Grevillea amplexans

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Grevillea amplexans
Grevillea amplexans.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Proteales
Family: Proteaceae
Genus: Grevillea
Species:
G. amplexans
Binomial name
Grevillea amplexans
Subspecies
  • Grevillea amplexans subsp. adpressa
  • Grevillea amplexans subsp. amplexans
  • Grevillea amplexans subsp. semivestita

Grevillea amplexans is a species of flowering plant in the family Proteaceae and is endemic to the Mid West region of Western Australia. It is a spreading shrub with arching branches, stem-clasping, sharply-pointed, lobed or toothed leaves and white to cream-coloured flowers.

Contents

Description

Grevillea amplexans is a spreading shrub that typically grows to a height of 1–3 m (3 ft 3 in – 9 ft 10 in) and has arching branches. Its leaves are 7–26 mm (0.28–1.02 in) long, 10–35 mm (0.39–1.38 in) wide and star-shaped or egg-shaped with three to seven lobes or five to eleven teeth on the edges, and a stem-clasping base. The flowers are arranged in more or less spherical to domed groups on the ends of branches. The flowers are white to cream-coloured and glabrous, the pistil 2.5–5.8 mm (0.098–0.228 in) long with a white style. Flowering occurs from July to December and the fruit is an oblong follicle 9–12 mm (0.35–0.47 in) long. [3] [4]

Taxonomy

Grevillea amplexans was first formally described in 1870 by George Bentham from an unpublished description by Ferdinand von Mueller in Flora Australiensis . [5] The specific epithet (amplexans) means "encircling" or "embracing", referring to the base of the leaves. [6]

In 2000, Makinson and Wilson described three subspecies in the Flora of Australia , and the names are accepted by the Australian Plant Census:

(Grevillea amplexans subsp. adpressa was first formally described in 1993 by Olde and Marriott who gave it the name Grevillea adpressa in the journal Nuytsia .) [16] [17]

Distribution and habitat

This grevillea grows in sand on sandplains between Geraldton, Coomberdale and Moora in the Avon Wheatbelt, Geraldton Sandplains and Swan Coastal Plain biogeographic regions of Western Australia. [4] Subspecies adpressa grows in low heath between Mingenew and Watheroo, [8] [9] and subsp. amplexans grows in heathland or mallee-shrubland [11] [12] and subsp. semivestita occurs in shrubland and heath from Watheroo National Park to near Carnamah. [14] [15]

Conservation status

Grevillea amplexans is listed as an endangered species by the International Union for Conservation of Nature, due to having an area of occupancy less than 200 km2, a severely fragmented range and a continuing decline of habitat due to ongoing clearance of roadside verges. Other potential threats to the species include altered fire regimes and competition with invasive weed species. [1]

Subspecies amplexans is classified as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions, [12] but subsp. adpressa is listed as "Priority One" meaning that it is known from only one or a few locations which are potentially at risk, [18] and subsp. semivestita as "Priority Two" [15] meaning that it is poorly known and from only one or a few locations. [18]

Related Research Articles

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<i>Grevillea wickhamii</i> Species of shrub in the family Proteaceae endemic to Australia

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<i>Grevillea fililoba</i> Species of shrub in the family Proteaceae endemic to Western Australia

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<i>Grevillea thyrsoides</i> Species of shrub in the family Proteaceae endemic to Western Australia

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<i>Grevillea agrifolia</i> Species of plant in the family Proteaceae

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<i>Grevillea synapheae</i> Species of shrub in the family Proteaceae endemic to Western Australia

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<i>Grevillea biformis</i> Species of shrub in the family Proteaceae endemic to Western Australia

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<i>Grevillea plurijuga</i> Species of shrub in the family Proteaceae endemic to Western Australia

Grevillea plurijuga is a species of flowering plant in the family Proteaceae and is endemic to southern Western Australia. It is a prostrate to low-lying or dense mounded to erect shrub with divided leaves with linear lobes and loose clusters of hairy, red or pink flowers.

<i>Grevillea althoferorum</i> Species of shrub in the family Proteaceae endemic to Western Australia

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<i>Grevillea insignis</i> Species of shrub in the family Proteaceae endemic to Western Australia

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<i>Grevillea bracteosa</i> Species of shrub in the family Proteaceae endemic to Western Australia

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<i>Grevillea coccinea</i> Species of shrub in the family Proteaceae endemic to Western Australia

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<i>Grevillea haplantha</i> Species of shrub in the family Proteaceae endemic to Western Australia

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<i>Grevillea pyramidalis</i> Species of shrub in the family Proteaceae endemic to Western Australia

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<i>Grevillea shuttleworthiana</i> Species of shrub in the family Proteaceae endemic to Western Australia

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<i>Grevillea neorigida</i> Species of plant in the Proteaceae family

Grevillea neorigida is a species of flowering plant in the family Proteaceae and is endemic to Western Australia. It is compact, spreading shrub with deeply-divided leaves, the end lobes linear and somewhat sharply-pointed, and clusters of creamy-brown to off-white flowers with a scarlet or orange-red style.

References

  1. 1 2 Keighery, G.; Makinson, R.; Monks, L. (2020). "Grevillea amplexans". IUCN Red List of Threatened Species . 2020: e.T112645835A113307636. doi: 10.2305/IUCN.UK.2020-2.RLTS.T112645835A113307636.en . Retrieved 20 December 2023.
  2. "Grevillea amplexans". Australian Plant Census. Retrieved 21 November 2021.
  3. "Grevillea amplexans". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 21 November 2021.
  4. 1 2 "Grevillea amplexans". FloraBase . Western Australian Government Department of Biodiversity, Conservation and Attractions.
  5. "Grevillea amplexans". APNI. Retrieved 21 November 2020.
  6. Sharr, Francis Aubi; George, Alex (2019). Western Australian Plant Names and Their Meanings (3rd ed.). Kardinya, WA: Four Gables Press. p. 131. ISBN   9780958034180.
  7. "Grevillea amplexans subsp. adpressa". Australian Plant Census. Retrieved 21 November 2021.
  8. 1 2 "Grevillea amplexans subsp. adpressa". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 21 November 2021.
  9. 1 2 "Grevillea amplexans subsp. adpressa". FloraBase . Western Australian Government Department of Biodiversity, Conservation and Attractions.
  10. "Grevillea amplexans subsp. amplexans". Australian Plant Census. Retrieved 21 November 2021.
  11. 1 2 "Grevillea amplexans subsp. amplexans". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 21 November 2021.
  12. 1 2 3 "Grevillea amplexans subsp. amplexans". FloraBase . Western Australian Government Department of Biodiversity, Conservation and Attractions.
  13. "Grevillea amplexans subsp. semivestita". Australian Plant Census. Retrieved 21 November 2021.
  14. 1 2 "Grevillea amplexans subsp. semivestita". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 21 November 2021.
  15. 1 2 3 "Grevillea amplexans subsp. semivestita". FloraBase . Western Australian Government Department of Biodiversity, Conservation and Attractions.
  16. "Grevillea adpressa". APNI. Retrieved 21 November 2020.
  17. Olde, Peter M.; Marriott, Neil R. (1993). "New species and taxonomic changes in Grevillea (Proteaceae: Grevilleoideae) from south-west Western Australia". Nuytsia. 9 (2): 250–252. Retrieved 20 November 2021.
  18. 1 2 "Conservation codes for Western Australian Flora and Fauna" (PDF). Government of Western Australia Department of Parks and Wildlife. Retrieved 16 December 2015.