''Olearia ballii'', commonly known as mountain daisy, is a species of flowering plant in the family

Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae w ...

and is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

Lord Howe Island Lord Howe Island (; formerly Lord Howe's Island) is an irregularly crescent-shaped volcanic remnant in the Tasman Sea between Australia and New Zealand, part of the Australian state of New South Wales. It lies directly east of mainland P ...

. It is a dense shrub with crowded linear leaves and small, purplish and white, daisy-like

inflorescence An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Morphologically, it is the modified part of the shoot of seed plants where flowers are formed o ...

Description

''Olearia ballii'' is a dense shrub that typically grows to a height of up to . It has crowded, more or less

sessile Sessility, or sessile, may refer to: * Sessility (motility), organisms which are not able to move about * Sessility (botany), flowers or leaves that grow directly from the stem or peduncle of a plant * Sessility (medicine), tumors and polyps that ...

, linear leaves long and wide with the edges rolled under and white, woolly hairs on the lower surface. The heads or daisy-like "flowers" are arranged singly in on the ends of the branchlets and are in diameter and sessile, with softly-hairy

bract In botany, a bract is a modified or specialized leaf, especially one associated with a reproductive structure such as a flower, inflorescence axis or cone scale. Bracts are usually different from foliage leaves. They may be smaller, larger, or of ...

s forming an involucre at the base. Each head has twenty to thirty ray

florets This glossary of botanical terms is a list of definitions of terms and concepts relevant to botany and plants in general. Terms of plant morphology are included here as well as at the more specific Glossary of plant morphology and Glossary o ...

, the white petal-like

ligule A ligule (from "strap", variant of ''lingula'', from ''lingua'' "tongue") is a thin outgrowth at the junction of leaf and leafstalk of many grasses (Poaceae) and sedges. A ligule is also a strap-shaped extension of the corolla, such as that of a ...

s up to long with purple tips, surrounding about forty purplish disc florets. Flowering mostly occurs between October and March and the fruit is an

achene An achene (; ), also sometimes called akene and occasionally achenium or achenocarp, is a type of simple dry fruit produced by many species of flowering plants. Achenes are monocarpellate (formed from one carpel) and indehiscent (they do not ope ...

about long, the pappus bristles about long.

Taxonomy

Mountain daisy was first formally described in 1874 by

Ferdinand von Mueller Baron Sir Ferdinand Jacob Heinrich von Mueller, (german: Müller; 30 June 1825 – 10 October 1896) was a German-Australian physician, geographer, and most notably, a botanist. He was appointed government botanist for the then colony of Vict ...

who gave it the name ''Aster ballii'' in '' Fragmenta Phytographiae Australiae''. In 1896, William Hemsley changed the name to ''Olearia ballii'' in the '' Annals of Botany''. The

specific epithet In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...

(''ballii'') honours Lieutenant

Henry Lidgbird Ball Henry Lidgbird Ball (7 December 1756 – 22 October 1818) was a Rear-Admiral in the Royal Navy of the British Empire. While Ball was best known as the commander of the First Fleet's , he was also notable for the exploration and the establishmen ...

who, while commanding HMS ''Supply'' in 1788, discovered and named

, where the plant was subsequently collected.

Distribution and habitat

''Olearia ballii'' is

to Australia’s Lord Howe Island where it grows on the southern mountains and is common at altitudes above .

References

{{Taxonbar, from=Q15593955 Asterales of Australia ballii Endemic flora of Lord Howe Island Plants described in 1896 Taxa named by Ferdinand von Mueller