Melaleuca dempta

Melaleuca dempta is a plant in the myrtle family, Myrtaceae and is endemic to the south-west of Western Australia. It is an erect shrub resembling Melaleuca calycina with its heads of white flowers and egg-shaped to heart-shaped leaves. It was formerly considered a subspecies of Melaleuca calycina subsp. dempta but it lacks the star-like fruits of that species and its leaves have a blunt rather than a pointed tip.

Melaleuca dempta
M. dempta leaves, flowers and fruit

Priority Three — Poorly Known Taxa (DEC)
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Myrtales
Family: Myrtaceae
Genus: Melaleuca
Species:
M. dempta
Binomial name
Melaleuca dempta
Synonyms[1]

Melaleuca calycina subsp. dempta Barlow

Description

Melaleuca dempta is a shrub often growing to about 2.2 m (7 ft) high with the branches glabrous except when very young. Its leaves are arranged in alternating pairs at right angles to the leaves above and below so that the leaves are in four rows along the stems. The leaves are 4.2–8 mm (0.2–0.3 in) long, 2.5–6.2 mm (0.1–0.2 in) wide, broadly elliptic, egg-shaped or heart-shaped with the end tapering to a rounded point.[1][2]

The flowers are white and arranged in heads on the ends of branches which continue to grow after flowering. The heads are up to 18 mm (0.7 in) in diameter with up to 4 individual flowers. The petals are 2.6–2.9 mm (0.10–0.11 in) long and fall off as the flower ages. There are five bundles of stamens around the flower, each with 22 to 29 stamens. Flowering occurs mainly in September but may continue to February and is followed by fruit which are woody capsules 4.6–6.2 mm (0.18–0.24 in) long with five blunt teeth persisting around the edge. (These teeth are long in Melaleuca calycina giving its fruit a star shape when viewed end-on.)[1][2]

M. dempta at the type location near Scaddan

Taxonomy and naming

This species was first formally described in 1988 as Melaleuca calycina subsp. dempta Barlow by B.A.Barow and K.J. Cowley.[3] It was raised to species status in 1999 by Lyndley Craven.[4][5] The specific epithet (dempta) is from the Latin demptus, meaning "to take away or remove", referring to the lack of long, curved teeth around the fruit.[1]

Distribution and habitat

Melaleuca dempta occurs in and between the Scaddan, Gibson and Dalyup River districts[1][2] in the Esperance Plains and Mallee biogeographic regions.[6] It grows in dense scrub in sandy soil in swampy areas and on the edges of clay pans.[1][2]

Conservation status

Melaleuca dempta is listed as "Priority Three" by the Government of Western Australia Department of Parks and Wildlife[6] meaning that it is known from only a few locations but is not currently in imminent danger.[7]

References
  1. 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. 143. ISBN 9781922137517.
  2. Holliday, Ivan (2004). Melaleucas : a field and garden guide (2nd ed.). Frenchs Forest, N.S.W.: Reed New Holland Publishers. p. 44. ISBN 1876334983.
  3. "Melaleuca calycina subsp. dempta". APNI. Retrieved 2 September 2015.
  4. "Melaleuca dempta". APNI. Retrieved 3 May 2015.
  5. 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): 872. doi:10.1071/SB98019.
  6. "Melaleuca dempta". FloraBase. Western Australian Government Department of Parks and Wildlife.
  7. "Conservation codes for Western Australian Flora and Fauna" (PDF). Government of Western Australia Department of Parks and Wildlife. Retrieved 31 March 2020.
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