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cultivated seedling

Natural populations

This species occurs on south eastern parts of the Great Dividing Range, mainly at altitudes of 500-1700 m [1]. Its most northern occurrences are in the Goulburn River valley region north of Rylestone in New South Wales, from where it extends south to near Healesville in Victoria. A western outlier occurs in the Grampians, western Victoria. Acacia obliquinervia is a tree up to 15 m tall. It often grows on relatively steep mountain hillsides on soils drived from a ranges of substrates including sandstone, granite and metasediments [1,2].

Flowering and seeds

Flowering in this species usually occurs during late winter and spring [2]. Pods mature during summer and there are about 13 viable seeds per gram [3]. Nicking or boiling the seeds in water for a minute at 100°C is required to induce germination. Seeds start to germinate in about 20 days if grown at 25°C [3].

Cultivation and uses

Acacia obliquinervia is a tall, nitrogen-fixing tree, adapted to steep sites on mountain ranges in cool temperate climates. While there are limited records for this species in cultivation, there is some evidence that it is moderately fast growing on adverse sites and it may have an important role to play in the catchment management of steep sites that are subject to erosion. The gum produced by this species is an important food source for aboreal marsupials. Reputed to be hardy, sensitive to overwatering and frost hardy to -7°C [4]. The gum produced by this species is a food source for the endangered Leadbeaters Possum (Gymnobelideus leadbeateri) [5].

Key descriptors:
Climate parameters
Mean annual rainfall: 750-2000 mm
Rainfall distribution pattern: uniform or winter
Mean annual temperature: 6-15 °C
Mean max. temperature of the hottest month: 15-28 °C
Mean min. temperature of the coldest month: -4-2 °C
Frosts per year: up to 20 or greater than 20
Frost intensity: light to moderate (0 to -5°C) or heavy (greater than -5°C)
Altitude: 500-2000 metres
Tolerance of climate extremes
Fire: killed by damaging fire does not regenerate foliage
Frost: tolerates frosts in the 0° to -5°C range or tolerates heavy frosts colder than -5°C
Soil factors
Texture: clay loam, heavy clay (greater than 50% clay), light to medium clay (35-50% clay) or loam, sandy loam, sandy clay loam
Soil pH reaction: acidic (less than 6.5) or neutral (6.5-7.5)
Soil depth: skeletal to shallow (less than 30 cm) or moderate to deep (30-100 cm or greater)
Drainage: well-drained
Salinity: non-saline
Tolerance of adverse soils
Extremes in pH: acidity
Extremes in texture: clayey
Salinity: nil - sensitive to saline soils
Soil waterlogging tolerance: nil - sensitive to waterlogged soils
Biological traits under cultivation
Habit: evergreen tree 5-10 m tall, tree 10-20 m tall, usually produces a clear trunk
Longevity: moderate to long lived (>15 years)
Growth rate: moderate
Root system: shallow and spreading or fixes nitrogen via root symbiot
Erosion control potential: excellent for clayey sites
Wood density: mod. to high (greater than 600 kg/cubic metre)
Carbon sequestration potential: moderate
Uses
Potential farm use: shelterbelt or shade for stock
Specialty products: pollen has value for apiculture, gums, resins
Urban use: good as an ornamental or amenity plant
Wood products: craftwood (for turnery etc.), high quality fuelwood, industrial charcoal, light construction, panelling, speciality timber for quality furniture
Potentially undesirable attributes
Fire sensitivity: killed by severe fires (seeder)
Growth habit: shallow roots may outcompete adjacent plants
Weediness: high potential based on its biology

References

[1] Maslin BR (2001) Acacia obliquineria. Flora of Australia, 11A: 252.

[2] Tame T (1992) Acacias of New South Wales. Kangaroo Press, Sydney.

[3] Gunn BV (2001) Australian Tree Seed Centre Operations Manual. Internal Publication, CSIRO Australian Tree Seed Centre, ACT. [Online at http://www.ensisjv.com/Portals/0/atsc-opmanualcomplete.pdf  Accessed March 2008]

[4] Wrigley and Fagg (1996) Australian Native Plants. 3rd Edn. Harper Collins, Sydney.

[5] Department of Environment Recovery Plan report online at: http://environment.gov.au/biodiversity/threatened/publications/recovery/leadbeaters-possum/index.html

Internet links

PlantNET National Herbarium of New South Wales: http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Acacia~obliquinervia

Grimwade Plant Collection, University of Melbourne: http://www.botany.unimelb.edu.au/buffalo/Acacia_obliquinervia.htm

World Wide Wattle: http://www.worldwidewattle.com/speciesgallery/obliquinervia.php

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