Calothamnus quadrifidus subsp. asper

Calothamnus quadrifidus subsp. asper is a plant in the myrtle family, Myrtaceae and is endemic to the south-west of Western Australia. It is similar to other subspecies of Calothamnus quadrifidus except that its leaves are short, flat and obviously rough and scaly when mature.

Calothamnus quadrifidus subsp. asper
Calothamnus quadrifidus asper leaves and flowers
Conservation status
Priority Two — Poorly Known Taxa (DEC)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Myrtales
Family:	Myrtaceae
Genus:	Calothamnus
Species:	C. quadrifidus
Subspecies:	C. q. subsp. asper
Trinomial name
Calothamnus quadrifidus subsp. asper (Turcz.) A.S.George & N.Gibson
Synonyms
Melaleuca quadrifida subsp. aspera (Turcz.) Craven & R.D.Edwards

Description

Calothamnus quadrifidus subsp. asper is an erect shrub which sometimes grows to a height of 4 metres (10 ft) and lacks a lignotuber. Its leaves are flat, linear to narrow egg-shaped with the narrow end towards the base, 10–23 millimetres (0.4–0.9 in) long and 1–2 millimetres (0.04–0.08 in) wide. The leaves are also rough and scaly, with scattered hairs.[1]

The flowers are a deep red colour and are arranged in clusters, usually on one side of the stem amongst the older leaves. The stamens are arranged in 4 claw-like bundles, each about 23–28 millimetres (0.9–1 in) long. Flowering occurs from August to September and is followed by fruits which are woody, barrel-shaped capsules, 10–14 millimetres (0.4–0.6 in) long.[1]

Calothamnus quadrifidus asper growing near Wongan Hills

Taxonomy and naming

Calothamnus quadrifidus subsp. asper was first formally described in 2010 by Alex George in Nuytsia.[2] It had originally been described in 1849 by Nikolai Turczaninow as Calothamnus asper.[1][3] The word (asper) is a Latin word meaning "rough", "harsh" or "uneven".[4]

Distribution and habitat

Calothamnus quadrifidus subsp. asper is found in the Wongan Hills district[1] of the Avon Wheatbelt biogeographic region.[5]

Conservation

Calothamnus quadrifidus subsp. asper is classified as "Priority Two" by the Western Australian Government Department of Parks and Wildlife[5] meaning that it is poorly known and from fewer than five locations.[6]

References

1. George, Alex S.; Gibson, Neil (2010). "A revision of Calothamnus quadrifidus (Myrtaceae)" (PDF). Nuytsia. 20: 70–72. Retrieved 1 August 2015.
2. "Calothamnus quadrifidus subsp. asper". APNI. Retrieved 2 August 2015.
3. "Calothamnus asper". APNI. Retrieved 2 August 2015.
4. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 669.
5. "Calothamnus quadrifidus subsp. asper". FloraBase. Retrieved 2 August 2015.
6. "Conservation codes for Western Australian Flora and Fauna" (PDF). Government of Western Australia Department of Parks and Wildlife. Retrieved 16 July 2019.