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Phyllode

Modified petioles or leaf stems

Modified petioles or leaf stems

Phyllodes are modified petioles or leaf stalks, which are leaf-like in both appearance and function. In some plants, these become flattened and widened, while the leaf itself becomes reduced or vanishes altogether. Thus the phyllode comes to serve the purpose of the leaf. Some important examples are Euphorbia royleana which are cylindrical and Opuntia which are flattened.

They are common in the genus Acacia, especially the Australian species, at one time put in Acacia subg. Phyllodineae. Sometimes, especially on younger plants, partially formed phyllodes bearing reduced leaves can be seen. The illustration (to the right) of Acacia suaveolens from Novae Hollandiae plantarum specimen shows the juvenile true leaves, together with the developing phyllodes, and the phyllodes of the mature plant.

The genus, Daviesia, in the family Fabaceae, is characterised in part by the plants having phyllodes.

File:Acacia suaveolens 9064505997 9f14f5f117 o.jpg|Acacia suaveolens File:Lathyrus nissolia eF.jpg|Lathyrus nissolia File:Daviesia angulata - Flickr - Kevin Thiele.jpg|Daviesia angulata File:Daviesianudiflora14633633025 079b5a9a46 o.jpg|Daviesia nudiflora File:Acacia mangium leaves.jpg|Acacia mangium

References

fr:Phyllode

References

  1. (1995). "Contributions towards a revision of ''Daviesia'' (Fabaceae: Mirbelieae). III.* A synopsis of the genus". Australian Systematic Botany.
  2. [http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&glossary=yes&alpha=P PlantNET glossary: P] National Herbarium of NSW, Royal Botanic Garden, Sydney.
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