''Cyanothamnus bipinnatus'', commonly known as rock boronia, 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-

petal Petals are modified Leaf, leaves that surround the reproductive parts of flowers. They are often advertising coloration, brightly colored or unusually shaped to attract pollinators. All of the petals of a flower are collectively known as the ''c ...

led flowers. A more widespread species previously known as ''Boronia pinnata'' and also occurring in New South Wales is now considered to be '' B. occidentalis''.

Description

''Cyanothamnus bipinnatus'' is an erect shrub that grows to a height of about with pimply, glandular stems and bipinnate or tripinnate leaves. The leaves are mostly long and wide in outline with between seven and eleven leaflets, on a petiole long. Between seven and twenty or more white flowers are arranged in groups in the leaf

axil A leaf ( : leaves) is any of the principal appendages of a vascular plant stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, st ...

s, the groups on a

peduncle Peduncle may refer to: *Peduncle (botany), a stalk supporting an inflorescence, which is the part of the shoot of seed plants where flowers are formed *Peduncle (anatomy), a stem, through which a mass of tissue is attached to a body **Peduncle (art ...

long. The four sepals are elliptic to more or less circular, about long and wide. The four

s are long and the eight

stamen The stamen (plural ''stamina'' or ''stamens'') is the pollen-producing reproductive organ of a flower. Collectively the stamens form the androecium., p. 10 Morphology and terminology A stamen typically consists of a stalk called the filame ...

s have hairy edges. Flowering occurs from September to June and the fruit are dull grey and wrinkled, about long and wide.

Taxonomy and naming

This species was first formally described in 1848 by

John Lindley John Lindley FRS (5 February 1799 – 1 November 1865) was an English botanist, gardener and orchidologist. Early years Born in Catton, near Norwich, England, John Lindley was one of four children of George and Mary Lindley. George Lindley w ...

and the description was published in Thomas Mitchell's ''Journal of an Expedition into the Interior of Tropical Australia''. In a 2013 paper in the journal '' Taxon'',

Marco Duretto Marco Duretto (born 1964) is a manager and senior research scientist at the Royal Botanic Gardens Sydney in Australia. His primary research interests are systematics and conservation of Rutaceae, Rubiaceae, Orchidaceae, Stylidiaceae and evo ...

and others changed the name to ''Cyanothamnus bipinnatus'' on the basis of cladistic analysis. The

specific epithet In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...

(''bipinnatus'') is derived from the Latin

prefix A prefix is an affix which is placed before the Word stem, stem of a word. Adding it to the beginning of one word changes it into another word. For example, when the prefix ''un-'' is added to the word ''happy'', it creates the word ''unhappy'' ...

''bi-'' meaning "two" or "double" and ''pinnatus'' meaning "feathered", "plumed" or "winged".

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 Saint George (Greek language, Greek: Γεώργιος (Geórgios), Latin language, Latin: Georgius, Arabic language, Arabic: القديس جرجس; died 23 April 303), also George of Lydda, was a Christians, Christian who is venerated as a sa ...

References

{{Taxonbar, from=Q106901906 bipinnatus Flora of Queensland Plants described in 1848 Taxa named by John Lindley