Banksia anatona

Banksia anatona, commonly known as the cactus dryandra,[1] is a flowering plant in the family, Proteaceae and is endemic to Western Australia. It is a tall, spindly shrub with unusually large fruiting follicles. It is only known from a single location and has been classified as Critically Endangered nationally under the Environment Protection and Biodiversity Conservation Act 1999.[1] The only known population is in danger of extinction from dieback disease.

Cactus dryandra
Banksia anatona in Royal Botanic Gardens, Cranbourne
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Proteales
Family: Proteaceae
Genus: Banksia
Subgenus: Banksia subg. Banksia
Series: Banksia ser. Dryandra
Species:
B. anatona
Binomial name
Banksia anatona
Synonyms[2]
  • Dryandra anatona A.S.George
  • Dryandra sp. 48 (A.S.George 16886)

Description

Banksia anatona is a shrub with a single stem and short side branches, sometimes growing to a height of 5 m (20 ft). Unlike many others in the Banksia genus, it does not have a lignotuber. The branches are covered with a layer of matted hairs. The leaves are wedge-shaped with the narrow end towards the base, have a hairy stalk 3–7 mm (0.1–0.3 in) long and a leaf blade 30–70 mm (1–3 in) long and 12–22 mm (0.5–0.9 in) wide. The upper surface of the leaf blade is hairy at first, but becomes glabrous with age and the lower surface is covered with a layer of matted hairs. The leaf surface is wavy and there are 10 to 12 serrations on each side.[3][4][5]

The flower spike develops on the ends of the main branch or on the side branches and is composed of about 170 individual flowers. The pollen presenter is 4–5 mm (0.16–0.20 in) long. Flowers appear between January and June and the fruits which appear after flowering are egg-shaped with the narrow end towards the base and are about 24 mm (0.9 in) long and hairy.[3][4][5]

Taxonomy and naming

The species was first formally described in 1996 by Alex George who gave it the name Dryandra anatona. The description was published in Nuytsia.[6] In 2007, Austin Mast and Kevin Thiele transferred all the dryandras to the genus Banksia and this species became Banksia anatona.[7][8] The specific epithet (anatona) is derived from the Ancient Greek words τόνος (tónos) meaning "rope" or "chord"[9]: 667  and ἀνα- (ana-) meaning "up" or "upwards"[9]: 657  referring to the tall, spindly habit of this species.[3]

Distribution and habitat

Banksia anatona is only known from a restricted area in the Stirling Range National Park in the Esperance Plains biogeographic region.[10] It is threatened by dieback disease caused by the fungus Phytophthora cinnamomi, although a small population has been established on private property elsewhere. It grows in sandy soil on slopes with dense kwongan vegetation.[3][4][5]

Conservation

This species has been classified as "Threatened Flora (Declared Rare Flora — Extant)" by the Department of Environment and Conservation (Western Australia)[10] and as "critically endangered" by the Australian Government Department of the Environment under the Environment Protection and Biodiversity Conservation Act 1999.[5]

References
  1. "Banksia anatona — Cactus Dryandra". Species Profile and Threats Database. Department of the Environment and Water Resources. Retrieved 2 January 2016.
  2. "Banksia anatona". Australian Plant Census. Retrieved 26 March 2020.
  3. George, Alex S. (1996). "New taxa and a new infrageneric classification in Dryandra R.Br". Nuytsia. 10 (3): 353–354.
  4. "Approved Conservation Advice for Dryandra anatona (Cactus Dryandra)" (PDF). Australian Government Department of the Environment. Retrieved 11 February 2016.
  5. "Advice to the Minister for Sustainability, Environment, Water, Population and Communities" (PDF). Australian Government Department of the Environment. Retrieved 11 February 2016.
  6. "Dryandra anatona". APNI. Retrieved 11 February 2016.
  7. "Banksia anatona". APNI. Retrieved 11 February 2016.
  8. Mast, Austin R.; Thiele, Kevin (2013). "The transfer of Dryandra R.Br. to Banksia L.f. (Proteaceae)". Australian Systematic Botany. 20 (1): 63–71. doi:10.1071/SB06016.
  9. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press.
  10. "Banksia anatona". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
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