Three-toothed coneflower
Isopogon tridens in the ANBG
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Proteales
Family: Proteaceae
Genus: Isopogon
Species:
I. tridens
Binomial name
Isopogon tridens
Synonyms[1]
  • Atylus tridens (Meisn.) Kuntze
  • Isopogon trilobus var. tridens Meisn.

Isopogon tridens, commonly known as the three-toothed coneflower,[2] is a species of flowering plant in the family Proteaceae and is endemic to the southwest of Western Australia. It is a shrub with wedge-shaped leaves with two or three sharply-pointed teeth, and flattened-spherical heads of glabrous creamy white, sometimes purple flowers.

Description

Isopogon tridens is a shrub that typically grows to a height of 1–1.5 m (3 ft 3 in – 4 ft 11 in) and has hairy, pale reddish to greyish-brown branchlets. The leaves are wedge-shaped, 35–85 mm (1.4–3.3 in) long, with two or three sharply-pointed lobes or teeth near the tip. The flowers are arranged on the ends of branchlets in sessile, flattened-spherical heads 20–30 mm (0.79–1.18 in) in diameter with hairy, broadly egg-shaped involucral bracts at the base. The flowers are more or less glabrous, creamy white or rarely deep purple, and 22–28 mm (0.87–1.10 in) long. Flowering occurs from June to July and the fruit is a hairy nut, fused with others in a flattened-spherical head about 20 mm (0.79 in) in diameter.[2][3]

Taxonomy

Three-toothed coneflower was first formally described in 1855 by Carl Meissner who gave it the name Isopogon trilobus var. tridens in Hooker's Journal of Botany and Kew Garden Miscellany from specimens collected by James Drummond.[4][5] In 1868, Ferdinand von Mueller changed the name to Isopogon tridens in 'Fragmenta phytographiae Australiae.[6][7]

Distribution and habitat

Isopogon tridens usually grows shrubland or heath and in a small area from near the Arrowsmith River to Eneabba in the Geraldton Sandplains biogeographic region in the south-west of Western Australia.[2][3]

Conservation status

This isopogon is classified as "not threatened" by the Government of Western Australia Department of Parks and Wildlife.[2]

References

  1. 1 2 "Isopogon tridens". Australian Plant Census. Retrieved 29 November 2020.
  2. 1 2 3 4 "Isopogon tridens". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  3. 1 2 Foreman, David B. "Isopogon tridens". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 29 November 2020.
  4. ↑ "Isopogon trilobus var. tridens". APNI. Retrieved 29 November 2020.
  5. ↑ Meissner, Carl (1855). "New Proteaceae of Australia". Hooker's Journal of Botany and Kew Gardens Miscellany. 7: 70. Retrieved 29 November 2020.
  6. ↑ "Isopogon tridens". APNI. Retrieved 29 November 2020.
  7. ↑ von Mueller, Ferdinand (1868). Fragmenta phytographiae Australiae. Vol. 6. Melbourne: Victorian Government Printer. p. 239. Retrieved 29 November 2020.
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