Coastal hakea
Hakea clavata in the Cape Le Grand National Park
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Proteales
Family: Proteaceae
Genus: Hakea
Species:
H. clavata
Binomial name
Hakea clavata
Occurrence data from AVH

Hakea clavata, commonly known as coastal hakea[2] is a shrub that is endemic to an area along the south coast of Western Australia. It has thick leaves, pink and grey flowers and grows on rocky outcrops.

Hakea clavata growing on a rocky granite outcrop at Lucky Bay

Description

Hakea clavata is a lignotuberous spreading or sprawling shrub up to 2.5 metres (8 ft) wide and 0.5 to 2.0 m (1.6 to 6.6 ft) high. Mid-green leaves are thick, flattened, long and narrow 2 to 8 centimetres (0.8 to 3.1 in) long and 4 to 11 millimetres (0.157 to 0.433 in) wide, ending in a hard sharp point. Sometimes club-shaped widening at the apex. The inflorescence has 60-80 white and pink flowers appearing in short racemes in leaf axils and tips of branches. The perianth has a pink claw, grey limbs and white interior. Woody fruit are egg-shaped with the widest part nearer the stem 1.5 to 2.5 cm (0.59 to 0.98 in) long and 0.9 to 1.0 cm (0.35 to 0.39 in) wide. Alternatively egg-shaped with the wider section toward the apex, both shapes having two small horns at the back of the fruit. The black-brown seeds have an obliquely obovate shape and a length of 16 mm (0.630 in). Each seed has a broad wing along one side of seed body.[3][4][5]

Taxonomy

Hakea clavata was first formally described in 1805 by Jacques Labillardière in Novae Hollandiae plantarum specimen. Labillardière may have made a type collection when at the Esperance region in December 1792.[6] The specific epithet (clavata) is derived from the Latin word clava meaning "club",[7] referring to the club-shape of the leaves.[3]

Distribution

Coastal hakea is found on the mainland and on some of the islands between Israelite Bay and Esperance and a single population is known at Hopetoun to the west.[3] The range covers southeastern areas of the Southwest Botanical Province. The species grows in rocky sandy clay soils among granite outcrops and withstands salt laden winds.[8]

References

  1. ↑ "Hakea clavata". APNI. Retrieved 23 January 2019.
  2. ↑ Holliday, Ivan. "Hakeas a Field and Garden Guide". Reed New Holland. ISBN 0-9585778-2-X.
  3. 1 2 3 "Hakea clavata". Fact Sheet. Government of South Australia. Retrieved 11 October 2018.
  4. ↑ "Hakea clavata". Flora of Australia online. Retrieved 17 October 2018.
  5. ↑ Archer, William. "Coastal hakea - Hakea clavata". Esperance Wildflowers. Retrieved 17 October 2018.
  6. ↑ Hopper, Stephen (2003). "South-western Australia, Cinderella of the world's temperate floristic regions 1". Curtis's Botanical Magazine. 21 (2): 132–179. doi:10.1111/1467-8748.00380.
  7. ↑ Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 231.
  8. ↑ "Hakea clavata Labill". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
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