Wongan Hills Triggerplant (Stylidium coroniforme) Interim Recovery Plan 2003-2008

Interim recovery plan no. 149
Gillian Stack, Nicole Willers and Andrew Brown
Department of Conservation and Land Management, WA, 2003

4. Term of plan

This Interim Recovery Plan will operate from August 2003 to July 2008 but will remain in force until withdrawn or replaced. If the taxon is ranked higher than Endangered after five years, the need to rewrite this IRP or to replace it with a full RP will be determined.

5. Acknowledgements

The following people have provided assistance and advice in the preparation of this Interim Recovery Plan:

Alanna Chant    Conservation Officer, DCLM's Geraldton District
Anne Cochrane    Manager, DCLM's Threatened Flora Seed Centre
Allen Lowrie    Botanist (Stylidium specialist)
Amanda Shade    Horticulturalist, Botanic Garden and Parks Authority

WE would like to extend our thanks also to the staff of the W.A. Herbarium for providing access to Herbarium databases and specimen information, and to DCLM's Wildlife Branch for assistance.

6. References

Brown, A., Thomson-Dans, C. and Marchant, N. (Eds). (1998) Western Australia's Threatened Flora. Department of Conservation and Land Management, Western Australia.

DCLM (1981) A Guide to the Gazetted rare Flora of Western Australia. Department of Conservation and Land Management, Western Australia.

DCLM (1998) Wildlife Management program No. 26, Declared Rare and Poorly Known Flora in the Geraldton District. Department of Conservation and Land Management, Western Australia.

DCLM (1993) Wildlife Management program No. 9, Declared Rare Flora and other Plants in Need of Special Protection in the Merredin District. Department of Conservation and Land Management, Western Australia.

DCLM (1992) Policy Statement No. 44 Wildlife Management Programs. Department of Conservation and Land Management, Western Australia.

DCLM (1994) Policy Statement No. 50 Setting Priorities for the Conservation of Western Australia's Threatened Flora and Fauna. Department of Conservation and Land Management, Western Australia.

DCLM (1995) Policy Statement No. 29 Translocation of Threatened Flora and Fauna. Department of Conservation and Land Management, Western Australia.

DCLM (1998) Western Australian Herbarium FloraBase - Information on the Western Australian Flora. Department of Conservation and Land Management, Western Australia. http://www.calm.wa.gov.au/science/

Erickson, R. & Willis, J.H. (1966) Some additions to Australian Stylidiaceae. Victorian naturalist 83, 107-112

Richmond, G.S. and Ghisalberti, E.L. (1995) Cultural, food, medicinal uses and potential applications of Myoporum species (Myoporaceae). Economic Botany, 49(3), 276-285.

Stace and Coates (1995) Wongan Hills triggerplant recovery plan. Department of Conservation and Land Management Western

Australia.

World Conservation Union (2000) IUCN red list categories prepared by the IUCN Species Survival Commission, as approved by the 51st meeting of the IUCN Council. Gland, Switzerland.

7. Taxonomic description

Patrick, S.J. (1999) Wildlife Management program No. 26, Declared Rare and Poorly Known Flora in the Geraldton District, 102-103.

Stylidium coroniforme is a perennial plant with a dense, basal cluster of leaf rosettes. The leaves are numerous, grey-green in colour, with conspicuous white margins and a white rib down the underside. They are up to 3 cm long, narrow at the base and widening to c. 5 mm wide towards the apex, ending in a long narrow point. There is one flowering stem arising from each rosette. The flowering stems are 10-15 cm tall, dark-coloured with glandular hairs. Each stem has many short-stalked flowers in a pyramidal raceme up to 12 cm long, each flower with three small bracts at the base. The flowers are c. 1 cm across, yellow at first, becoming creamy white, with four oval petals which are all similar in size, with red spots at the throat and dark red lines on the outer surface. There are two narrow hair-like throat appendages and finger-like projections on the end of the trigger. The ovary is c. 1.5 cm long, the fruit to 2 cm long.

This species is distinctive in its very long ovary, racemose flowering spike and conspicuously margined leaves. Stylidium limbatum has similar leaves but a short ovary. S. dichotomum has a similar flower but the throat in that species has no appendages and the end of the trigger is cushion-like.

Addendum

Wongan Hills Triggerplant (Stylidium coroniforme) Interim Recovery Plan 2003-2008

In adopting this plan under the Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act), the Minister for the Environment and Heritage has approved the following modifications.

Critical Habitat
The plan identifies a broad area as critical habitat, including buffer zones of a set distance around known populations. The Threatened Species Scientific Committee does not necessarily believe that such an area qualifies as habitat critical to the survival of the species, as defined in the EPBC Act.

Recovery Criteria
For the purposes of reviewing this recovery plan under the EPBC Act, the Recovery Criteria are amended to read as follows:

Criteria for success: The number of individuals within populations and/or the number of populations have increased by 10% or more over the period of the plan's adoption under the EPBC Act.
Criteria for failure: The number of individuals within populations and/or the number of populations have decreased by 10% or more over the period of the plan's adoption under the EPBC Act.