Nature conservation

Threatened species

Severn River Heath-myrtle - profile

Indicative distribution

   Loading map...
The areas shown in pink and/purple are the sub-regions where the species or community is known or predicted to occur. They may not occur thoughout the sub-region but may be restricted to certain areas. ( click here to see geographic restrictions). The information presented in this map is only indicative and may contain errors and omissions.
Scientific name: Micromyrtus grandis
Conservation status in NSW: Endangered
Commonwealth status: Endangered
Gazetted date: 06 Jun 1997
Profile last updated: 21 Nov 2018


Severn River Heath-myrtle is an upright shrub 1 -4 m tall, with paired leaves. Its leaves are smooth or finely toothed, 0.5 - 4 mm long and 0.5 - 1.5 mm wide, with obvious oil dots (visible when the leaf is held up against the light). The tiny cream to pink flowers appear during July-September, growing in the upper part of the branches. Severn River Heath-myrtle is distinguished by its overall size which is the largest yet known in the genus and by the 5-ribbed fruit, stalked flowers and broader leaves compared to other species in its range.


Restricted to Severn River Nature Reserve and an adjacent property, about 60km north-west of Glen Innes on the New England Tablelands.

Habitat and ecology

  • Flowers from July to September; fruiting time is August to September.
  • Severn River Heath-myrtle grows in heath and low woodland in crevices of acid volcanic rocky outcrops and in the shallow soil of surrounding areas, at altitudes of 600 to 750 m. It occurs in open and exposed sites.
  • Associated species within low woodland include Eucalyptus crebra, Allocasuarina inophloia, Acacia sp. aff. pubifolia, Xanthorrhoea johnsonii; in heath the association comprises Leptospermum novae-angliae, Micromyrtus sessilis and Leucopogon neo-anglicus.
  • Pollination is probably via insects and seed dispersal via fruit.
  • Some seedling recruitment and germination is often observed after fire, however adult plants of many Micromyrtus species are killed by high intensity fire. Very few juveniles of Micromyrtus grandis were present in the population, possibly due to the age of the communities as fire had not occurred in the area for some time.
  • An extended population of Micromyrtus grandis is found on a single long ridge, where the species dominates or co-dominates communities. The population is estimated as more than 1500 plants and covers an area of at least 4 hectares in total.

Regional distribution and habitat

Click on a region below to view detailed distribution, habitat and vegetation information.


Recovery strategies

Activities to assist this species

Information sources

IBRA Bioregion IBRA Subregion Known or predicted Geographic restrictions region
New England TablelandsGlenn Innes-Guyra Basalts Predicted None
New England TablelandsSevern River Volcanics Known None