Persoonia muelleri

Persoonia muelleri
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
Order:	Proteales
Family:	Proteaceae
Genus:	Persoonia
Species:	P. muelleri
Binomial name
Persoonia muelleri Persoonia muelleri (P.Parm.) Orchard

Persoonia muelleri, commonly known as Mueller’s geebung, is a shrub endemic to Tasmania.^[1] It forms a shrub in open areas of wet forests in the west and northeast of the state. It is occasionally confused with P. gunnii though it has larger flowers and longer, straighter leaves.

Description

Persoonia muelleri grows as a shrub or small tree generally from 1 to 4 m (3 ¹⁄₄ to 13 ¹⁄₈ ft) tall, though sometimes plants reach 5 m (16 ³⁄₈ ft) high. Bark on larger branches and trunk is dark brown and flaky.^[2] It has narrow leaves measuring 1.3 to 6 cm (¹⁄₂ to 2 ³⁄₈ in) long and 0.3–1 cm (¹⁄₈–³⁄₈ in) wide. New growth is covered in fine grey to tawny hair. The small flowers are yellow to cream.^[1] Var. muelleri flowers from December to February and var. densifolia from January to March.^[2]

Taxonomy

The French botanist Paul Évariste Parmentier described this species as Drimys muelleri, placing it in the family Winteraceae, in 1896.^[3] Ferdinand von Mueller had sent him leaves and stems without any flowering parts, from which Parmentier had concluded it lay within the genus Drimys, though was not like any existing species. The specimen lay unnoticed until Jim Willis concluded it was Persoonia gunnii.^[2] It was given its current name and reclassified in the genus Persoonia by botanist Tony Orchard in 1984.^[4] The genus was reviewed by Peter Weston for the Flora of Australia treatment in 1995, and the three endemic Tasmanian species P. muelleri, P. gunnii and P. moscalii are classified in the gunnii group.^[5]

There are 3 known subspecies of P. muelleri, which have been also relegated to the rank of variety.^[1] Subspecies muelleri has hairless oblanceolate leaves and grows in the northeast of the state. Subspecies augustifolia grows in the west of the state on nutrient poor soils and has narrow, hairy linear to oblanceolate leaves. Subspecies densifolia grows along the south coast and offshore islands and has hairy leaves which are broader than the other subspecies.^[1][6]

Populations with characteristics intermediate between P. muelleri and P. gunnii are known from Lake Dove–Cradle Mountain and Adamsons Peak–South Cape localities.^[1]

Distribution and habitat

P. muelleri var. muelleri is found on the central plateau, including Mount Field, and northeastern highlands of the state. It grows in open forest dominated by Eucalyptus or Nothofagus cunninghamii, often in damp areas and south-facing slopes with mossy ground cover.^[2]

P. muelleri var. densifolia is found on along the south coast and Bathurst Harbour, as well as on subalpine heathland on Mount Council. It is a component of littoral rainforest and scrub.^[7]

Ecology

Persoonia muelleri subsp. densifolia is known to be susceptible to Phytophthora cinnamomi dieback.^[8]

References

1. "Persoonia muelleri (P.Parm.) Orchard". Flora of Australia Online. Department of the Environment and Heritage, Australian Government.
2. Orchard, Anthony E. (1983). "The Tasmanian species of Persoonia Smith (Proteaceae)". Brunonia 6 (2): 217–40. doi:10.1071/BRU9830217.
3. "Drimys muelleri P.Parm.". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government.
4. "Persoonia muelleri (P.Parm.) Orchard". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government.
5. Weston, Peter H. (1995). "Persoonioideae". In McCarthy, Patrick (ed.). Flora of Australia: Volume 16: Eleagnaceae, Proteaceae 1. Collingwood, Victoria: CSIRO Publishing / Australian Biological Resources Study. pp. 47–125. ISBN 0-643-05693-9.
6. Jordan, Greg (2011). "Persoonia muelleri". Key to Tasmanian Dicots. University of Tasmania. Retrieved 17 September 2012.
7. Rudman, T.; Horton, B.M.; Balmer, J. (2008). "Monitoring Dry Coastal Vegetation in the Tasmanian Wilderness World Heritage Area, Part 1 Monitoring Priorities, Nature Conservation Report 2008 / 1" (PDF). Hobart, Tasmania: Department of Primary Industries and Water.
8. Schahinger, R., Rudman T., and Wardlaw, T. J. (2003). "Conservation of Tasmanian Plant Species & Communities threatened by Phytophthora cinnamomi. Strategic Regional Plan for Tasmania" (PDF). Hobart, Tasmania: Department of Primary Industries, Water and Environment. pp. (appendix). Retrieved 17 September 2012.