Banksia tridentata

Description

Banksia tridentata is a shrub that typically grows to a height of 15–50 cm and forms a lignotuber. It has narrow egg-shaped leaves 15–45 mm long and 2.5–5 mm wide on a petiole 1–3 mm long. There is a small sharp point on the tip and sometimes two or three small teeth near the tip of the leaf. The flowers are greenish yellow and arranged in heads of between 85 and 125 with hairy, linear, tapering involucral bracts up to 15 mm long at the base of the head. The perianth is 25–28 mm long and the pistil 30–40 mm long. Flowering occurs from August to September and the fruit is a sparsely hairy, elliptical to egg-shaped follicle 11–15 mm long.

Taxonomy

This species was first formally described in 1856 by Carl Meissner who gave it the name Dryandra tridentata and published the description in Hooker's Journal of Botany and Kew Garden Miscellany.

In 1893 Benjamin Daydon Jackson accidentally listed it in Index Kewensis under Banksia, thus unwittingly publishing the name Banksia tridentata. This is now the current name for the species, as in 2007 all Dryandra species were transferred to Banksia by Austin Mast and Kevin Thiele.

Distribution and habitat

Banksia tridentata grows in kwongan between the Arrowsmith and Hill Rivers.

Ecology

An assessment of the potential impact of climate change on this species found that its range is unlikely to contract and may actually grow, depending on how effectively it migrates into newly habitable areas.

Conservation status

This banksia is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.

References

References

1. "''Banksia tridentata''".
2. {{FloraBase
3. (1999). "Flora of Australia". Australian Biological Resources Study, Canberra.
4. "''Dryandra tridentata''". APNI.
5. (1855). "New Proteaceae of Australia". Hooker's Journal of Botany and Kew Garden Miscellany.
6. (2007). "The transfer of ''Dryandra'' R.Br. to ''Banksia'' L.f. (Proteaceae)". [[Australian Systematic Botany]].
7. "''Banksia tridentata''". APNI.
8. (2008). "Climate change, plant migration, and range collapse in a global biodiversity hotspot: the ''Banksia'' (Proteaceae) of Western Australia". Global Change Biology.