Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems

Enantiomorphy in Banksia (Proteaceae): flowers and fruits

A. Renshaw A and S. Burgin A B

A School of Natural Sciences, College of Health and Science, University of Western Sydney, Locked Bag 1797, South Penrith DC, NSW 1797, Australia.

B Corresponding author. Email:

Australian Journal of Botany 56(4) 342-346
Submitted: 19 April 2007  Accepted: 3 April 2008   Published: 16 June 2008


There is a history of discrepancy in the interpretation of floral symmetry in the genus Banksia L.f. The variation arises not just from the potential nuances of symmetry terminology, as variation is also found in the diagrams that describe it. This paper clarifies the issue of the orientation of the ovaries within a Banksia unit inflorescence. Dissection of 2400 flowers in situ from four Banksia species has revealed the Banksia unit inflorescence to be enantiomorphic (having left-right asymmetry) due to the orientation of the ovaries. The asymmetry of the ovary and its pronounced development of the anterior side in fruit formation means that fruits are also readily distinguished as having arisen from either a left- or right-handed flower.


Douglas AW (1995) Morphological features. In ‘Flora of Australia. Vol. 16’. (Ed. P McCarthy) pp. 14–20. (CSIRO: Melbourne)

Douglas AW, Tucker SC (1996a) Inflorescence ontogeny and floral organogenesis in Grevilleoideae (Proteaceae), with emphasis on the nature of the flower pair. International Journal of Plant Sciences 157, 341–372.
CrossRef | open url image1

Douglas AW, Tucker SC (1996b) The developmental basis of diverse orientations in Grevilleoideae (Proteaceae). International Journal of Plant Sciences 157, 373–397.
CrossRef | open url image1

Endress PK (1999) Symmetry in flowers: diversity and evolution. International Journal of Plant Sciences 160, S3–S23.
CrossRef | PubMed | open url image1

Endress PK (2006) Angiosperm floral evolution: morphological developmental framework. Advances in Botanical Research 44, 1–61.
CrossRef | open url image1

George AS (1981) The genus Banksia L.f. (Proteaceae). Nuytsia 3, 239–473. open url image1

Haber JM (1960) The comparative anatomy and morphology of the flowers and inflorescences of the Proteaceae. I. Some Australian taxa. Phytomorphology 9, 325–358. open url image1

Jesson LK, Barrett SCH (2002) The genetics of mirror-image flowers. Proceedings of the Royal Society of London. Series B. Biological Sciences 269, 1835–1839.
CrossRef | open url image1

Johnson LAS, Briggs BG (1963) Evolution in the Proteaceae. Australian Journal of Botany 11, 21–61.
CrossRef | open url image1

Johnson LAS, Briggs BG (1975) On the Proteaceae – the evolution and classification of a southern family. Botanical Journal of the Linnean Society 70, 83–102.
CrossRef |
open url image1

Renshaw AJ (2005) The reproductive biology of four Banksia (L.f.) species with contrasting life histories. PhD thesis, University of Western Sydney.

Thiele K (1993) A cladistic analysis of Banksia. PhD thesis, University of Melbourne.

Venkata Rao C (1964) Studies in the Proteaceae IV. Tribes Banksieae, Musgraveae and Embothrieae. Proceedings of the National Institute of Science India 30B, 197–244.

Wardrop AB (1983) The opening mechanism of follicles of some species of Banksia. Australian Journal of Botany 31, 485–500.
CrossRef | open url image1

Wrigley JW , Fagg M (1991) ‘Banksias, waratahs and grevilleas.’ (Collins Angus and Robertson: Sydney)

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