Boronia fraseri

Boronia fraseri, commonly known as Fraser's boronia,[2] is a plant in the citrus family occurring near Sydney in Australia. It is an erect, multi-branched shrub with pinnate leaves and pink flowers arranged in small groups in the leaf axils.

Fraser's boronia
Fraser's boronia at Glenbrook Native Plant Reserve, Australia
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Sapindales
Family: Rutaceae
Genus: Boronia
Species:
B. fraseri
Binomial name
Boronia fraseri
Occurrence data from Australasian Virtual Herbarium

Description

Boronia fraseri is an erect many-branched shrub that grows to a height of about 2 m (7 ft) with four-angled, mostly hairless branches. The leaves are pinnate, 40–125 mm (2–5 in) long and 35–70 mm (1–3 in) wide in outline on a petiole 8–30 mm (0.3–1 in) long. There are between three and seven elliptic leaflets. The end leaflet is 25–63 mm (1–2 in) long and 8–16 mm (0.3–0.6 in) wide and the side leaflets are 14–40 mm (0.6–2 in) long and 3–13 mm (0.1–0.5 in) wide. Between three and seven pink flowers are arranged on a stalk 3–15 mm (0.12–0.59 in) long. The four sepals are egg-shaped to triangular, densely hairy on the back, 2.5–3 mm (0.098–0.12 in) long and 1–2 mm (0.039–0.079 in) wide. The four petals are 6–10 mm (0.24–0.39 in) long, 4–5 mm (0.16–0.20 in) wide and hairy on the back. The eight stamens alternate in length with those opposite the petals shorter than those near the sepals. Flowering occurs from July to October and the fruit are 4–5 mm (0.16–0.20 in) long and 2.5–3 mm (0.098–0.12 in) wide.[2][3][4][5][6]

Taxonomy and naming

Boronia fraseri was first formally described by William Jackson Hooker in 1843 and the description was published in The Botanical Magazine.[7] The specific epithet (fraseri) honours Charles Fraser, the first superindentent of the Royal Botanic Gardens, Sydney.[2]

Distribution and habitat

Unlike many Boronia plants, Fraser's boronia prefers moist gullies and rainforest areas, on soils based on sandstone and is found mainly in the Sydney region but also occurs in the Blue Mountains.[4]

Conservation

Fraser's boronia is rare plant, with a ROTAP rating of 2RCa.[2]

Use in horticulture

Well drained soils with part shade are advised for cultivation. Boronia "Telopea Valley Star" is a hybrid between this species and Boronia mollis, which is hardier and has been grown in Australian gardens.[2]

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References
  1. "Boronia fraseri". Australian Plant Census. Retrieved 16 March 2020.
  2. Walters, Brian (February 2010). "Boronia fraseri". Australian Native Plants Society (Australia) website. Retrieved 31 March 2011.
  3. Les Robinson - Field Guide to the Native Plants of Sydney, ISBN 978-0-7318-1211-0 page 115
  4. Duretto, Marco F. (1999). "Systematics of Boronia section Valvatae sensu lato (Rutaceae)" (PDF). Muelleria. 12 (1): 51–52. Retrieved 14 March 2019.
  5. Weston, Peter H.; Duretto, Marco F. "Boronia fraseri". Royal Botanic Garden Sydney. Retrieved 14 March 2019.
  6. Duretto, Marco F.; Wilson, Paul G.; Ladiges, Pauline Y. "Boronia fraseri". Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 14 March 2019.
  7. "Boronia fraseri". APNI. Retrieved 14 March 2019.
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