Indicative distribution
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: Grevillea evansiana
Profile last updated:
01 Aug 2024
Description
A dense spreading shrub, rarely more than 0.5 m high, but can grow to 1.5 m, with white hairy stems. The leaves elliptic to obovate (occasionally linear) and are grey-green, entire, to 40 mm x 8 mm, glossy green above, silver-grey underneath with a small pointed tip. Flowers are dark red (and rarely white) and occur in round clusters. Flowers occur in August to December. The fruit is a hairless and smooth follicle.
Distribution
Restricted to mostly within Wollemi National Park principally around the Dunns Swamp area in the central west, but also in outlying locations around Glen Davis and northern section of Newnes Plateau.
Habitat and ecology
- Grows in a range of habitats including pagoda heath, dry sclerophyll forest or woodland and hanging swamps in sandy soils, usually over Hawkesbury sandstone.
- Flowers August to December, with peak flowering in September.
- Likely to be a fire sensitive obligate seeder with recruitment occurring from a soil stored seed bank following fire. Seedling recruitment can also occur in the absence of fire, but is promoted by physical disturbance or canopy gaps.
Regional distribution and habitat
Click on a region below to view detailed distribution, habitat and vegetation information.
Threats
- Habitat degradation and plant damage due to disturbance associated primarily with camping, as well as orienteering and other off-track recreational activities in Ganguddy-Dunns swamp area, especially in Pagodas, including potential for foot-traffic spread of soil-borne diseases
- Too frequent fires, especially in years following wildfires and before plants mature. Frequent cool-season fires could be catastrophic if seedlings and immature plants comprising a substantial part of population are burned and seedbank is exhausted. To a lesser extent, fire suppression (too infrequent fire) could lead to recruitment limitation and species habitat degradation due to changes in vegetation community with increased plant density and resource competition. Repeated short-interval, autumn winter fires from hazard reduction burning is a threat at sites that are located at the public-private land interface.
- Risk of catastrophic events and inbreeding depression affecting the entire population due to small population size and geographic isolation.
- Domestic and feral goats grazing, trampling and degrading habitat on the northwest spur of Mt Towinhingy.
- Investigate presence / susceptibility / effects of the disease Phytophthora on the species.
- Lack of knowledge on whether the population is divided into two ecotypes associated with two habitat types occurring within its small distribution. Unknown whether this has a genotypic basis or reflects a physiological adaptation to different habitats.
- Damage and trampling from vehicles associated with fire/access trail management, and the maintenance of powerline easement
Recovery strategies
Priority actions are the specific, practical things that must be done to recover a threatened species, population or ecological
community. The Office of Environment and Heritage has identified
13 priority actions
to help recover the Evans Grevillea in New South Wales.
Activities to assist this species
- Ensure that personnel planning and undertaking hazard reduction burns are able to identify the species and are aware of its habitat.
- Ensure appropriate fire regimes. In particular avoid fire at intervals of less than seven years.
- Introduce measures to prevent habitat degradation related to unrestricted access to habitat.
Information sources
- Benson, D. and McDougall, L. (2000) Ecology of Sydney plant species. Part 7b: Dicotyledon family Proteaceae to Rubiaceae. Cunninghamia 6(4).
- NSW National Parks and Wildlife Service (2000) Grevillea evansiana. Threatened species profile. NPWS, Sydney.
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