCN reports that this species is facing a high risk of extinction in the wild due to a limited and severely fragmented distribution, coupled with ongoing decline in extent and quality of habitat.
Trees as tall as 57 m with an 350 cm diameter have been recorded in the past. One of the largest remaining trees on Norfolk Island, the Hollow Pine, can be seen in the National Park (Norfolk Island National Park 2007). This trees was measured in 2012 as 269 cm dbh and 43.0 m tall, 170 years old, planted (National Register of Big Trees 2012).
Comparably large trees now occur in mainland Australia, including a 220 cm dbh specimen 140 years old (measured 2011) in Gerringong, NSW; and a tree 43.0 m tall (in 2010) at Raymond Terrace, NSW (National Register of Big Trees 2012).
This is another species for which the largest trees are now ornamental specimens in New Zealand. The Grange Tree in Warkworth, planted in the 1850's, is 34.6 m tall and 317.6 cm dbh with a crown spread of 23.6 m (Robert Van Pelt email, 2009.04.14). A tree 235 cm dbh and 42.7 m tall grows at the Waitangi Treaty Grounds (Robert Van Pelt email, 2003.01.27), and one 51.4 m tall grows in Yatton Park in Tauranga (New Zealand Notable Trees BPR/1068, 2013.01.09). The tallest known tree is at Tedeschi Winery, Ulupalakua, Maui, Hawaii. It is 136 cm dbh and 51.8 m tall (Robert Van Pelt email, 2003.01.27). These trees also do very well in South Africa; a tree at Arderne Gardens, Claremont, Cape Town, is 211 cm dbh and 44.8 m tall (Robert Van Pelt pers. comm., 2003.11.24).
The 170-year-old tree mentioned above is the oldest that I have read of. I would expect that older trees formerly occurred, but it is likely that all trees now living postdate the settlement of Norfolk Island.
"Captain Cook thought the pine would provide 'Masts for the largest Ships' but it was found later to be unsuitable for masts. It proved a useful timber for other purposes however" (Norfolk Island Botanical Gardens home page, accessed 1998, now defunct).
This is the araucaria most widely used as an ornamental.
It is very widely planted in New Zealand, where it was native as recently as the Pleistocene (Graeme Platt, pers. comm. 2003.03.12).
"Young trees have an almost symmetrical form for the first 40 years or so. Female cones are produced on trees older than 15 years and male cones on trees older than 40 years. Prolific seed fall occurs every 4-5 [years] and the seeds are a popular food source for the Green Parrot and introduced rats" (Norfolk Island Botanical Gardens home page, accessed 1998, now defunct).
For pollination mechanisms, see Araucaria.
National Register of Big Trees. 2012. Tree Register: National Registry of Big Trees. www.nationalregisterofbigtrees.com.au, accessed 2012.06.23.
Norfolk Island National Park. 2007. Norfolk Island National Park. http://www.environment.gov.au/parks/norfolk/activities.html, accessed 2007.05.28, now defunct.
Last Modified 2013-03-22