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Species profile—Trigonostemon inopinatus


Plantae (plants) → Equisetopsida (land plants) → EuphorbiaceaeTrigonostemon inopinatus

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Species details

Plantae (plants)
Equisetopsida (land plants)
Scientific name
Trigonostemon inopinatus Airy Shaw
WildNet taxon ID
Nature Conservation Act 1992 (NCA) status
Conservation significant
Pest status
Short Notes
BRI 198399 (Holotype), 198400 (Isotype), handwriting of author
Trigonostemon inopinatus is a small tree growing from 3 to 6 m high, the young growth having a dense covering of short, brown hairs, becoming hairless with age. The leaves are oval-shaped, widest at or above the centre, 4 to 9 cm long and 2 to 4 cm wide, sparsely hairy on both surfaces, mostly obtuse at the apex, the margin entire or with wave-like undulations or rounded teeth towards the apex. This species has separate male and female flowers on the same plant. Male flowers are on stalks 5 to 6 mm long, with five or six narrow, tapering sepals 3 to 5 mm long and five petals 4 mm long, cream with a red base or entirely blackish-red. Stamens 3, on a thick staminal column. The female inflorescence is unknown, apparently 1-flowered. The fruit are dry, approximately spherical, 13 mm wide, smooth, subtended by leaf-like sepals 6 to 11 mm long (Airy Shaw, 1976; Airy Shaw, 1980).
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Trigonostemon inopinatus is known from a small area between Mackay and Proserpine in Queensland. The Queensland Herbarium has six specimens collected between 1965 and 2004. The species is located within Eungella National park, and Macartney State Forest (Queensland Herbarium, 2012).
Distributional limits
-20.8034409, 148.4844241
-21.1523257, 148.6703841
Range derivation
Range derived from extent of the taxon's verified records
Trigonostemon inopinatus occurs in Araucarian microphyll and notophyll vineforest on alluvium along rocky creek banks; complex notophyll vineforest on a granite ridge crest; and mixed notophyll vineforest on granite derived soils, at altitudes of 80 to 820 m (Queensland Herbarium, 2012).
Flowering and fruiting has been recorded from December to July (Queensland Herbarium, 2012).
Threatening processes
Research is needed to identify potential threats to Trigonostemon inopinatus (DSEWPC, 2012).
Status notes
Listed as Vulnerable under the Nature Conservation Act 1992. Trigonostemon inopinatus has been recorded from Cathu State Forest 652; Cawley State Forest; Eungella National Park (the Mount Beatrice area at a tributary of Catherine Creek); and Douglas Creek. The extent of occurrence of this species is unknown. It was recorded by collectors as very common in Cathu State Forest in 2004 and locally common near Catherine Creek and near Wagoora in 1993. (Queensland Herbarium 2012).
Management recommendations
Regional and local priority actions to support the recovery of Trigonostemon inopinatus are outlined by DSEWPC (2012). A summary of these include: avoid habitat loss, disturbance and modification (e.g. monitor known populations to identify key threats; monitor the progress of recovery, including the effectiveness of management actions and the need to adapt them if necessary); increase conservation information (raise awareness of Trigonostemon inopinatus in the local community); and enable recovery of additional sites and/or populations (e.g. undertake appropriate seed collection and storage; investigate options for linking, enhancing or establishing additional populations).
Occurs in the following Queensland pastoral district: South Kennedy. The species was previously listed under the EPBC Act as vulnerable.
Airy Shaw, H.K. (1976). New or noteworthy Euphorbiaceae. Kew Bulletin 31 (2): 396.
Airy Shaw, H.K. (1980). A partial synopsis of the Euphorbiaceae - Platylobeae of Australia (excluding Phyllanthus, Euphorbia and Calycopeplus). Kew Bulletin 35 (3): 691.
Department of Sustainability, Environment, Water, Population and Communities (DSEWPC) (2012). Trigonostemon inopinatus in Species Profile and Threats Database, Department of Sustainability, Environment, Water, Population and Communities, Canberra. Accessed 28/06/2012.
Queensland Herbarium (2012). Specimen label information. Queensland Herbarium. Accessed 20/03/2012.
Profile author
Ronald Booth (05/06/2012)

Other resources

The Australasian Virtual Herbarium (AVH)
Atlas of Living Australia

Data source

This profile data is sourced from the QLD Wildlife Data API using the Get species by ID function used under CC-By 4.0

This information is sourced from the WildNet database managed by the Queensland Department of Environment and Science.

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Creative Commons Attribution 4.0 International (CC BY 4.0)
Last updated
8 March 2022
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