Cyanothamnus tenuis

Cyanothamnus tenuis, commonly known as blue boronia,[2] is a species of plant in the citrus family, Rutaceae, and is endemic to the southwest of Western Australia. It is a slender shrub with thread-like, sessile leaves, and flowers with four petals that are white to pink on the front and pale blue on the back.

Cyanothamnus tenuis

Priority Four — Rare Taxa (DEC)
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Sapindales
Family: Rutaceae
Genus: Cyanothamnus
Species:
C. tenuis
Binomial name
Cyanothamnus tenuis
Occurrence data from Australasian Virtual Herbarium
Synonyms[1]

Boronia tenuis(Lindl.( Benth.

Description

Cyanothamnus tenuis is a slender, woody shrub that grows to a height of 10–50 cm (4–20 in). The leaves are sessile, thread-like, 5–20 mm (0.2–0.8 in) long with a channel along the upper surface. The flowers are borne singly or in groups of two or three in leaf axils on a thin pedicel 7–15 mm (0.28–0.59 in) long. The four sepals are narrow triangular or narrow egg-shaped and about 3 mm (0.12 in) long. The petals are white to pink but pale blue on the back with a darker midline, 6–7 mm (0.24–0.28 in) long. Flowering occurs from August to December.[2][3]

Taxonomy and naming

Cyanothamnus tenuis was first formally described in 1839 by John Lindley in A Sketch of the Vegetation of the Swan River Colony.[4][5] In 1863, George Bentham changed the name to Boronia tenuis,[6] but in a 2013 paper in the journal Taxon, Marco Duretto and others changed the name back to C. tenuis on the basis of cladistic analysis.[7] The specific epithet (tenuis) is a Latin word meaning "thin".[8]

Distribution and habitat

This species grows on laterite and granite in stony soils. It is found on the Darling Scarp between Dwellingup and Wannamal in the Jarrah Forest and Swan Coastal Plain biogeographic regions.[3][2]

Conservation status

Cyanothamnus tenuis is classed as is classified as "Priority Four" by the Government of Western Australia Department of Parks and Wildlife,[2] meaning that is rare or near threatened.[9]

References
  1. "Cyanothamnus tenuis". Plants of the World Online. Retrieved 22 September 2021.
  2. "Boronia tenuis". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  3. Duretto, Marco F.; Wilson, Paul G.; Ladiges, Pauline Y. "Boronia tenuis". Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 8 May 2019.
  4. "Cyanothamnus tenuis". APNI. Retrieved 8 May 2019.
  5. Lindley, John (1839). A Sketch of the Vegetation of the Swan River Colonly (Appendix). Piccadilly: James Ridgway. p. xviii. Retrieved 8 May 2019.
  6. "Boronia tenuis". APNI. Retrieved 8 May 2019.
  7. Duretto, Marco F.; Heslewood, Margaret M.; Bayly, Michael J. (2020). "Boronia (Rutaceae) is polyphyletic: Reinstating Cyanothamnus and the problems associated with inappropriately defined outgroups". Taxon. 69 (3): 481–499. doi:10.1002/tax.12242.
  8. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 787.
  9. "Conservation codes for Western Australian Flora and Fauna" (PDF). Government of Western Australia Department of Parks and Wildlife. Retrieved 8 May 2019.
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