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Valentine.gr  

July 2014

Did you know that Silver Tree (Leucadendron argenteum) has been called "living chrome" because of its shiny, silvery foliage that looks metallic and feels like silk?

Silver Tree (Leucadendron argenteum). Leaves and flowers

Silver Tree - Leucadendron argenteum

Leucadendron argenteum (Silver tree, Silver leaf tree, Afrikaans: Witteboom, or Silwerboom) is an endangered species in the family Proteaceae, endemic only to Table Mountain, a small area of the Cape Peninsula, in and around the city of Cape Town, South Africa. The Silver Tree is a protected tree in South Africa.

The name Leucadendron is from the Greek, leukos, meaning white, and dendron, tree. This genus is named after and based on the silver tree, from its common name witteboom, meaning white tree, as it was known in the 1690s when the genus was first named. The species name argenteum is Latin and means silver, silvery or ornamented with silver, referring to its striking silver foliage. It's been called "living chrome" because of its shiny, silvery foliage that looks metallic and feels like silk!

The Silvertree is a striking evergreen tree, growing 5–7 m tall (sometimes up to 16 m). It is erect and well-proportioned with a thick, straight trunk and grey bark. The soft, silky leaves are shiny silver, lanceolate, 8–15 cm long and 2 cm broad, with their distinct silvery sheen produced by dense velvety hairs which help keep the leaves from drying out. In warmer weather, the hairs lie flat, reflecting the sun's light.  The wind-pollinated (or beetle-pollinated) flowers are produced in dense globose inflorescences 4–5 cm diameter, they are apricot-coloredand give off a pleasant vanilla scent which attracts the small beetles that do the job of pollination. Like all Leucadendrons, this tree is dioecious, with separate male and female plants. The fruit is a heavy woody cone, containing numerous seeds; each seed is a small nut with a silky-haired helicopter-like parachute, enabling it to disperse by wind.

This enormous silver Protea is naturally confined to a tiny area in and around the city of Cape Town. Its main population grows on the slopes of Table Mountain, notably the Lion's Head area, above Rhodes Memorial and the mountain slopes above Kirstenbosch National Botanical Garden. In addition there are two tiny outlying populations nearby, in Stellenbosch and Paarl (It has not yet been established for certain whether these are natural outliers, or were planted here in early Cape history). Historically, the Silvertree was more widespread on Table Mountain, covering much of its slopes in shimmering silver forests. However, early demand for timber led to much of these forests being felled and now the Silvertree is a rare and endangered species. Table Mountain might be the only place where these trees grow naturally in the wild (there is controversy about whether the populations in Stellenbosch and Paarl were introduced from Table Mountain). In the face of urban development, inappropriate fire management, and invasive alien trees such as pines and gums, silvertrees have been driven from about 74% of their natural range.

Within the remaining habitat, an estimated 40 to 50 percent of the entire world's native population of these trees was destroyed between 26 January and 27 January in the 2006 Table Mountain fire. However, as recruitment of seedlings only occurs naturally after fire this is a necessary stage in the life-cycle of this Fynbos species. Recruitment after the fire has been good, and the population has recovered totally.

A major deterrent to propagation of the silver leaf tree is its short life span. Most individuals don't live more than 20 years. But that is not a problem for conservation as fires rejuvenate populations on average every 15–20 years.

To survive in the fire-prone fynbos, Leucadendron argenteum has evolved the reseeding strategy. Despite its thick bark, adult trees are usually killed by fire and only the seeds survive. The seeds are kept safe in the large woody cones on the plant and are released en masse after a fire. A small percentage of the seeds are released during the lifetime of the tree, which keeps the population healthy by producing a steady supply of young plants in the absence of fire. Juveniles take 5–7 years to flower and set seed, whereafter the populations are ready to burn again.

Seeds are dispersed by wind. Although the seeds are large, relatively heavy nuts, they are equipped with a plumed parachute-like appendage, the dried remains of the flower, which carries it a considerable distance from its parent plant. The seeds are also eaten by rodents, which collect and store the seeds in underground caches where many remain uneaten, and viable for many decades. Seeds have been known to survive in the soil for 80 years. The alien grey squirrels also eat the seeds, taking them from cones as they are opening.

Leucadendron argenteum is widely cultivated as an ornamental garden specimen. Its beautiful silver foliage is used in floristry and lasts well in the vase. The leaves have also long been collected, pressed and dried for decoration or as a souvenir. The dried female cones are decorative and the small silver balls of the dried male flower heads are used in dried floral arts and crafts, e.g. to make the body of mice or hedgehogs. In the 1600s and 1700s L. argenteum was extensively used as firewood.

The Silver Tree is challenging to grow, but in the right conditions it's a spectacular plant that is rarely seen in cultivation. The Silver Tree comes from a mild, maritime climate and does best with moderate temperatures.It can only take a few degrees of frost. It's best to protect it from all frost. You may grow it in large pot indoors, provided that it receives good air circulation. It needs fast draining soil that's slightly acid and low in nutrients. Like most Protea relatives, it dislikes phosphorous fertilizer. Give it full sun, and regular watering during the growing season. The plant is prone to Phytophora root rot, especially if overwatered in warm weather. Be gentle whenever repotting, as it dislikes root disturbances.

Source:
http://en.wikipedia.org/wiki/Leucadendron_argenteum
http://www.plantzafrica.com/plantklm/leucadadendronargent.htm
http://www.strangewonderfulthings.com/208.htm

 

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Green birdflower - Crotalaria cunninghamii
Akar Kuning - Fibraurea tinctoria
Indian plum - Flacourtia jangomas
Apple of Sodom - Calotropis procera
Silver Vine - Actinidia polygama
Yerba Mansa - Anemopsis californica
Tree of Death - Manchineel - Hippomane mancinella
Dove Tree - Davidia involucrata
Ashwagandha - Winter Cherry - Withania somnifera
Zabala - Lardizabala biternata
Longan - Dimocarpus longan
Flame tree - Delonix regia
Ďrchid 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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