Isopogon buxifolius
Subspecies obovatus in the ANBG
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Proteales
Family: Proteaceae
Genus: Isopogon
Species:
I. buxifolius
Binomial name
Isopogon buxifolius
Occurrence data from Australasian Virtual Herbarium
Synonyms[1]
  • Atylus buxifolius (R.Br.) Kuntze
  • Isopogon buxifolius var. typicus Benth.

Isopogon buxifolius is a species of plant in the family Proteaceae and is endemic to the south-west of Western Australia. It is an upright shrub with egg-shaped to elliptic or oblong leaves and clustered spikes of pink flowers.

Description

Isopogon buxifolius is an upright shrub that typically grows to a height of 0.3–1.7 m (1 ft 0 in – 5 ft 7 in) and has mostly hairy reddish to brownish branchlets. The leaves are egg-shaped, elliptic, oblong, or egg-shaped with the narrower end towards the base and 8–35 mm (0.31–1.38 in) long with a small point on the tip. The flowers are arranged in more or less sessile spikes up to 20 mm (0.79 in) long and surrounded by leaves. The few involucral bracts are lance-shaped, the flowers 10–15 mm (0.39–0.59 in) long, pink and more or less glabrous. Flowering occurs from June to December and the fruit is an oval, hairy nut, fused with others in a cup-shaped head about 10 mm (0.39 in) long.[2][3]

Taxonomy

Isopogon buxifolius was first formally described in 1810 by Robert Brown in the Transactions of the Linnean Society of London.[4][5]

In 1870, George Bentham described four varieties of I. buxifolius in Flora Australiensis[6] and two of his names are accepted by the Australian Plant Census:

  • Isopogon buxifolius R.Br. var. buxifolius[7] that has mostly egg-shaped 10–15 mm (0.39–0.59 in) long, flowering mostly from July to December.[8][9]
  • Isopogon buxifolius var. obovatus (R.Br.) Benth.[10] (originally described in 1830 by Robert Brown as Isopogon spathulatus var. obovatus)[11][12] that has oblong or egg-shaped leaves with the narrower end towards the base, 15–35 mm (0.59–1.38 in) long and 7–14 mm (0.28–0.55 in) wide, flowering mostly from June to October.[13][14]

Bentham's I. buxifolius var. linearis and var. spathulatus are now regarded as a synonyms of I. spathulatus.[15]

Distribution and habitat

Variety buxifolius grows in swampy areas between Collie, Denmark and Albany[8][9] and var. obovatus has been recorded in sandy loam over laterite in a small area between the Stirling Range, Cape Riche and Bremer Bay.[13][14]

Conservation status

Variety buxifolius is classified as "Priority Two" by the Government of Western Australia Department of Parks and Wildlife, meaning that it is poorly known and from only one or a few locations[9] and var. obovatus as "Priority Three", meaning that it is poorly known and known from only a few locations but is not under imminent threat.[14][16]

References

  1. 1 2 "Isopogon buxifolius". Australian Plant Census. Retrieved 21 November 2020.
  2. ↑ Foreman, David B. "Isopogon buxifolius". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 21 November 2020.
  3. ↑ "Isopogon buxifolius". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  4. ↑ "Isopogon buxifolius". APNI. Retrieved 21 November 2020.
  5. ↑ Brown, Robert (1810). "On the Proteaceae of Jussieu". Transactions of the Linnean Society of London. 10 (1): 73. Retrieved 21 November 2020.
  6. ↑ Bentham, George; von Mueller, Ferdinand (1870). Flora Australiensis. Vol. 5. London: Lovell Reeve & Co. p. 341. Retrieved 21 November 2020.
  7. ↑ "Isopogon buxifolius var. buxifolius". Australian Plant Census. Retrieved 22 November 2020.
  8. 1 2 Foreman, David B. "Isopogon buxifolius var. obovatus". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 21 November 2020.
  9. 1 2 3 "Isopogon buxifolius var. buxifolius". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  10. ↑ "Isopogon buxifolius var. obovatus". Australian Plant Census. Retrieved 21 November 2020.
  11. ↑ "Isopogon spathulatus var. obovatus". APNI. Retrieved 21 November 2020.
  12. ↑ Brown, Robert (1830). Proteaceas Novas. Supplementum primum prodromi florae Novae Hollandiae. London: Typis R. Taylor,1830. pp. 8–9. Retrieved 21 November 2020.
  13. 1 2 Foreman, David B. "Isopogon buxifolius var. obovatus". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 21 November 2020.
  14. 1 2 3 "Isopogon buxifolius var. obovatus". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  15. ↑ "Isopogon spathulatus". Australian Plant Census. Retrieved 22 November 2020.
  16. ↑ "Conservation codes for Western Australian Flora and Fauna" (PDF). Government of Western Australia Department of Parks and Wildlife. Retrieved 22 November 2020.
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