Rose coneflower
Isopogon formosus at San Francisco Botanical Garden
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Proteales
Family: Proteaceae
Genus: Isopogon
Species:
I. formosus
Binomial name
Isopogon formosus
Occurrence data from Australasian Virtual Herbarium
Synonyms[1]
  • Atylus formosus (R.Br.) Kuntze
  • Isopogon formosus var. eriolepis Meisn.

Isopogon formosus, commonly known as rose coneflower,[2] is a species of flowering plant in the family Proteaceae and is endemic to the south-west of Western Australia. It is a shrub with divided leaves with cylindrical segments, and spherical to oval heads of pink or red flowers.

Description

Isopogon formosus is an erect or spreading shrub that typically grows to a height of 1.5–2 m (4 ft 11 in – 6 ft 7 in) with pale to reddish brown young branchlets. The leaves are up to 35 mm (1.4 in) long on a petiole up to 25 mm (0.98 in) long, and divided with grooved cylindrical segments that have a sharply-pointed tip. The flowers are arranged on the ends of branchlets or in upper leaf axils, in sessile, spherical to oval heads about 60 mm (2.4 in) in diameter with egg-shaped to lance-shaped involucral bracts at the base. The flowers are red or mauve-pink and more or less glabrous, and the fruit is a hairy nut fused with others in a spherical or oval head up to 20 mm (0.79 in) long in diameter.[3][4][2]

Taxonomy

Isopogon formosus was first formally described in 1810 by Robert Brown and the description was published in Transactions of the Linnean Society.[5][6] The specific epithet (formosus) is a Latin word meaning "beautifully-formed" or "handsome".[7]

In 1995, Donald Bruce Foreman described two subspecies of I. formosus in the Flora of Australia, and the names are accepted by the Australian Plant Census:

  • Isopogon formosus subsp. dasylepis (Meisn.) Foreman[8][9] that has generally hairier stems, leaves and involucral bracts than the autonym and flowers mainly from June to December;[10]
  • Isopogon formosus R.Br. subsp. formosus[11][12] is more or less glabrous and mainly flowers from May to November.[10]

Subspecies dasylepis was originally described in 1856 by Carl Meissner as I. formosus var. dasylepis in de Candolle's Prodromus Systematis Naturalis Regni Vegetabilis.[13][14]

In a 2017 paper in the journal Nuytsia, Rye and Hislop reduced I. heterophyllus to a synonym of I. formosus subsp. formosus, but the change has not been accepted by the Australian Plant Census as at November 2020.[10]

Distribution and habitat

Rose coneflower grows in a range of soils in swampy places, rocky outcrops and on sandplains mainly between Bunbury and Esperance in the Esperance Plains and Jarrah Forest biogeographic regions.[3] Subspecies dasylepis occurs between Busselton, Noggerup and the Scott River and subsp. formosus in near-coastal areas between Walpole and Hopetoun and from Dalyup to Cape Arid National Park.[10]

Conservation status

Subspecies formosus is classified as "not threatened"[9] but subsp. dasylepis is classified as "Priority Three" by the Government of Western Australia Department of Parks and Wildlife[12] meaning that it is poorly known and known from only a few locations but is not under imminent threat.[15]

Use in horticulture

Isopogon formosus requires excellent drainage and full sun. It will not tolerate long periods of dryness or heavy frost.[2][16]

References

  1. 1 2 "Isopogon formosus". Australian Plant Census. Retrieved 24 November 2020.
  2. 1 2 3 Corvisy, Rachael. "Isopogon formosus - Rose coneflower". Australian National Botanic Garden. Retrieved 13 October 2018.
  3. 1 2 "Isopogon formosus". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  4. ↑ Foreman, David B. "Isopogon formosus". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 28 November 2020.
  5. ↑ "Isopogon formosus". APNI. Retrieved 28 November 2020.
  6. ↑ Brown, Robert (1810). "On the Proteaceae of Jussieu". Transactions of the Linnean Society. 10: 72.
  7. ↑ Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 345.
  8. ↑ "Isopogon formosus subsp. dasylepis". Australian Plant Census. Retrieved 28 November 2020.
  9. 1 2 "Isopogon formosus subsp. dasylepis". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  10. 1 2 3 4 Rye, Barbara L.; Hislop, Michael (2017). "Two new synonyms in Western Australian Proteaceae: Isopogon heterophyllus and I. teretifolius subsp. petrophiloides". Nuytsia. 28: 169–172.
  11. ↑ "Isopogon formosus". Australian Plant Census. Retrieved 28 November 2020.
  12. 1 2 "Isopogon formosus subsp. formosus". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  13. ↑ "Isopogon formosus var. dasylepis". APNI. Retrieved 28 November 2020.
  14. ↑ Meissner, Carl; de Candolle, Augustus P. (1856). Prodromus Systematis Naturalis Regni Vegetabilis. Paris: Sumptibus Victroris Masson. p. 278. Retrieved 28 November 2020.
  15. ↑ "Conservation codes for Western Australian Flora and Fauna" (PDF). Government of Western Australia Department of Parks and Wildlife. Retrieved 28 November 2020.
  16. ↑ Wrigley, John W.; Fagg, Murray (1983). Australian native plants : a manual for their propagation, cultivation and use in landscaping (2nd ed.). Sydney: Collins. p. 249. ISBN 0002165759.
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