Grevillea alpina is a species of flowering plant in the family Proteaceae. It has several common names, including mountain grevillea, alpine grevillea, and cat's claws. It is endemic to Australia. 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 centimetres (0.39 to 1.18 in) in length. It is attractive to nectar-feeding insects and birds.
Description
There is considerable variation in the form, leaves and flowers of the species. Plants are between 0.3 and 2 metres (0.98 and 6.56 ft) in height. The leaves may be linear, oblong or elliptic and are generally between 0.5 and 2 centimetres (0.20 and 0.79 in) long and 1.5 to 4 millimetres (0.059 to 0.157 in) wide. Both surfaces of leaves may or may not have hairs. The leaf edges may be curved backwards or revolute.[2]
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.[3] The flowers are followed by hairy, leathery, ovoid fruits (follicles) that are between 8.5 and 12 millimetres (0.33 and 0.47 in) long.[4] These split open, releasing winged seeds.[3]
Taxonomy
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.[5]
In the Flora of Australia (1999), the species was positioned within the genus Grevillea by means of a hierarchical tree as follows:
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.[6] 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:
The Grampians form, the type form with bright orange and yellow flowers
The small-flowered form found in Beechworth, Chiltern, Albury and Canberra.[6] Plants from Tooborac were also classified as this form, but the authors currently believe they may constitute a separate form.[7]
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.[9]
The species was first introduced to cultivation in England in 1856 and by 1858 was in cultivation at the Royal Botanic Gardens, Melbourne.[6] 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.[6]
Plants are readily propagated from pre-treated seed, though seed sourced from gardens often leads to hybrid progeny.[6] 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.[10]
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.[11]
^"Grevillea alpina". Images from the Box-Ironbark Forests. La Trobe University, Bendigo. Archived from the original on 7 September 2012. Retrieved 14 June 2011.
^"Grevillea alpina". Australian Native Plants Society (Australia). Retrieved 13 June 2011.
^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.
