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Grevillea alpina

The Australian flowering shrub Grevillea alpina has several common names, including mountain grevillea, alpine grevillea, and cat's claws. It is not limited to alpine environments, and in fact is less common at high elevation than low. The species is variable in appearance, with five general forms described: small-flowered, Grampians, Northern Victorian, Goldfields, and Southern Hills forms. It is found in dry forests and woodlands across Victoria and into southern New South Wales. Some forms of the plant are low to the ground, and some become a spreading shrub. The flowers come in many colours, from white to green to shades of red and pink, or a pattern of several colours. The curled flowers are 1 to 3 centimeters in length. It is attractive to nectar-feeding insects and birds.

Description[edit]

There is considerable variation in the form, leaves and flowers of the species. Plants are between 0.3 and 2 metres in height. The leaves may be linear, oblong or elliptic and are generally between 0.5 to 2 cm long and 1.5 to 4 mm wide. Both surfaces of leaves may or may not have hairs. The leaf edges may be curved backwards or revolute.[1] Flower colour is one of the most variable characteristics. The main colour of the perianth may be red, orange or pink or more rarely yellow or cream. There is often a transition of colour along the length of the perianth leading to commonly seen red-yellow or red-cream combinations. The main months of flowering are from August to December in the species native range.[2] The flowers are followed by hairy, leathery, ovoid fruits (follicles) that are between 8.5 and 12 mm long.[3] These split open, releasing winged seeds.[2]

Taxonomy[edit]

The species was first formally described in 1838 by English botanist John Lindley in Three expeditions into the interior of Australia. This description was based on plant material collected from Mount William in the Grampians during Thomas Mitchell's expedition in 1836.[4]

In the Flora of Australia (1999), the species was positioned within the genus Grevillea by means of a hierarchical tree as follows:

Grevillea (genus)

Floribunda Group
Floribunda Subgroup
Grevillea floribunda
Grevillea polybractea
Grevillea chrysophaea
Grevillea celata
Grevillea alpina
Grevillea mucronulata
Grevillea kedumbensis
Grevillea granulifera
Grevillea guthrieana
Grevillea obtusiflora

Distribution[edit]

Grevillea alpina is widespread in Victoria extending from Melbourne northwards into New South Wales through Albury and as far north as Canberra where it is found on Black Mountain. Its westernmost extent is found in the Grampians in Victoria.[5] It occurs in woodland, heathland and mallee.

In The Grevillea Book published in 1995, the authors Peter Olde and Neil Marriott identified five informal forms:

Naturally occurring hybrids have been recorded with G. lavandulacea.G. dryophylla and G. obtecta.[4] In New Zealand, hybrids with Grevillea rosmarinifolia have become naturalised.[7]

Ecology[edit]

Honeyeaters are believed to be the major pollinators. Honey bees have been observed feeding on the nectar, but are able to do so without touching the pollen presenter.[8]

Cultivation[edit]

The species was first introduced to cultivation in England in 1856 and by 1858 was in cultivation at the Royal Botanic Gardens, Melbourne.[5] Though widely grown, it has a reputation for being short lived. This problem, which is accentuated in humid climates with summer rainfall, has been addressed by grafting on various rootstocks. G. alpina grows best in dry environments and does not tolerate excess moisture well. Regular pruning from a young age will encourage denser growth and reduce woodiness.[5]

Plants are readily propagated from pre-treated seed, though seed sourced from gardens often leads to hybrid progeny.[5] The species hybridises readily with Grevillea rosmarinifolia, Grevillea juniperina and Grevillea lavandulacea. The use of cuttings is the preferred method of propagation for assuring that particular forms and cultivars are true to type.[9]

In 2003, it was reported that the fungal disease Phytophthora palmivora had been detected in plant nurseries in Sicily, leading to root rot and death of potted Grevillea cultivars. Of these plants of Grevillea alpina were the most severely affected.[10]

Cultivars[edit]

A large number of hybrid cultivars and selected forms have been introduced to horticulture including:

Numerous naturally occurring forms have been named after the locality from which they originate including Albury, Axedale, Bendigo, Black Mountain, Castlemaine, Chiltern, Grampians, Greta West, Kinglake, Lerderderg Gorge, Morrl Morrl, Mt Dandenong, Mt Ida, Mt Pleasant, Mt Slide, Mt Zero, Murphys Hill, One Tree Hill, Porcupine Ridge, Pyalong, Reef Hills, Rushworth, Seymour, South Mandurang, St Arnaud, Strathbogies, Tallarook, Tamminack Gap, Tawonga Gap, Tooborac, Warby Range, Whorouly and Wombat State Forest.[4]

References[edit]

  1. ^ McGillivray, D.J. assisted by R.O. Makinson (1993). Grevillea, Proteaceae: a taxonomic revision. Carlton, Victoria: Melbourne University Press. ISBN 0522844391. 
  2. ^ a b Wild Plants of Victoria (database). Viridans Biological Databases & Department of Sustainability and Environment. 2009. 
  3. ^ "Grevillea alpina". Flora of Australia Online. Department of the Environment and Heritage, Australian Government. 
  4. ^ a b c "Grevillea alpina". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government, Canberra. Retrieved 11 June 2011. 
  5. ^ a b c d e Olde, P. and Marriott, N. (1995). The Grevillea Book. Australia: Kangaroo Press. ISBN 0-86417-616-3. 
  6. ^ Marriott, Neil (February 2012). "Grevillea alpine Grevillea Crawl 2011" (PDF). Grevillea Study Group newsletter (91): 3. ISSN 0725-8755. Retrieved 1 May 2012. 
  7. ^ Howell, Clayson; John W.D. Sawyer (November 2006). "New Zealand Naturalised Vascular Plant Checklist". New Zealand Plant Conservation Network. Retrieved 14 June 2011. 
  8. ^ "Grevillea alpina". Images from the Box-Ironbark Forests. La Trobe University, Bendigo. Retrieved 14 June 2011. 
  9. ^ "Grevillea alpina". Australian Native Plants Society (Australia). Retrieved 13 June 2011. 
  10. ^ Cacciola, S.A. et al (2003). "First Report of Phytophthora palmivora on Grevillea spp. in Italy". plant disease 87 (8): 1006. doi:10.1094/PDIS.2003.87.8.1006A. 
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