Olearia strigosa, commonly known as bristly daisy bush,[2] is a species of flowering plant in the family Asteraceae and is endemic to the south-west of Western Australia. It is an erect shrub with linear leaves and blue or purple, daisy-like inflorescences.

Olearia strigosa

Priority Three — Poorly Known Taxa (DEC)
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Olearia
Species:
O. strigosa
Binomial name
Olearia strigosa
Synonyms[1]
  • Aster steetzii F.Muell.
  • Eurybia aspera Steetz
  • Eurybia strigosa Steetz
  • Olearia steetzii F.Muell. nom. inval., pro syn.
  • Shawia aspera (Steetz) Sch.Bip.
  • Shawia strigosa (Steetz) Sch.Bip.

Description

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Olearia strigosa is a shrub that typically grows to a height of up to 0.5–1.5 m (1 ft 8 in – 4 ft 11 in), its stems and leaves covered with bristly hairs. The leaves are linear, 2.5–18 mm (0.098–0.709 in) long and 1.0–2.5 mm (0.039–0.098 in) wide and sessile or on a petiole up to 1 mm (0.039 in) long. The heads or daisy-like "flowers" are arranged singly or in racemes on the ends of branches on a peduncle up to 22 mm (0.87 in) long and are 11–20 mm (0.43–0.79 in) in diameter with a conical or hemispherical involucre at the base. Each head has 7 to 11 blue or purple ray florets, the ligule 7.0–9.5 mm (0.28–0.37 in) long, surrounding 9 to 30 disc florets. Flowering occurs from January to May and the fruit is an achene, the pappus with 30 to 56 long bristles and 4 to 10 short ones.[3][2]

Taxonomy

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This daisy was first formally described in 1845 by Joachim Steetz who gave it the name Eurybia strigosa in Johann Georg Christian Lehmann's Plantae Preissianae.[4][5] In 1867 George Bentham changed the name to Olearia strigosa in Flora Australiensis.[6] The specific epithet (strigosa) means "strigose".[7]

Distribution and habitat

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Bristly daisy bush grows with herbs and sedges in the understorey of low woodland in the southern part of the Swan Coastal Plain and the Jarrah Forest bioregions of south-western Western Australia.[3][2]

Conservation status

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Olearia strigosa is listed as "Priority Three" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions,[2] meaning that it is poorly known and known from only a few locations but is not under imminent threat.[8]

References

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  1. ^ a b "Olearia strigosa". Australian Plant Census. Retrieved 4 August 2022.
  2. ^ a b c d "Olearia strigosa". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  3. ^ a b Lander, Nicholas S. (1990). "Elucidation of Olearia species related to O. paucidentata (Asteraceae: Astereae)" (PDF). Nuytsia. 18 (1): 91–93. Retrieved 4 August 2022.
  4. ^ "Eurybia strigosa". APNI. Retrieved 4 August 2022.
  5. ^ Steetz, Joachim (1845). Lehmann, Johann G.C. (ed.). Plantae Preissianae. Vol. 1. Hamburg. pp. 419–420. Retrieved 4 August 2022.
  6. ^ "Olearia strigosa". APNI. Retrieved 4 August 2022.
  7. ^ Sharr, Francis Aubi; George, Alex (2019). Western Australian Plant Names and Their Meanings (3rd ed.). Kardinya, WA: Four Gables Press. p. 315. ISBN 9780958034180.
  8. ^ "Conservation codes for Western Australian Flora and Fauna" (PDF). Government of Western Australia Department of Parks and Wildlife. Retrieved 4 August 2022.