Olearia microdisca

Olearia microdisca
Conservation status
	; Endangered (EPBC Act)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Genus:	Olearia
Species:	O. microdisca
Binomial name
	Olearia microdisca; J.M.Black[1]

Olearia microdisca, commonly known as small-flowered daisy-bush,[2] is a species of flowering plant in the family Asteraceae and is endemic to Kangaroo Island, South Australia. It is a compact shrub with small, crowded, oblong leaves and white and yellow, daisy-like inflorescences.

Habit in the Australian National Botanic Gardens

Description

Olearia microdisca is a compact shrub that typically grows to a height of up to 1.5 m (4 ft 11 in) and has many softly-hairy branches. Its leaves are crowded, sometime overlapping each other, oblong 1.5–2.5 mm (0.059–0.098 in) long, about 1 mm (0.039 in) wide and sessile. The upper surface of the leaves is glabrous, the lower surface is woolly-hairy and the edges are rolled under. The heads or daisy-like "flowers" are arranged singly on the ends of erect branches and sessile. Each head has two to five white ray florets, the ligules about 3 mm (0.12 in) long, surrounding two or three yellow disc florets. Flowering occurs in most months and the fruit is a softly-hairy achene, the pappus about 2 mm (0.079 in) long with 25 to 35 bristles.[3]

Taxonomy

Olearia microdisca was first formally described in 1928 by John McConnell Black in Transactions and Proceedings of the Royal Society of South Australia.[4][5]

Distribution and habitat

Small-flowered daisy-bush grows in heath and mallee and is restricted to Kangaroo Island in South Australia.[2][3]

Conservation status

Olearia microdisca is listed as "endangered" under the Australian Government Environment Protection and Biodiversity Conservation Act 1999. A recovery plan for nationally threatened plant species on Kangaroo Island, including O. microdisca, has been prepared.[6][7]

References

"Olearia microdisca". Australian Plant Census. Retrieved 25 May 2022.
Holliday, Ivan. "The genus Olearia". Australian Native Plants Society (Australia). Retrieved 25 May 2022.
"Olearia microdisca". State Herbarium of South Australia. Retrieved 25 May 2022.
"Olearia microdisca". APNI. Retrieved 25 May 2022.
Black, John M. (1928). "Additions to the Flora of South Australia. No. 26". Transactions and Proceedings of the Royal Society of South Australia. 52: 229. Retrieved 25 May 2022.
"SPRAT profile Olearia microdisca". Australian Government Department of Agriculture, Water and the Environment. Retrieved 25 May 2022.
"Recovery plan for nationally threatened plant species on Kangaroo Island South Australia" (PDF). Australian Government Department of Agriculture, Water and the Environment. Retrieved 25 May 2022.

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[APC-1] "Olearia microdisca". Australian Plant Census. Retrieved 25 May 2022.

[anpsa-2] Holliday, Ivan. "The genus Olearia". Australian Native Plants Society (Australia). Retrieved 25 May 2022.

[SA-3] "Olearia microdisca". State Herbarium of South Australia. Retrieved 25 May 2022.

[APNI1-4] "Olearia microdisca". APNI. Retrieved 25 May 2022.

[J.M.Black-5] Black, John M. (1928). "Additions to the Flora of South Australia. No. 26". Transactions and Proceedings of the Royal Society of South Australia. 52: 229. Retrieved 25 May 2022.

[AWE-6] "SPRAT profile Olearia microdisca". Australian Government Department of Agriculture, Water and the Environment. Retrieved 25 May 2022.

[environment-7] "Recovery plan for nationally threatened plant species on Kangaroo Island South Australia" (PDF). Australian Government Department of Agriculture, Water and the Environment. Retrieved 25 May 2022.