Calothamnus borealis

Calothamnus borealis is a plant in the myrtle family, Myrtaceae and is endemic to the south-west of Western Australia. It is a small, erect shrub with crowded, cylindrical leaves and red flowers. It grows in sand surrounded by spinifex or heath. In 2014 Craven, Edwards and Cowley proposed that the species be renamed Melaleuca aquilonia.[1][2]

Calothamnus borealis
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Myrtales
Family: Myrtaceae
Genus: Calothamnus
Species:
C. borealis
Binomial name
Calothamnus borealis
Hawkeswood
Synonyms

Melaleuca aquilonia Craven & R.D.Edwards

Description

Calothamnus borealis is a low, spreading shrub with many stems, growing to a height of about 1.0 metre (3 ft) and with new growth covered with soft hairs. Its leaves are crowded, mostly 7–10 millimetres (0.3–0.4 in) long and 1.0–1.5 millimetres (0.04–0.06 in) wide, cylindrical in shape, tapering to a non-prickly point. They are covered with short hairs giving a greyish tinge.[3][4]

The flowers are red and are arranged in small clusters containing 1 to 12 individual flowers, mostly hidden among the leaves. The petals are about 5 millimetres (0.2 in) long, pinkish to brownish in colour with a papery texture. The stamens are arranged in 5 claw-like bundles with 20 to 25 stamens per bundle. Flowering occurs from July to September and is followed by fruits which are woody, almost cylindrical capsules, 6.5–10 millimetres (0.3–0.4 in) long and 7–10 millimetres (0.3–0.4 in) in diameter.[3]

Taxonomy and naming

Calothamnus borealis was first formally described in 1984 by Trevor Hawkeswood from a specimen found near Exmouth.[3][5] The specific epithet (borealis) is derived from the Latin, meaning "north" or "northern" and refers to the fact that this species has the most northerly distribution of any of the Calothamnus species.[3]

Distribution and habitat

Calothamnus borealis occurs from the Exmouth area south to Coral Bay, with a disjunct population in the Kennedy Range. Its range is within the Carnarvon biogeographic region.[6] It grows in sand dunes in heath or spinifex grassland.[3][7]

Conservation

This species is classified as "not threatened" by the Western Australian government department of parks and wildlife.[6]

References
  1. "Melaleuca aquilonia". APNI. Retrieved 25 July 2015.
  2. Craven, Lyn A.; Edwards, Robert D.; Cowley, Kirsten J. (30 June 2014). "New combinations and names in Melaleuca (Myrtaceae)". Taxon. 63 (3): 663–670. doi:10.12705/633.38.
  3. Hawkeswood, Trevor J. (1984). "Nine new species of Calothamnus Labill. (Myrtaceae: Leptospermoideae) from Western Australia" (PDF). Nuytsia. 5 (1): 150–151. Retrieved 25 July 2015.
  4. "Advice to the Minister for Sustainability, Environment, Water, Population & Communities from the Threatened Species Scientific Committee" (PDF). Australian Government Department of the Environment. Retrieved 6 June 2015.
  5. "Calothamnus borealis". APNI. Retrieved 25 July 2015.
  6. "Calothamnus borealis". FloraBase. Retrieved 25 July 2015.
  7. Paczkowska, Grazyna; Chapman, Alex R. (2000). The Western Australian flora : a descriptive catalogue. Perth: Wildflower Society of Western Australia. p. 350. ISBN 978-0646402437.
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