Species Profile and Threats Database

For information to assist proponents in referral, environmental assessments and compliance issues, refer to the Policy Statements and Guidelines (where available), the Conservation Advice (where available) or the Listing Advice (where available).
In addition, proponents and land managers should refer to the Recovery Plan (where available) or the Conservation Advice (where available) for recovery, mitigation and conservation information.

EPBC Act Listing Status Listed as Extinct
Adopted/Made Recovery Plans
Federal Register of
    Legislative Instruments
Declaration under s178, s181, and s183 of the Environment Protection and Biodiversity Conservation Act 1999 - List of threatened species, List of threatened ecological communities and List of threatening processes (Commonwealth of Australia, 2000) [Legislative Instrument].
State Government
    Documents and Websites
NSW:Hypsela sessiliflora- endangered species determination. Department of Environment and Conservation (New South Wales). (New South Wales Scientific Committee, 2003) [State Action Plan].
NSW:Hypsela sessiliflora - profile (NSW Department of Environment, Climate Change and Water (NSW DECCW), 2005gf) [Internet].
State Listing Status
NSW: Listed as Endangered (Threatened Species Conservation Act 1995 (New South Wales): August 2014 list)
Scientific name Hypsela sessiliflora [9693]
Family Campanulaceae:Campanulales:Magnoliopsida:Magnoliophyta:Plantae
Species author E.Wimm.
Infraspecies author  
Reference Wimmer, F.E. in Engler, H.G.A. (1943), Das Pflanzenreich Heft 106: 121, fig. 31b.
Distribution map Species Distribution Map not available for this taxon.
Illustrations Google Images

The current conservation status of Hypsela sessiliflora under Australian and State Government legislation is as follows:

National: Listed as Extinct under the Environment Protection and Biodiversity Conservation Act 1999.

New South Wales: Listed as Endangered under the Threatened Species Conservation Act 1995.

Field surveys carried out in 1999 by ecological consultants recorded Hypsela sessiliflora on the Austral Tile Company site, near Penrith. At that time, the species was listed as "presumed extinct" under the NSW Threatened Species Conservation Act 1995.

In October 2002 the New South Wales Scientific Committee, established by the Threatened Species Conservation Act, made a determination for the provisional listing, on an emergency basis, of Hypsela sessiliflora as an endangered species under that Act.

Scientific name: Hypsela sessiliflora

A prostrate herb with 2–3 cm branches and 2–4 mm ovate to oblong leaves. The leaf surface is smooth with an entire (smooth) or scalloped edge. Most leaves have a leaf-stalk. Solitary, more or less sessile flowers are white or pale purple occurring in the spring, but also when conditions are suitable at other times of the year. The smooth petals are 4–5 mm long and form a funnel-shaped tube. The tiny sepals (0.5 mm long) are covered in minute hairs. The fruits are indehiscent (not splitting open at maturity) and generally fleshy (NSW DECCW 2005gf; Wiecek 1992).

Currently known from only two adjacent sites (less than 10x15 m) on a single private property at Erskine Park in the Penrith Local Government Area. Previous sightings are all from western Sydney, at Homebush and at Agnes Banks (New South Wales Scientific Committee 2003; NSW DECCW 2005gf).

There is no population data available for Hypsela sessiliflora.

Hypsela sessiliflora is known to grow in damp places, including freshwater wetland, grassland/alluvial woodland and an alluvial woodland/shale plains woodland (Cumberland Plain Woodland) ecotone (NSW DECCW 2005gf; Wiecek 1992).

Hypsela sessiliflora is early successional (fast growing, opportunistic) species that benefits from some disturbance (NSW DECCW 2005gf; Wiecek 1992), however, the species may be out competed when overgrown by some species such as Cyndon dactylon (NSW DECCW 2005gf).

Hypsela sessiliflora mainly flowers in spring, although it has been occasionally recorded flowering at other times of the year (Wiecek 1992).

Threats to Hypsela sessiliflora include loss of habitat, changes to hydrology and grazing. Further, the species is also threatened by demographic and environmental stochasticity due to its small population and localised extent (New South Wales Scientific Committee 2003).

The Department of Environment, Climate Change and Water (2005gf) outlines the following recovery needs:

  • Off-site conservation to prevent extinction due to loss of only known population
  • Control pedestrian access
  • Protection of existing habitat
  • Translocation to other sites to reduce stochastic threats

The following table lists known and perceived threats to this species. Threats are based on the International Union for Conservation of Nature and Natural Resources (IUCN) threat classification version 1.1.

Threat Class Threatening Species References
Uncategorised:Uncategorised:threats not specified Hypsela sessiliflora in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage, 2006nw) [Internet].

New South Wales Scientific Committee (2003). Hypsela sessiliflora- endangered species determination. Department of Environment and Conservation (New South Wales). [Online]. Available from: [Accessed: 01-May-2007].

NSW Department of Environment, Climate Change and Water (NSW DECCW) (2005gf). Hypsela sessiliflora - profile. [Online]. Available from:

Wiecek, B. (1992). Harden, G.J., ed. Flora of New South Wales. 3:131. Sydney, NSW: University of New South Wales Press.

EPBC Act email updates can be received via the Communities for Communities newsletter and the EPBC Act newsletter.

This database is designed to provide statutory, biological and ecological information on species and ecological communities, migratory species, marine species, and species and species products subject to international trade and commercial use protected under the Environment Protection and Biodiversity Conservation Act 1999 (the EPBC Act). It has been compiled from a range of sources including listing advice, recovery plans, published literature and individual experts. While reasonable efforts have been made to ensure the accuracy of the information, no guarantee is given, nor responsibility taken, by the Commonwealth for its accuracy, currency or completeness. The Commonwealth does not accept any responsibility for any loss or damage that may be occasioned directly or indirectly through the use of, or reliance on, the information contained in this database. The information contained in this database does not necessarily represent the views of the Commonwealth. This database is not intended to be a complete source of information on the matters it deals with. Individuals and organisations should consider all the available information, including that available from other sources, in deciding whether there is a need to make a referral or apply for a permit or exemption under the EPBC Act.

Citation: Department of the Environment (2014). Hypsela sessiliflora in Species Profile and Threats Database, Department of the Environment, Canberra. Available from: Accessed Fri, 3 Oct 2014 03:03:32 +1000.