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Hillock bush
	Cultivated specimen, Quito, Ecuador.
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Myrtales
Family:	Myrtaceae
Genus:	Melaleuca
Species:	M. hypericifolia
Binomial name
	Melaleuca hypericifolia; Sm.
Synonyms
	Cajuputi hypericifolia (Sm.) Skeels; Metrosideros hypericifolia (Sm.) Salisb.; Myrtoleucodendron hypericifolium (Sm.) Kuntze;

Melaleuca hypericifolia, commonly known as hillock bush, is a plant in the myrtle family, Myrtaceae, genus Melaleuca and is endemic to New South Wales in Australia. It has large, orange to red flower spikes and consequently is a commonly cultivated species. In 1797, James Edward Smith described the plant as:

"The most beautiful of the genus. It grows in swampy ground ...is plentiful in the English gardens, and was generally taken for an Hypericum, till it lately produced, in several collections near London, its elegant flowers."

Description

Melaleuca hypericifolia is a large woody shrub or small tree growing to 6 m (20 ft) in height, with greyish papery bark. Its leaves are arranged in alternate pairs (decussate), 10–40 mm (0.4–2 in) long, 4–10 mm (0.2–0.4 in) wide, narrow elliptic in shape with a central groove on the upper surface.^[2]^[3]^[4]

The flowers are red to orange, arranged in a spike, usually on the older wood. The spike is up to 60 mm (2 in) in both diameter and length and contains up to 40 individual flowers. The petals are 4.5–7 mm (0.2–0.3 in) long and fall off as the flower ages. The stamens are arranged in five bundles around the flower with 16 to 25 stamens per bundle. The flower spikes appear in spring and summer and are followed by fruit which are woody, oval-shaped capsules 5–6.5 mm (0.2–0.3 in) long with the sepals remaining as teeth around the rim. As the plant ages, the capsules become compressed together.^[2]^[3]^[4]

Taxonomy and naming

The species was first formally described by English botanist James Edward Smith in 1797 in Transactions of the Linnean Society of London from material collected in "swampy ground" in New South Wales.^[5]^[6] The species name references the similarity of the leaves to those of species of Hypericum.^[7]

Distribution and habitat

Melaleuca hypericifolia occurs in damp areas of sandy heath and woodland in mostly coastal areas from Bermagui to Sydney and inland as far as the Blue Mountains.^[4] The species is naturalised in South Australia and Victoria.^[4]

Use in horticulture

Hillock bush is a hardy, adaptable and attractive shrub that has been known in gardens for many years.^[3] It is moderately frost hardy, although the flowers tend to be hidden inside the shrub.^[2] It is a dense screen plant, unless pruned to display the flowers.^[8] It has caused problems in some areas where it has spread from gardens into bushland in other states and care should be taken with the species in southern Victoria.^[9] Two cultivars have been developed:

M. hypericifolia 'Snapper Point'^[10]
M. hypericifolia 'Ulladulla Beacon'^[11]

References

^ ^a ^b "Melaleuca hypericifolia". Plants of the World Online. Retrieved 30 August 2021.
^ ^a ^b ^c Brophy, Joseph J.; Craven, Lyndley A.; Doran, John C. (2013). Melaleucas : their botany, essential oils and uses. Canberra: Australian Centre for International Agricultural Research. p. 201. ISBN 9781922137517.
^ ^a ^b ^c Holliday, Ivan (2004). Melaleucas : a field and garden guide (2nd ed.). Frenchs Forest, N.S.W.: Reed New Holland Publishers. pp. 144–145. ISBN 1876334983.
^ ^a ^b ^c ^d Wilson, Peter G. "Melaleuca hypericifolia". PlantNET - New South Wales Flora Online. Royal Botanic Gardens & Domain. Retrieved 12 May 2015.
^ "Melaleuca hypericifolia". APNI. Retrieved 23 July 2015.
^ Smith, James Edward (1797). "Botanical Characters of Some Plants of the Natural Order of Myrti.". Transactions of the Linnean Society of London. 3: 279. Retrieved 12 May 2015.
^ Robinson, Les. Field guide to the native plants of Sydney. Kangaroo Press. ISBN 9780731812110.
^ Wrigley, John W.; Fagg, Murray (1983). Australian native plants : a manual for their propagation, cultivation and use in landscaping (2 ed.). Sydney: Collins. ISBN 0002165759.
^ "Melaleuca hypericifolia". Australian Native Plant Society (Australia). Retrieved 12 May 2015.
^ "Melaleuca hypericifolia 'Snapper Point'". APNI. Retrieved 12 May 2015.
^ "Melaleuca hypericifolia 'Ulladulla Beacon'". APNI. Retrieved 12 May 2015.