Melaleuca sclerophylla

Melaleuca sclerophylla is a plant in the myrtle family, Myrtaceae, and is endemic to the south-west of Western Australia. It is distinguished by its unusual leaves which are rough, leathery and covered with small, warty lumps and by its many purple heads of flowers in early spring.

Melaleuca sclerophylla
Melaleuca sclerophylla foliage and flowers in the ANBG

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. sclerophylla
Binomial name
Melaleuca sclerophylla

Description

Melaleuca sclerophylla is sometimes an erect, spreading shrub and others low and ground-covering. It generally grows to a height of about 1.5 m (5 ft) but old specimens are sometimes much taller. New growth is covered with long, soft hairs. The leaves are arranged alternately, mostly glabrous except when young and each is 8–28 mm (0.3–1 in) long and 1.8–6 mm (0.07–0.2 in) wide. They are dark green, leathery, narrow oval to narrow egg-shaped, covered with warty tubercles and have an obvious mid-vein on the lower surface.[2][3]

The flowers are a shade of purple, arranged in heads on the ends of branches which continue to grow after flowering and sometimes in the upper leaf axils. Before opening, the flower buds are covered with dark-coloured bracts which fall off as the flowers open. The heads are up to 20 mm (0.8 in) in diameter and contain 7 to 10 groups of flowers in threes. The stamens are arranged in five bundles around the flowers, each bundle containing between 4 and 7 stamens. Flowering occurs between June and October but mostly in September and is followed by fruit which are woody capsules 2–2.5 mm (0.08–0.1 in) long, in almost spherical clusters along the stems.[2][3]

Melaleuca sclerophylla fruit

Taxonomy and naming

Melaleuca sclerophylla was first formally described in 1904 by Ludwig Diels in Botanische jahrbucher fur systematik, pflanzengeschichte und pflanzengeographie under the heading Fragmenta Phytographiae Australiae occidentalis:Beitrage zur Kenntnis der Pflanzen Westaustraliens, ihrer Verbreitung und ihrer Lebensverhaltnisse ("Contributions to the knowledge of the plants of West Australia, where they are found and their conditions of existence").[1][4] The specific epithet (sclerophylla) is from the Ancient Greek words skleros meaning “hard” or "tough"[5]:396 and phyllon meaning “leaf”[5]:605 referring to the toughness of the leaves.[2]

Distribution and habitat

Melaleuca sclerophylla occurs in the Kalbarri and Wongan Hills districts in the Avon Wheatbelt, Geraldton Sandplains and Jarrah Forest biogeographic regions[6] growing in sand with clay or gravel on granite outcrops.[7]

Conservation

This species is classified 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 and is not currently in imminent danger.[8]

Use in horticulture

This species has been successfully grown in the southern parts of Australia in sunny positions in well-drained soils in winter-wet areas. It has also proved to be frost hardy.[3]

References
  1. "Melaleuca sclerophylla". APNI. Retrieved 20 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. 319. ISBN 9781922137517.
  3. Holliday, Ivan (2004). Melaleucas : a field and garden guide (2nd ed.). Frenchs Forest, N.S.W.: Reed New Holland Publishers. pp. 254–255. ISBN 1876334983.
  4. Diels, Ludwig; Pritzel, Ernst Georg (1905). Botanische jahrbucher fur systematik, pflanzengeschichte und pflanzengeographie. Leipzig. pp. 428–429. Retrieved 20 April 2015.
  5. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press.
  6. "Melaleuca sclerophylla". FloraBase. Western Australian Government Department of Parks and Wildlife.
  7. Paczkowska, Grazyna; Chapman, Alex R. (2000). The Western Australian flora : a descriptive catalogue. Perth: Wildflower Society of Western Australia. p. 397. ISBN 0646402439.
  8. "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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