Olearia elliptica explained

Olearia elliptica, commonly known as the sticky daisy bush,^[1] is a shrub in the family Asteraceae and is native to New South Wales and Queensland in eastern Australia. It has scattered, sticky leaves and white flowers in summer and autumn.

Description

Olearia elliptica is a shrub that typically grows to a height of and has scattered, curved, elliptic leaves long, wide on a petiole up to long. The upper surface of the leaves is sticky and the lower surface is a paler green. The heads or daisy-like "flowers" are arranged in loose groups on the ends of branches on a peduncle up to long and are wide. Each head has 8 to 23 white ray florets surrounding 8 to 30 yellow disc florets. Flowering occurs between November and May and the fruit are bristly achenes.

Taxonomy and naming

Olearia elliptica was first formally described in 1836 by Augustin Pyramus de Candolle who published the description in his 17-volume treatise, Prodromus Systematis Naturalis Regni Vegetabilis.^{[2] [3]} The specific epithet (elliptica) is a Latin word meaning "a defective circle" or "an ellipse".^[4]

In 1993, Peter Shaw Green described two subspecies of O. elliptica that have been accepted by the Australian Plant Census:^[5]

• Olearia elliptica subsp. elliptica has more heads of flowers in the corymb (between 20 and 50) and occurs in continental New South Wales and Queensland;^[6]
• Olearia elliptica subsp. praetermissa is a smaller plant with between 8 and 15 flowers in the corymb and is endemic to Lord Howe Island.^{[7] [8]} The epithet praetermissa is a Latin word meaning "overlooked", referring to the distinctness of this subspecies having only been recognised recently.

Distribution and habitat

Subspecies elliptica occurs from Berry northwards along central and eastern New South Wales to the Queensland border.^[1] It is found in areas of annual rainfall of over 900 mm in the Sydney Basin.^[9]

Use in horticulture

Sticky daisy bush adapts readily to cultivation, preferring acidic soils in part shade or sun.^[8]

Notes and References

1. Web site: Lander . Nicholas Sèan . Olearia elliptica . Royal Botanic Garden Sydney . 14 April 2019.
2. Web site: Olearia elliptica. APNI. 14 April 2019.
3. Book: de Candolle . Augustin Pyramus . Prodromus Systematis Naturalis Regni Vegetabilis (Volume 5) . 1836 . Sumptibus Sociorum Treuttel et Würtz . Paris . 271 . 14 April 2019.
4. Book: Brown. Roland Wilbur. The Composition of Scientific Words. 1956. Smithsonian Institution Press. Washington, D.C.. 346.
5. Green . Peter Shaw . Notes Relating to the Floras of Norfolk & Lord Howe Islands, IV . Kew Bulletin . 1993 . 48 . 2 . 311–312 . 10.2307/4117938. 4117938 .
6. Web site: Olearia elliptica subsp. elliptica. Australian Plant Census. 14 April 2019.
7. Web site: Olearia elliptica subsp. praetermissa. Australian Plant Census. 14 April 2019.
8. Book: Elliot, Rodger W. . Jones, David L. . Blake, Trevor . Encyclopaedia of Australian Plants Suitable for Cultivation:Volume 7 – N-Po. 1997. 74–75. Lothian Press . Port Melbourne . 0-85091-634-8.
9. Benson, Doug. McDougall, Lyn. 1994. Ecology of Sydney Plant Species Part 2: Dicotyledon families Asteraceae to Buddlejaceae. Cunninghamia. 3. 4. 895.