Araucaria cunninghamii

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Related Links
A. cunnighamii, 13 year old species trial plot, CATIE, Turrialba, Costa Rica.
© David Boshier
Juvenile foliage from stump shoots on mature trees at Gympie, Queensland, Australia
© Anthony Simons
Araucaria cunninghamii seedling
© David Boshier

Local names:
English (Richmond river pine,moreton Bay pine,hoop pine,colonial pine), German (kolonialkiefer,Cunninghams Schmucktanne), Indonesian (pien,ningwik,alloa), Portuguese (yau), Thai (son naam)

Araucaria cunninghamii is a large, unbuttressed, symmetrical tree, 50-70 m high; bole straight, cylindrical, self-pruning, clean to 30 m or more; mature trees 1.2-1.7 m in diameter; trunk internodes variable, 1-4 m; crown pyramidal to flat; branches in whorls of up to 6, more or less horizontal, with 2nd- to 5th-order branchlets; outer bark dark plum, red-brown or grey, rough, peeling off around circumference in stringy papery layers; middle bark reddish-brown; inner bark mottled white.

Juvenile leaves 23-27 x 20-25 mm, longer and flatter than adult, persist until trees are 10 years old; adult foliage crowded in overlapping whorls on ends of branches, persistent, without petioles, narrow to broadly triangular, slightly curved, 8-10 mm long, glabrous, dull green.

Monoecious; male strobili usually borne on lower and mid-crown branches, terminal, green, yellow at anthesis, red-brown later, elongated, about 90 x 10 mm.

Cone green, ovoid, 70-100 x 60-80 mm, covered with short spines, 9-10 mm long, deflexed; seed in the form of ovulate cone scales, more or less flat, woody, triangular, with 2 thin wings, indehiscent scale terminating in a sharp spine; reddish-brown.

The name ‘araucaria’ is derived from Arauco, a province of southern Chile.

Ecology

A. cunninghamii occurs in isolated remnant pockets or in fairly dense stands on ridges. In some instances it is found on swampy terrain, often associated with A. hunsteinii, Castanopsis, Flindersia, Lithocarpus and Toona spp. It mainly occurs as scattered, predominant trees over an understorey of rainforest; only rarely does it form pure forests.

Native range
Australia, Indonesia, Papua New Guinea

Tree management

Rigorous weeding is necessary until the canopy closes, as Araucaria species suffer from grass competition, grow only slowly and often turn chlorotic. It is a self-pruning species. In Australia, the 1st thinning is done at 17 years, leaving 865 stems/ha, followed by the 2nd thinning at 22 years, the 3rd thinning at 27 years, and the final thinning at 50 years, leaving 198 stems/ha. The trees are normally clear felled at 60 years of age.

Seed storage behaviour is orthodox. Mature seeds collected at about 36% mc tolerate desiccation to about 7 % mc or even 2% mc without loss in viability. A germination rate of 43% has occurred after 8 years of hermetic air-dry storage at -15 deg. C. The viability of seeds that have been dried to moisture contents in equilibrium with ambient environment was maintained for 8 years at -9 deg. C to -15 deg. C. Similarly, 50% germination after 50 weeks of air-dry storage at -12 deg. C has been reported. If mature seeds are dried to 5% mc, long-term storage is possible in sealed containers at 3 deg. C. or lower. There are approximately 2400-4000 seeds/kg.

A. cunninghamii occurs in isolated remnant pockets or in fairly dense stands on ridges. In some instances it is found on swampy terrain, often associated with A. hunsteinii, Castanopsis, Flindersia, Lithocarpus and Toona spp. It mainly occurs as scattered, predominant trees over an understorey of rainforest; only rarely does it form pure forests.

Seedlings can be raised by pregermination techniques or by sowing into beds. A. cunninghamii can also be successfully grafted by using scion budding with material taken from the apical leader of the main stem, or by side-approach grafting and bottle grafting using the apical shoot of the main stem. Grafted branch material produces plagiotropic grafts and has little use other than for pollen production.

A. cunnighamii is potentially capable of being an important plantation enrichment planting species  in Africa and tropical America.

Fibre:  A. cunninghamii is directly or indirectly suitable for pulping through the use of wood residues.

Timber:  A. cunninghamii produces a medium-quality softwood for use as general-purpose construction timber; better grades are suitable for internal finishes for buildings, furniture and cabinet making. It is also an excellent veneer species and is used as such.

Ornamental: The tree is cultivated for ornamental purposes.