Boronia bipinnata

Boronia bipinnata, commonly known as rock boronia,[2] is a plant in the citrus family, Rutaceae and is endemic to Queensland. It is an erect shrub with bipinnate or tripinnate leaves and white, four-petalled flowers. A more widespread species previously known as Boronia pinnata and also occurring in New South Wales is now considered to be B. occidentalis.

Rock boronia
Boronia bipinnata in the Ka Ka Mundi section of Carnarvon National Park
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Sapindales
Family: Rutaceae
Genus: Boronia
Species:
B. bipinnata
Binomial name
Boronia bipinnata
Occurrence data from Australasian Virtual Herbarium

Description

Boronia bipinnata is an erect shrub that grows to a height of about 1 m (3.3 ft) with pimply, glandular stems and bipinnate or tripinnate leaves. The leaves are mostly 21–50 mm (0.83–2.0 in) long and 20–60 mm (0.79–2.4 in) wide in outline with between seven and eleven leaflets, on a petiole 4–15 mm (0.16–0.59 in) long. Between seven and twenty or more white flowers are arranged in groups in the leaf axils, the groups on a peduncle 2–8 mm (0.08–0.3 in) long. The four sepals are elliptic to more or less circular, about 1 mm (0.04 in) long and wide. The four petals are 2.5–4 mm (0.1–0.2 in) long and the eight stamens have hairy edges. Flowering occurs from September to June and the fruit are dull grey and wrinkled, about 2 mm (0.079 in) long and 1 mm (0.039 in) wide.[3]

A more widespread and common species, formerly known as Boronia bipinnata is now known as Boronia occidentalis. It has smaller leaves with fewer leaflets, fewer flowers in each group, and the stems are not glandular.[3]

Taxonomy and naming

Boronia bipinnata was first formally described in 1848 by John Lindley and the description was published in Thomas Mitchell's Journal of an Expedition into the Interior of Tropical Australia.[4][5] The specific epithet (bipinnata) is derived from the Latin prefix bi- meaning "two" or "double"[6]:823 and pinnatus meaning "feathered", "plumed" or "winged".[6]:321

Distribution and habitat

Rock boronia grows in woodland, sometimes on steep slopes and is found in the central highlands of Queensland with disjunct populations on the Blackdown Tableland and near St George.[3]

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References
  1. "Boronia bipinnata". Australian Plant Census. Retrieved 14 March 2020.
  2. "Boronia bipinnata". Queensland Government Department of Environment and Science. Retrieved 26 January 2019.
  3. Duretto, Marco F. (1999). "Notes on Boronia (Rutaceae) in eastern and northern Australia" (PDF). Muelleria. 17: 33–36. Retrieved 26 January 2019.
  4. "Boronia bipinnata". APNI. Retrieved 26 January 2019.
  5. Mitchell, Thomas (1848). Journal of an expedition into the interior of tropical Australia. p. 225. Retrieved 26 January 2019.
  6. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press.
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