Melaleuca systena

Coastal honeymyrtle
M.systena leaves and flowers
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Myrtales
Family: Myrtaceae
Genus: Melaleuca
Species: M. systena
Binomial name
Melaleuca systena
Craven

Melaleuca systena, commonly known as coastal honeymyrtle is a plant in the myrtle family, Myrtaceae and is endemic to the south-west of Western Australia. It was previously known as Melaleuca acerosa. It is a small shrub with crowded foliage and profuse heads of white to yellow flowers on the ends of its branches in spring.

Description

Melaleuca systena sometimes grows to a height of 2 m (7 ft) but usually much less. Its leaves are arranged alternately, linear to egg-shaped and fleshy, 4–15.5 mm (0.2–0.6 in) long and 0.6–1.4 mm (0.02–0.06 in) wide. They are sometimes glabrous, sometimes covered with fine hairs and often taper to a point.[1]

The flowers are white to creamy-yellow and arranged in heads on the ends of branches which continue to grow after flowering, sometimes also in the upper leaf axils. The heads are up to 20 mm (0.8 in) in diameter and contain 3 to 9 groups of flowers in threes. The flowers appear in winter and summer but are more prolific in spring. The petals are 1.5–2.5 mm (0.06–0.1 in) long and fall off as the flower opens. The stamens are arranged in bundles of five around the flower, usually with 10 to 15 stamens in each bundle. The fruit are woody capsules, roughly urn-shaped, 3–6 mm (0.1–0.2 in) long in small clusters along the stems.[1]

M. systena growing near Jurien Bay
M. systena fruit

Taxonomy and naming

Melaleuca systena was first named in 1999 by Lyndley Craven and Brendan Lepschi in Australian Systematic Botany.[2][3] It has been first formally described in 1824 as Billottia acerosa by Luigi Aloysius Colla.[4] The name was later changed to Melaleuca acerosa but this was an illegal name because it had already been used - Melaleuca acerosa (Colla) G.Don.[5] The name of that species was later changed to Calothamnus quadrifidus.[6] The specific epithet (systena) is from the Ancient Greek systenos meaning "tapering" referring to the shape of the leaf.[1]

Distribution and habitat

This melaleuca occurs on the coast in and between the Shark Bay and Augusta districts[1] in the Avon Wheatbelt, Coolgardie, Geraldton Sandplains, Jarrah Forest, Swan Coastal Plain, Warren and Yalgoo biogeographic regions.[7] It grows in sand over sandstone or laterite and on stable sand dunes.[8]

Conservation

This species is classified as "not threatened" by the Government of Western Australia Department of Parks and Wildlife.[7]

References

  1. 1 2 3 4 Brophy, Joseph J.; Craven, Lyndley A.; Doran, John C. (2013). Melaleucas : their botany, essential oils and uses. Canberra: Australian Centre for International Agricultural Research. p. 353. ISBN 9781922137517.
  2. ↑ Craven, L. A.; Lepschi, B. J. (1999). "Enumeration of the species and infraspecific taxa of Melaleuca (Myrtaceae) occurring in Australia and Tasmania". Australian Systematic Botany. 12 (6): 907–908. doi:10.1071/SB98019.
  3. ↑ "Melaleuca systena". APNI. Retrieved 29 April 2015.
  4. ↑ "Billottia acerosa". APNI. Retrieved 3 September 2015.
  5. ↑ "Melaleuca acerosa". APNI. Retrieved 29 April 2015.
  6. ↑ "Calothamnus quadrifidus". APNI. Retrieved 29 April 2015.
  7. 1 2 "Melaleuca systena". FloraBase. Retrieved 29 April 2015.
  8. ↑ Paczkowska, Grazyna; Chapman, Alex R. (2000). The Western Australian flora : a descriptive catalogue. Perth: Wildflower Society of Western Australia. p. 398. ISBN 0646402439.
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