Boronia capitata

Boronia capitata, commonly known as the cluster boronia,[2] is a plant in the citrus family, Rutaceae and is endemic to the south-west of Western Australia. It is a slender, spreading shrub with simple leaves and pink, four-petalled flowers.

habit

Cluster boronia
Boronia capitata near Quairading
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Sapindales
Family: Rutaceae
Genus: Boronia
Species:
B. capitata
Binomial name
Boronia capitata
Occurrence data from Australasian Virtual Herbarium

Description

Boronia capitata is a slender, spreading shrub that grows to a height of 15–130 cm (6–50 in). It has simple, thick, linear to club-shaped leaves 4–15 mm (0.2–0.6 in) long. The flowers are pink and are arranged in clusters on the ends of the branches, each on a pedicel 1–3 mm (0.04–0.1 in) long. The four sepals are broadly elliptic to narrow triangular, and the four petals are broadly elliptic, about 6 mm (0.2 in) long.[2][3][4][5]

Taxonomy and naming

Boronia capitata was first formally described in 1863 by George Bentham and the description was published in Flora Australiensis from a specimen collected by James Drummond.[4][6] The specific epithet (capitata) is a Latin word meaning "having a head".[7]

In 1971, Paul G. Wilson described three subspecies:[8]

  • Boronia capitata subsp. capitata has leaves and sepals that are glabrous or fringed with hairs and flowers from September to October;[9]
  • Boronia capitata subsp. clavata has thick leaves covered with long, soft hairs, and broadly elliptic sepals fringed with hairs and flowers from April to October;[10]
  • Boronia capitata subsp. gracilis slender leaves covered with long, soft hairs and narrow egg-shaped sepals with a hairy fringe and flowers from June to November.[11]

Distribution and habitat

Conservation

Subspecies clavata is classified as "not threatened"[13] but subspecies gracilis is classified as "Priority Three" by the Government of Western Australia Department of Parks and Wildlife[14] meaning that it is poorly known and known from only a few locations but is not under imminent threat.[15] Subspecies capitata is listed as "endangered" under the Australian Government Environment Protection and Biodiversity Conservation Act 1999[16] and as "Threatened Flora (Declared Rare Flora — Extant)" by the Department of Environment and Conservation (Western Australia).[12] The main threats to this subspecies are clearing and fragmentation of its habitat.[16]

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References
  1. "Boronia capitata". Australian Plant Census. Retrieved 4 March 2019.
  2. "Boronia capitata". FloraBase. Western Australian Government Department of Parks and Wildlife.
  3. Duretto, Marco F.; Wilson, Paul G.; Ladiges, Pauline Y. "Boronia capitata". Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 5 March 2019.
  4. Bentham, George; von Mueller, Ferdinand (1863). Flora Australiensis (Volume 1). London: Lovell Reeve and Co. p. 323. Retrieved 4 March 2019.
  5. Corrick, Margaret G.; Fuhrer, Bruce A. (2009). Wildflowers of southern Western Australia (3rd ed.). Dural, N.S.W.: Rosenberg Publishing. p. 190. ISBN 9781877058844.
  6. "Boronia capitata". APNI. Retrieved 4 March 2019.
  7. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 399.
  8. Wilson, Paul G. (1971). "Taxonomic notes on the family Rutaceae, principally of Western Australia". Nuytsia. 1 (2): 202–203. Retrieved 5 March 2019.
  9. Duretto, Marco F.; Wilson, Paul G.; Ladiges, Pauline Y. "Boronia capitata subsp. capitata". Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 5 March 2019.
  10. Duretto, Marco F.; Wilson, Paul G.; Ladiges, Pauline Y. "Boronia capitata subsp. clavata". Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 5 March 2019.
  11. Duretto, Marco F.; Wilson, Paul G.; Ladiges, Pauline Y. "Boronia capitata subsp. gracilis". Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 5 March 2019.
  12. "Boronia capitata subsp. capitata". FloraBase. Western Australian Government Department of Parks and Wildlife.
  13. "Boronia capitata subsp. clavata". FloraBase. Western Australian Government Department of Parks and Wildlife.
  14. "Boronia capitata subsp. gracilis". FloraBase. Western Australian Government Department of Parks and Wildlife.
  15. "Conservation codes for Western Australian Flora and Fauna" (PDF). Government of Western Australia Department of Parks and Wildlife. Retrieved 5 March 2019.
  16. "Approved Conservation Advice for Boronia capitata subsp. capitata" (PDF). Australian Government Department of the Environment. Retrieved 20 March 2019.
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