Melaleuca protrusa

Melaleuca protrusa is a shrub in the myrtle family, Myrtaceae, and is endemic to the south-west of Western Australia. It is a shrub with papery bark, narrow leaves with a hooked end and cream-coloured or yellow flowers. Although it was described as late as 2010, it is not considered a rare or endangered species. It resembles other members of the brushwood group such as M. uncinata, M. atroviridis and M. zeteticorum.

habit near Wongan Hills

Melaleuca protrusa
Melaleuca protrusa foliage, flowers and fruit
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Myrtales
Family: Myrtaceae
Genus: Melaleuca
Species:
M. protrusa
Binomial name
Melaleuca protrusa
Craven & Barlow[1]

Description

Melaleuca protrusa is a shrub growing to a height of 4 m (10 ft) with papery bark at the base of the main stem and glabrous branchlets. The leaves are arranged alternately, 40–90 mm (2–4 in) long, 0.9–1.5 mm (0.04–0.06 in) wide, linear in shape, elliptic in cross section and with a short, bent hook on the end.[2][3]

The flowers are cream to yellow and are arranged in heads at the ends of branches which continue to grow after flowering and sometimes on the sides of branches. The heads are 7–11 mm (0.3–0.4 in) in diameter and contain 10 to 16 groups of flowers in threes. The petals are 0.8–1.8 mm (0.03–0.07 in) long and fall off soon after the flower opens. The stamens are arranged in five bundles around the flowers and each bundle contains 3 to 5 stamens. Flowering occurs in spring and is followed by fruit which are 2–3 mm (0.08–0.1 in) long in roughly spherical clusters around the stem with each fruit protruding somewhat from the cluster.[2][3]

Taxonomy and naming

Melaleuca protrusa was first described in 2010 by Lyndley Craven, Brendan Lepschi and Kirsten Cowley.[1] The specific epithet (protrusa) is derived from the Latin protrudo meaning to "push forward" or "thrust out"[4] referring to the way the individual fruits protrude from the clusters.[2]

Distribution and habitat

Melaleuca protrusa occurs in and between the districts of Mullewa, Dalwallinu, Sandstone and Southern Cross[2] in the Avon Wheatbelt, Coolgardie and Murchison biogeographic regions[5] where it grows in mallee thicket in sandy or clay loam over granite.[3]

Conservation

This melaleuca is classified as "not threatened" by the Government of Western Australia Department of Parks and Wildlife.[5]

Uses

This species contains the monoterpenoid essential oil, 1,8-cineole (Eucalyptol). Owing to its similarities to M. uncinata, it may be suitable for brushwood production.[2]

References
  1. "Melaleuca protrusa". APNI. Retrieved 18 April 2015.
  2. 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. 394. ISBN 9781922137517.
  3. Craven, Lyndley; Lepschi, Brendan; Cowley, Kirsten (2010). "Melaleuca (Myrtaceae) of Western Australia: five new species, three new combinations, one new name and a new state record" (PDF). Nuytsia. 20: 31–32. Retrieved 18 April 2015.
  4. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 634.
  5. "Melaleuca zonalis Craven". FloraBase. Western Australian Government Department of Parks and Wildlife.
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