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Valentine.gr  

October 2009

Did you know that some Grevillea species may cause allergic contact dermatitis to humans?

 Grevillea - Grevillea robusta

Grevillea - Grevillea spp.

Grevillea is a diverse genus of about 360 species of evergreen flowering plants in the protea family Proteaceae, native to Australia, New Guinea, New Caledonia, and Sulawesi.  The species range from prostrate shrubs less than 0.5 m tall to trees 35 m tall. Common names include Grevillea, Spider Flower, Silky-oak and Toothbrush.

Closely related to the genus Hakea, the genus gives its name to the subfamily Grevilleoideae. Many species of grevilleas are popular garden plants, especially in Australia but also in other temperate and subtropical climates. Many grevilleas have a propensity to interbreed freely, and extensive hybridisation and selection of horticulturally desirable attributes has led to the commercial release of many cultivars. Among the best known are Grevillea 'Robyn Gordon', a small shrub up to 1.5 metres high and wide which can flower 12 months of the year in subtropical climates.

The first grevilleas collected were amongst the collections made by Joseph Banks and Daniel Solander who arrived on Captain Cook’s ship the ‘Endeavour’ in Botany Bay on 28th April 1770. The genus was named in honour of Charles Francis Greville. (Charles Francis Greville was a British collector a very close friend of Sir Joseph Banks).

Many grevilleas were used by the aboriginal tribes for food. A cool drink was obtained from the roots of G. nematophylla, which often sustained them in their desert crossings. They also sucked the nectar from the flowers and made a drink by soaking the flower heads in water. A paste was made by mashing the bark of certain grevilleas and this was used to heal earache, spear wounds, skin sores and even rubbed on women’s breasts to induce lactation. These pastes were also used for tribal markings. Queensland aborigines utilised the gum of G. striata as ‘cement’ and used it to attach flints to axes and spears. Aborigines appear to have had a name for most species; these names referred mostly to their practical uses. There are over 350 species of grevillea and the number is always increasing. Grevillea australis is the only grevillea that occurs naturally in Tasmania. 

Grevillea robusta, commonly known as the southern silky oak or Silky-oak, or Australian Silver-oak, is the largest species in the genus Grevillea. It is a native of eastern coastal Australia, in riverine, subtropical and dry rainforest environments receiving more than 1,000 mm per year of average rainfall. It is a fast growing evergreen tree, between 18-35 m tall with dark green delicately dented bipinnatifid leaves reminiscent of a fern frond. It is the largest plant in the Grevillea genus, reaching diameters in excess of one metre. These leaves are generally 15-30 cm long with greyish white or rusty undersides. Its flowers are golden-orange bottlebrush-like blooms, between 8-15 cm long, in the spring, on a 2-3 cm long stem and are used for honey production. The seeds mature in late winter to early spring, fruiting on dark brown leathery dehiscent follicles, about 2 cm long, with one or two flat, winged seeds.

The flowers are edible. They are one of the richest sources of nectar. This can be sucked directly from the flowers, shaken into a bowl or washed out in a small quantity of water. The nectar falls in showers when the flowers are shaken. The plant yields small quantities of a gum resin. The leaves contain rutin, though quantities are not specified. Intense yellow and green dyes are obtained from the leaves.

This tree is one of the most important reafforestation trees in Nepal. This species is more resistant than other members of the genus to root-rotting fungus, it is sometimes used as a rootstock for the more susceptible species. Grevillea robusta (Southern Silky Oak) is also grown in plantations in South Africa. It is the best tree which can be used for fencing and it is one of the fastest growing trees.

Wood - strong, silky textured, light, easily split, durable but porous. Before the advent of aluminium, the timber from this tree was widely used for external window joinery as it is resistant to rotting. It was also popular for making furniture in Australia.

There are severe restrictions on the harvesting of this tree now as the number of trees became depleted.

Some Grevillea species may cause allergic contact dermatitis to humans. There are a number of reports in the literature of allergic contact dermatitis as a result of exposure to the sawdust and plant parts of Grevillea robusta.


Source:

http://en.wikipedia.org/wiki/Grevillea
http://www.apstas.com/grevillea1.htm
http://www.pfaf.org/database/plants.php?Grevillea+robusta
http://en.wikipedia.org/wiki/Grevillea_robusta

 

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Dove Tree - Davidia involucrata
Ashwagandha - Winter Cherry - Withania somnifera
Zabala - Lardizabala biternata
Longan - Dimocarpus longan
Flame tree - Delonix regia
Ïrchid tree - Bauhinia variegata
Pink Lapacho - Handroanthus impetiginosus
African peach - Nauclea latifolia
Golden Himalayan raspberry - Rubus ellipticus
Flame Thrower Palm - Chambeyronia macrocarpa
Toothbrush tree - Mustard tree - Salvadora persica
Monastery bamboo - Thyrsostachys siamensis
Nara - Desert melon - Acanthosicyos horridus
Candelabra tree - Euphorbia ingens
Shea butter tree - Vitellaria paradoxa
Tejocote - Mexican hawthorn - Crataegus mexicana
Tree of Damocles - Oroxylum indicum
Talipot palm - Corypha umbraculifera
Albany pitcher plant - Cephalotus follicularis
Nipa palm - Nypa fruticans
Marmalade Box - Genipa americana
Ice Cream Bean - Inga edulis
Gular - Cluster fig - Ficus racemosa
Kei apple - Dovyalis caffra
Stork's Bill - Erodium cicutarium
Camu Camu - Myrciaria dubia
Pemphis - Pemphis acidula
Sisal - Agave sisalana
Jute Mallow - Corchorus olitorius
Sugar Apple - Annona squamosa
Sapodilla - Manilkara zapota
Black Sapote - Diospyros nigra
Star Apple - Chrysophyllum cainito
White Ginger Lily - Hedychium coronarium
Yuzu - Citrus junos
Wild Loquat - Sugar Plum - Uapaca kirkiana
Tonka - Cumaru - Dipteryx odorata
Chinese bayberry - Myrica rubra
Wood Apple - Limonia acidissima
Açaí - Euterpe oleracea
Tindola - Ivy gourd - Coccinia grandis
Blue honeysuckle - Haskap - Lonicera caerulea
Balata - Manilkara bidentata
Calabash nutmeg - Monodora myristica
Allanblackia
Kola nut - Cola nitida
Rainbow eucalyptus - Eucalyptus deglupta
Elephant apple - Dillenia indica
Australian Christmas tree - Nuytsia floribunda
Honeywort- Cerinthe major
Aconite - Monkshood - Wolfsbane - Aconitum napellus
Crown of Thorns - Euphorbia milii
Abyssinian banana - Ensete ventricosum
Goldenrain Tree - Koelreuteria paniculata
Naranjilla - Lulo - Solanum quitoense
Brazil nut tree - Bertholletia excelsa
Sea grape - Coccoloba uvifera
Bignay - Antidesma bunius
Cashew - Anacardium occidentale
Giant Himalayan Lily - Cardiocrinum giganteum
African Hemp - Sparrmannia africana
Lychee - Litchi chinensis
Prickly Heath - Gaultheria mucronata
Hoodia - Bushman's hat - Hoodia gordonii
Cannibals Tomato - Solanum viride
Ashoka - Saraca asoca
Ackee - Blighia sapida
African plum - Safou - Dacryodes edulis
Solandra - Solandra maxima
Stapelia - Stapelia gigantea
Foxglove - Digitalis purpurea
Swiss Cheese Plant - Monstera deliciosa
Chocolate flower - Berlandiera lyrata
Sandersonia - Sandersonia aurantiaca
Northern Japanese Magnolia - Magnolia kobus
Champak - Magnolia champaca
Hooker’s lips - Psychotria elata
Suicide Tree - Cerbera odollam
Konjac - Amorphophallus konjac
Madagascar ocotillo - Alluaudia procera
Water Banana - Typhonodorum lindleyanum
Salak - Salacca zalacca
Natal Plum - Carissa macrocarpa
Ashanti blood - Mussaenda erythrophylla
Duranta - Duranta erecta
Maqui - Aristotelia chilensis
Manuka - New Zealand Tea Tree - Leptospermum scoparium
Suriname cherry - Eugenia uniflora
Australian Finger Lime - Citrus australasica
Sacred Flower of the Incas - Cantua buxifolia
Job's tears - Coix Lacryma-jobi
Velvet Bean - Mucuna pruriens
Java Apple - Syzygium samarangense
Screwpine - Pandanus utilis
Marimo - Aegagropila linnaei
Achocha/Caigua - Inca cucumber - Cyclanthera pedata
Rubber Tree - Hevea brasiliensis
Sugar cane - Saccharum officinarum
Sacha inchi - Plukenetia volubilis
Coffea - Coffee Tree - Coffea arabica
Liquorice - Licorice - Glycyrrhiza glabra
Mullein -Verbascum thapsus
Iceplant - Mesembryanthemum crystallinum
Chayote - Sechium edule
Roselle - Hibiscus sabdariffa
Black Goji - Lycium ruthenicum Murray
Rose Cactus - Pereskia grandifolia
Durian - Durio zibethinus
Jackfruit tree - Artocarpus heterophyllus
Cassabanana - Sicana odorifera
Chilean myrtle - Arrayan - Luma apiculata
Kurrajong - Brachychiton populneus
Rice-paper Plant -Tetrapanax papyrifer
Shell Ginger - Alpinia zerumbet
Harlequin Glorybower - Clerodendrum trichotomum
Coco de Mer - Lodoicea maldivica
Silver Tree - Leucadendron argenteum
Buffaloberry - Shepherdia argentea
Himalayan Honeysuckle - Leycesteria formosa
Raisin Tree - Hovenia dulcis
Borojo - Alibertia patinoi - Borojoa patinoi
Butterfly Pea - Clitoria ternatea
Honey Flower - Melianthus major
Ombu - Phytolacca dioica
Lion's Ear - Wild Dagga - Leonotis leonurus
Moringa - Miracle Tree - Moringa oleifera
Sea Daffodil - Pancratium maritimum
Spear Lily - Gymea - Doryanthes
Camphor tree - Cinnamomum camphora
Waterwheel - Aldrovanda vesiculosa
Flowering rush - Butomus umbellatus
Four o'clock - Marvel of Peru - Mirabilis jalapa
Dead Man’s Fingers - Decaisnea
Bitter Melon - Momordica charantia
Shoapnuts Tree - Shoapberry - Sapindus
Acerola - Malpighia
Monkey Ladder - Sea Heart - Entada gigas
Cherimoya - Annona cherimola
Caper - Capparis spinosa
Lithops - Living Stones
Chaste Tree - Vitex agnus-castus
Chilean Lantern Tree - Crinodendron hookerianum
Parrot's Beak - Lotus berthelotii
Water Hyacinth - Eichhornia crassipes
Guaiac Tree - Guaiacum officinale - Lignum-vitae
Mickey Mouse bush - Ochna serrulata
Cow's Udder - Solanum mammosum
Miracle fruit - Synsepalum dulcificum
Akebia - Akebia quinata
Chilean Firebush - Embothrium coccineum
Caesalpinia - Caesalpinia pulcherrima
Welwitschia - Welwitschia mirabilis
Saguaro - Carnegiea gigantea
Schisandra - Schisandra chinensis
Monarda - Bee balm - Bergamot
Tamarind - Tamarindus indica
Neomarica - Walking Iris
Red hot poker - Kniphofia - Tritoma
Sikkim rhubarb - Rheum nobile
Reseda - Mignonette
Paulownia - Paulownia tomentosa
Belamcanda chinensis - Leopard lily
Blue Poppy - Meconopsis
Cannonball Tree - Couroupita guianensis
Tamarillo - Cyphomandra betacea
Goji - Wolfberry - Lycium barbarum
Vanilla - Vanilla Planifolia
Stevia - Stevia rebaudiana
Pachypodium
Physalis
Ceropegia
Sturt pea - Swainsona formosa
Clematis
Grevillea
Jade vine - Strongylodon macrobotrys
Sansevieria - Snake Plant
Trochetia
Yareta - Azorella compacta
African tulip tree - Spathodea campanulata
Angel's Trumpets - Brugmansia
Achiote - Annato - Bixa orellana
Sausage Tree - Kigelia pinnata
Castor Oil Plant - Ricinus communis
Firewheel Tree - Stenocarpus sinuatus
Bat Flower - Tacca
Snake gourd - Trichosanthes cucumerina
Sedum
Hydnora - Hydnora africana
Pickerel Weed - Pontederia
Argan - Argania spinosa
Astilbe - False Goats Beard
Feijoa - Pineapple Guava - Acca sellowiana
Aquilegia - Columbine
Cassiope
Sweet Box - Sarcococca
Christmas Cactus - Schlumbergera
Foxtail Lily - Eremurus
Rue - Ruta graveolens
Pittosporum
Ylang-Ylang - Cananga odorata
Rose of Jericho - Anastatica hierochuntica
Gunnera
Waterlily - Nymphaea
Calico Flower - Aristolochia
Daylily - Hemerocallis
Contorted hazel - Corylus avellana Contorta
Torch Ginger - Etlingera elatior
Mistletoe - Viscum album
Devil´s claw - Harpagophytum procumbens
Teasel - Dipsacus
Pampas grass - Gynerium argenteum - Cortaderia Selloanna
Purple coneflower - Echinacea purpurea
Coral Tree - Erythrina crista-galli
Portulaca
Lobelia
Field Poppy - Papaver Rhoeas
Narcissus - Daffodil
Mimosa pudica - Sensitive Plant
Boxwood - Buxus sempervirens
Firethorn - Pyracantha
Star of Bethlehem - Ornithogalum
Cosmos
Muscari - Grape Hyacinth
Papyrus - Cyperus papyrus
Zinnia
Honeysuckle - Lonicera
Passiflora - Passion Flower
Calendula - Marigold
Lupine - Lupinus
Canna - Indian Shot
Witch Hazel - Hamamelis
Oak - Quercus
Brunsvigia - Candelabra Flower
Tree peony - Paeonia suffruticosa
Olive - Olea europaea
Cornflower - Centaurea cyanus
Desert rose - Adenium obesum
Oleander - Nerium Oleander
Abutilon
Sweet Pea - Lathyrus odoratus
Chaenomeles - Flowering Quince
Forsythia
Amaryllis - Hippeastrum
Butchers broom - Ruscus aculeatus
Bay Laurel - Laurus nobilis
Gloriosa
Bamboo
Gladiolus
Artichoke - Cynara scolymus
Clivia - Clivia Miniata
Dipladenia - Dipladenia sanderii
Date palm - Phoenix dactylifera
Peach - Prunus persica
Almond - Prunus amygdalus
Willow - Salix
Pomegranate - Punica granatum
Protea cynaroides
Colchicum autumnale
Bird of Paradise - Strelitzia reginae
Cardon - Pachycereus pringlei
Wolffia arrhiza
Puya raimondii
Fuchsia
Asphodelus - Asphodel
Primula - Primerose
Dicentra spectabilis - Bleeding Heart
Edelweiss - Leontopodium alpinum
Helleborus Niger - Christmas Rose
Zantedeschia - Calla Lily
Fritillaria imperialis - Crown imperial
Aster
Heliconia
Common Sunflower - Helianthus annuus
Bee Orchid - Orphys apifera
Convalaria majalis - Lily of the Valley - Muguet
Syringa Vurgaris - Lilac
Viola
Impantiens
Snowdrop - Galanthus
Poinsettia - Euphorbia pulcherrima
Dionaea muscipula
Banksia
Sea anemone
Amorrhophallus titanum
Rafflesia arnoldi

 

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