Isopogon sphaerocephalus

Isopogon sphaerocephalus, commonly known as drumstick isopogon[2] or Lesueur isopogon,[3] is a species of plant in the family Proteaceae and is endemic to the south-west of Western Australia. It is a shrub with linear to narrow egg-shaped leaves and spherical heads of hairy white to creamy yellow flowers.

Drumstick isopogon
In John Forrest National Park
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Proteales
Family: Proteaceae
Genus: Isopogon
Species:
I. sphaerocephalus
Binomial name
Isopogon sphaerocephalus
Occurrence data from Australasian Virtual Herbarium
Synonyms[1]
  • Atylus sphaerocephalus (Lindl.) Kuntze
  • Isopogon eriocladus Gand.
  • Isopogon ovoideus Gand.
Flower detail

Description

Isopogon sphaerocaphalus is a shrub that typically grows to a height of 0.3–2 m (1 ft 0 in – 6 ft 7 in) and has hairy brownish young branchlets and hairy young leaves. The leaves are linear to egg-shaped with the narrower end towards the base, 50–160 mm (2.0–6.3 in) long and 4–18 mm (0.16–0.71 in) wide with a small point on the end. The flowers are arranged on the ends of branchlets in sessile, spherical heads 25–30 mm (0.98–1.18 in) in diameter with hairy, egg-shaped involucral bracts at the base. The flowers are densely hairy, white to pale or creamy yellow and up to 15 mm (0.59 in) long. Flowering occurs from July to January and the fruit is a hairy nut, fused with others in a conical to oblong head 20–30 mm (0.79–1.18 in) in diameter.[4][5][6]

Taxonomy

Isopogon sphaerocephalus was first formally described by botanist John Lindley in A sketch of the vegetation of the Swan River Colony in 1839.[7][8]

In 2019, Barbara Lynette Rye described two subspecies of I. sphaerocephalus in the journal Nuytsia but the names have not been assessed by the Australian Plant Census as at November 2020:

  • Isopogon sphaerocephalus Lindl. subsp. sphaerocephalus, commonly known as "drumstick isopogon";[2]
  • Isopogon sphaerocephalus subsp. lesueurensis Rye, commonly known as "Lesueur isopogon"[3] has a longer pollen presenter, hairier branchlets and leaves and more crowded, broader leaves than the autonym.[5]

The specific epithet (sphaerocephalus) means "spherical-headed",[9]: 310  and lesueurensis refers to Mount Lesueur, where this subspecies occurs.[9]: 367 

Distribution and habitat

Subspecies sphaerocephalus grows in Jarrah forest between Gidgegannup, the Scott River area and the Kent River in the Jarrah Forest, Mallee, Swan Coastal Plain and Warren biogeographic regions.[2][5] Subspecies lesueurensis grows in shrubland on and near the sides and bases of hills in the Mount Lesueur area.[3][5]

Conservation status

Both subspecies of I. sphaerocephalus are listed as "not threatened" by the Western Australian Government Department of Parks and Wildlife.[2][3]

References
  1. "Isopogon sphaerocephalus". Australian Plant Census. Retrieved 27 November 2020.
  2. "Isopogon sphaerocephalus subsp. sphaerocaphalus". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  3. "Isopogon sphaerocephalus subsp. lesueurensis". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  4. Foreman, David B. "Isopogon sphaerocaphalus". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 28 November 2020.
  5. Rye, Barbara L.; Mcfarlane, Terry D. (2019). "A new name, clarification of synonymy, and a new subspecies for Isopogon (Proteaceae) in Western Australia" (PDF). Nuytsia. 30: 309–316. Retrieved 28 November 2020.
  6. "Isopogon sphaerocephalus". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  7. "Isopogon sphaerocephalus". APNI. Retrieved 28 November 2020.
  8. Lindley, John (1840). A Sketch of the Vegetation of the Swan River Colony. London: James Ridgway. p. xxxiv. Retrieved 28 November 2020.
  9. Sharr, Francis Aubi; George, Alex (2019). Western Australian Plant Names and Their Meanings (3rd ed.). Kardinya, WA: Four Gables Press. ISBN 9780958034180.
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